Compare foldables on two separate axes: endurance in the same controlled test and the amount of charge they add in the same time. Battery capacity is useful context, but it cannot predict which phone lasts longer. Screen size, processor, modem conditions, software, brightness and workload all matter.
Charging deserves the same discipline. “Fast charging” is not a result until you know the starting percentage, elapsed time, adapter, protocol, cable and temperature. A phone with shorter test endurance may still suit you better if it can recover most of a day’s practical use during a short break.
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What a fair foldable-battery comparison looks like
A useful comparison answers two different questions:
- How long does the phone run? Use a repeatable endurance test with the same workload, brightness, network conditions and active display.
- How quickly can it recover? Compare the percentage gained after a stated interval, such as 15 or 30 minutes, from a stated starting level with a specified charger and protocol.
Do not merge these into one score. A phone can last longer in a continuous test yet recharge more slowly, while another can deliver a large top-up during a short break but have shorter total endurance. Decide which trade-off matches your routine instead of treating one headline number as the winner.
#1 Best Overall
- SPLIT THE VIEW. MULTITASK¹ TO THE MAX: Productivity never felt this powerful. Use up to three apps¹ at once on the expansive inner screen of Galaxy Z Fold8 Ultra. You’ll enjoy plenty of space to work, play, connect and more.
- MULTITASKING MADE SMARTER WITH AI: Stay one step ahead with AI² that suggests which apps you might need next. Then view those multiple windows side by side on the large screen of your Galaxy Z Fold8 Ultra.
- ANY SHOT, ALL THE DETAILS: Dive into the details of any image with our best camera on a foldable smartphone. Galaxy Z Fold8 Ultra boasts a 200MP camera — and an upgraded 50MP Ultra Wide lens — for both stunning wide shots and extreme close-ups.
- ELITE CHIPSET. FLUID GRAPHICS: Experience what’s possible with our most advanced Galaxy Z Series processor. From immersive gaming and speedy multitasking to the latest Galaxy AI³ features, the Snapdragon 8 Elite Gen 5 keeps everything running seamlessly.
- THE BATTERY YOU’VE BEEN WAITING FOR: It’s the battery you’ve been wanting in a foldable cell phone. Galaxy Z Fold8 Ultra packs a powerful ultra-sized⁴ battery in an ultra-slim design. Plus, with Super Fast Charging 2.0⁵, charge up faster than ever before.
Foldables make the comparison harder because they have at least two screens. A notebook-style test that keeps the large inner panel on measures a demanding scenario. Cover-screen use, mixed folding and unfolding, standby time and app-specific behavior can produce different results. A test should state which panel was active, how often the hinge was opened, and whether the device was allowed to sleep between tasks.
Build a like-for-like scorecard
For each candidate, keep separate rows for inner-screen endurance, cover-screen or mixed-use observations, wired recovery at 15 and 30 minutes, and wireless charging support. Add the test date and software version. This prevents a manufacturer’s ordinary-hours estimate from being mixed into a reviewer’s continuous screen-on result.
Also record what is not known. If a charging table does not identify the adapter, starting level or cable, mark the result as incomplete rather than implying laboratory precision. Transparency about missing conditions is more useful than a false ranking.
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Check the workload and display
Tom’s Guide says its notebook-style foldable test continuously surfs the web with the larger main display active. That method is valuable because it applies the same workload across models, but it is not a promise of the hours every owner will see. Streaming video, gaming, camera recording, navigation and frequent use of the cover screen load the phone differently.
Web browsing also has a distinctive rhythm: the screen stays on, pages load repeatedly and the radio works at intervals. It does not represent an owner who reads downloaded documents, takes photos, plays a demanding game, or leaves the phone closed in a pocket for several hours. Use the test to compare models under that method, then adjust for your own screen mix.
Check brightness, connectivity and software
Brightness, cellular signal strength, Wi-Fi, 5G use, background synchronization and software versions can materially change run time. A weak signal makes the modem work harder; high brightness increases display consumption; a new software build may alter power management. A result is only directly comparable when these conditions are held reasonably constant.
Look for a stated brightness level or an automated brightness setting. Automatic brightness can react differently to the same room and may make two runs less comparable. Likewise, Wi-Fi-only browsing and a 5G browsing run answer different questions. A phone moving between towers may consume more than one connected to stable Wi-Fi, even when the visible workload is identical.
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Look for the starting battery percentage, whether the phone was freshly configured or restored from a backup, and the endpoint used by the tester. “Continuous web-surfing time” is not the same metric as a manufacturer’s “hours of battery life” estimate or an ordinary-hours claim.
Battery percentage is an estimate, not a direct measure of remaining energy. Two phones can display the same percentage while having different usable capacity, temperature or power curves. That is another reason to compare complete test runs rather than converting a single percentage into a predicted number of hours.
Consider repeatability
One run can be affected by indexing, app updates, account synchronization or heat left over from setup. Strong comparisons repeat the procedure or explain why a single run is being reported. If you test at home, charge both phones to the same level, let them reach room temperature, close unrelated apps and begin at the same time. Note any interruptions, because a phone that sleeps between checks is not undergoing the same stress as one with the display continuously active.
Published test example: endurance and 30-minute charging
The following figures come from Tom’s Guide’s 2026 continuous web-surfing test. Notebook-style foldables were tested with the larger main display. The charge column records the gain after 30 minutes; the report does not establish that every model used an identical adapter or charging setup, so treat it as an observed comparison rather than a universal ranking.
| Foldable | Continuous web-surfing endurance | Charge after 30 minutes | What the result tells you |
|---|---|---|---|
| Razr Fold | 14 hours 44 minutes | 75% | Longest endurance in this four-phone test; also a substantial half-hour recovery. |
| Pixel 10 Pro Fold | 12 hours 16 minutes | 58% | Middle of the endurance ranking in this test; its charge gain was lower than the Razr Fold and OnePlus Open. |
| Galaxy Z Fold7 | 10 hours 55 minutes | 54% | Shortest endurance and smallest reported 30-minute gain among these four results. |
| OnePlus Open | 11 hours 45 minutes | 85% | Near the bottom on endurance but the fastest 30-minute recovery in this report. |
The table demonstrates why “best battery” is an incomplete label. The Razr Fold led the endurance test, while the OnePlus Open led the 30-minute charge result. Neither result predicts every owner’s day because personal screen mix, signal, brightness and applications differ from the test.
Notice that the charge figures are gains after 30 minutes, not claims that the battery reached those percentages from empty. A gain of 85% could mean a different ending level than a gain of 54%, depending on the starting point. Without a common adapter and starting level, use the column to understand the publication’s observed recovery, not to calculate a universal charging speed.
Rank #2
- 7.6", Foldable OLED, 120Hz, HDR10+, 1000 nits (HBM), 1450 nits (peak), 1840 x 2208 pixels, Cover display: 5.8" OLED, 120Hz, HDR,1080 x 2092 pixels, 17.4:9 ratio, 408ppi, 1200 nits (HBM), 1550 nits (peak)
- 256GB 12GB RAM, Octa-core, Google Tensor G2 (5nm), Mali-G710 MP7, Android 13, upgradable to Android 14, 4821mAh Battery, IPX8 water resistant
- Rear Camera: 48MP, f/1.7 + 10.8MP, f/3.1 (telephoto) + 10.8MP, f/2.2 (ultrawide), Front Camera: 8MP, f/2.0, Cover camera: 9.5MP, f/2.2
- 2G: GSM 850/900/1800/1900, CDMA 800/1700/1900, 3G: HSDPA 800/850/900/1700(AWS)/1900/2100, CDMA2000 1xEV-DO, 4G LTE: 1/2/3/4/5/7/8/12/13/14/17/18/19/20/25/26/28/29/30/38/39/40/41/42/46/48/66/71 5G: 1/2/3/5/7/8/12/14/20/25/28/30/38/40/41/48/66/71/77/78/79/257/258/260/261 SA/NSA/Sub6 - Nano-SIM and eSIM
- Unlocked for freedom to choose your carrier. Compatible with both GSM & CDMA networks. The phone is unlocked to work with all GSM Carriers & CDMA Carriers Including AT&T, T-Mobile, Verizon, Sprint., Etc.
The four figures also show why endurance and recovery should be plotted separately. If you rarely have an outlet, the 14-hour-44-minute result may matter most. If you regularly have only a short stop between meetings, the 85% reported gain may be more valuable, even though the same phone ranked below the leader in continuous endurance.
Why battery capacity does not decide the winner
Capacity, measured in milliampere-hours, describes how much charge the battery can store under its rated conditions. It does not describe how efficiently the phone turns that charge into screen time. A larger number can be helpful, but it is not a forecast of elapsed runtime.
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- The processor and display refresh behavior determine how much power each task consumes.
- The modem may draw considerably more power in weak cellular coverage or during sustained 5G use.
- Large inner displays generally consume more power than a smaller cover display at comparable brightness.
- Camera processing, gaming, navigation, heat and background synchronization can dominate consumption.
- Software can limit background activity or shift performance to extend endurance.
In Tom’s Guide’s test, the Pixel 10 Pro Fold ran for 12 hours 16 minutes with a 5,015mAh-class battery, while the Galaxy Z Fold7 ran for 10 hours 55 minutes with a 4,400mAh battery. That is evidence that capacity alone cannot rank phones; it is not proof that the Pixel will always outlast the Samsung in every workload.
Capacity figures can also be presented differently. Google lists a typical capacity for the Pixel, while Samsung’s specification sheet lists 4,400mAh for the Z Fold7. “Typical” and rated or nominal values should not be treated as identical laboratory terms. Keep the label used by the manufacturer, and avoid dividing one phone’s capacity by another as if the resulting ratio were a guaranteed runtime ratio.
Official specifications versus independent results
Manufacturer figures provide useful information about capacity and intended charging equipment, but they use the maker’s own test assumptions. Keep them separate from an independent continuous-use result.
| Model | Published capacity | Manufacturer battery statement | Wired charging guidance | Wireless charging information |
|---|---|---|---|---|
| Pixel 10 Pro Fold | 5,015mAh typical capacity | Google lists 24+ hours on its current specification page. A Google announcement dated Aug. 20, 2025 says up to 30+ hours. These are Google claims, not the Tom’s Guide test. | About 50% in 30 minutes with a 30W USB-C PPS charger or higher. The charger is sold separately. | Qi2-certified wireless charging up to 15W. |
| Galaxy Z Fold7 | 4,400mAh | No directly equivalent hour figure is established here. | Samsung lists Super Fast Charging. Its support guidance identifies approved 25W and 45W adapters and says the phone selects the fastest available rate according to the connected charger and battery status. | Qi compatible, with Fast Wireless Charging 2.0 and Wireless PowerShare. |
Google’s Aug. 20, 2025 announcement quotes Jeff Evans, Product Manager, describing the Pixel as having “our biggest battery on a foldable device yet” and “a battery life of up to 30+ hours.” That wording is a product claim, not a replacement for a controlled, independently timed endurance result.
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Samsung’s specification sheet cited for the Z Fold7 was current as of July 9, 2025. Specifications and accessory compatibility can change, so verify the current support page for the exact regional model before buying a charger. Regional packaging can also differ, so do not assume that an adapter listed on a support page is included with the phone.
How to compare wired charging correctly
Use the same time window
Compare a 15-minute or 30-minute gain, rather than vague descriptions such as “fast charging.” Charging is not linear: the phone often accepts power quickly at a low state of charge and tapers as the battery fills. A 30-minute result from 10% is therefore not equivalent to a 30-minute result from 60%.
If your real routine is a quick departure charge, 15 minutes may be the more useful interval. If you work near an outlet for lunch, 30 minutes may better represent your opportunity. Report both when possible, but never present a 15-minute gain as if it were a half-hour result.
Record the starting percentage
Write down the battery level before connecting the cable. For a repeatable comparison, use the same starting level for every phone, allow the handset to cool, and avoid using it during the interval. State whether the reported number is the percentage added or the ending percentage.
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Identify the charger and protocol
Record the adapter’s wattage, USB-C Power Delivery or PPS support, cable, and whether the adapter was supplied in the box. A higher-wattage adapter does not guarantee a higher phone input if the handset does not support the required protocol. Google specifies a 30W USB-C PPS charger or higher for the Pixel 10 Pro Fold’s stated 50%-in-30-minutes performance and says that charger is sold separately. Samsung identifies approved 25W and 45W adapters for the Z Fold7 and lets the phone negotiate the fastest available rate.
The cable matters when it limits the negotiated profile or is damaged. A wall adapter rated above the phone’s requirement may still charge at a lower rate if it lacks USB-C PPS or another required profile. Conversely, buying the highest-wattage adapter available does not guarantee faster charging than the phone’s own ceiling.
Rank #3
- CREATED FOR YOUR CONTENT: Any way you turn it, the new Galaxy Z Fold8 gives you a fuller viewing experience. Designed with your content in mind, this foldable phone is the perfect size to make your movies, books and more incredibly immersive.
- WORLD’S LIGHTEST FOLD¹: Galaxy Z Fold8 is the newest foldable phone for content on the go. Unfolded, it fits movies and books for an immersive experience. Folded, it delivers comfortable texting and everyday use — all on the world’s lightest fold.¹
- THE BRIGHTEST DISPLAY ON A GALAXY PHONE: Our brightest smartphone display² provides you with a comfortable view, whether you’re inside or outside. Watch movies, play games and scroll with ease no matter where you are.
- RECORD. REFRAME. READY FOR SOCIAL³: Record content on Galaxy Z Fold8 and then use My FanCam³ to keep your subject center stage. The result is a social-ready video that focuses on the part of the action you really want.
- UNTETHER YOUR ENTERTAINMENT: The long-lasting battery of Galaxy Z Fold8 is built to power hours of entertainment. And when you do need to recharge, Super Fast Charging 2.0⁴ gets you back to what you love quickly.
Separate a manufacturer claim from a measured result
“About 50% in 30 minutes” is a manufacturer condition tied to a specified charger. A reviewer’s measured percentage is an observation under that reviewer’s temperature, starting level, cable and software conditions. Label the source and conditions instead of treating the two figures as interchangeable.
Account for heat and tapering
Charging can slow when the phone is hot, when it is being used heavily, or as the battery approaches a high state of charge. A test performed immediately after gaming is not equivalent to one performed at room temperature. If a phone displays a temporary fast-charge notification, record the result rather than assuming that rate continues for the entire interval.
How to compare wireless charging
Wireless charging needs its own table or notes because the maximum advertised rate, the charging pad and alignment all affect the result.
- Standard: identify Qi, Qi2 or another supported system.
- Maximum rate: record the phone’s advertised limit, not merely the pad’s output.
- Accessory compatibility: check whether the pad, case and alignment support the phone’s standard.
- Measured performance: note whether an independent timed test exists. The figures above establish Pixel 10 Pro Fold support for Qi2 up to 15W and Galaxy Z Fold7 Qi compatibility, but they do not establish a universal measured time for either phone.
- Heat and positioning: wireless coils can slow or pause charging when the phone or pad becomes hot or when alignment is poor.
Wireless charging is usually most useful for overnight charging or desk top-ups. If you need the largest recovery during a short stop, compare wired results separately. A pad’s advertised output is not the same thing as power reaching the battery, because conversion losses, alignment and thermal controls intervene.
Cases and hinge geometry can affect positioning on a pad. Test the phone with the case you plan to use, especially if the accessory relies on magnetic alignment. Confirm that a Qi2 pad is appropriate for a phone that supports Qi2, and do not infer Qi2 speed from ordinary Qi compatibility.
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Frequent inner-screen work
If you read documents, edit spreadsheets or browse with the phone unfolded for long periods, prioritize tests that use the main display. A cover-screen result can overstate endurance for this pattern. Inner-screen brightness, refresh rate and active multitasking may consume more than a quick reply session on the outer panel.
Travel and weak-signal use
Airports, trains and rural roads can expose the modem to weak or changing signals. Navigation adds GPS, screen and data use. Expect less runtime than a stable Wi-Fi web test and value a predictable short top-up. A power bank can be a practical backup for travel or long days, but its real usefulness depends on cable compatibility, output and how often you can access it.
Video and social use
Streaming video stresses the display, radio and decoding hardware continuously. Social feeds add network requests and frequent screen wakeups. Look for tests using similar brightness and connectivity, or treat the published endurance as a directional comparison only. Downloaded video on Wi-Fi is a different load from high-resolution streaming over cellular.
Gaming and camera sessions
Games and prolonged camera recording create high processor, graphics and heat loads. Thermal protection may reduce performance or charging speed. A phone that wins a light web test is not automatically the best choice for these workloads. If gaming is central to your decision, seek a gaming-specific drain test rather than extrapolating from browsing.
Mixed cover-screen and standby use
Owners who keep the phone closed for quick replies and unfold it only occasionally may see longer elapsed time between charges than an inner-screen test suggests. Standby drain from accounts, messaging, location and wearables still matters, so check your own overnight loss rather than relying on a capacity number.
Work while charging
Some people charge during video calls, navigation or document work. That pattern can reduce the net gain and increase heat. When this is your normal behavior, run a separate “use while plugged in” observation and report both the charger and workload. A no-use charging test describes the charger’s recovery potential, not the gain during an active session.
A practical buying and testing workflow
- Define your dominant screen. Decide whether your day is mostly inner-screen work, cover-screen messaging, or a mixture.
- Choose a common endurance test. Use results with matching workload, brightness, connectivity and display. Do not combine unrelated “hours” claims into one ranking.
- Record capacity as context. Note the rated or typical capacity, but do not let the larger number override a controlled endurance result.
- Set a recharge interval. Use 15 or 30 minutes and the same starting percentage for every candidate.
- Verify the adapter. Confirm the required USB-C PD/PPS profile, wattage, cable and whether the charger is included. For the Pixel 10 Pro Fold’s stated rate, that means a 30W USB-C PPS charger or higher; for the Galaxy Z Fold7, consult Samsung’s approved-adapter guidance.
- Check wireless needs separately. Confirm Qi or Qi2 support, maximum rate and case compatibility if you charge at a desk or overnight.
- Match the trade-off to your routine. Choose longer tested endurance if you spend hours unfolded away from outlets; choose faster measured recovery if you can recharge briefly between meetings or during travel.
- Validate after purchase. For the first week, note screen time, inner-versus-cover use, cellular signal, brightness, charging intervals and overnight drain. Compare those observations only with tests that resemble them.
- Recheck updates and accessories. Install the intended software updates, then confirm that the adapter, cable and case still support the charging mode you are evaluating. A changed accessory or regional bundle can alter the practical result.
Common comparison mistakes and how to avoid them
Ranking by mAh
Why it fails: it ignores efficiency and screen demand.
Better approach: use capacity to explain a result, then rank phones by a common endurance test.
Mixing manufacturer hours with test hours
Why it fails: “24+ hours,” “up to 30+ hours” and continuous screen-on web time are different measurements.
Better approach: label each as a manufacturer claim or independent test and keep them in separate columns.
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Rank #4
- Designed for Gemini Intelligence, brighter screens, and a more durable design, the new Google Pixel 11 Pro Fold delivers eye-opening performance and makes multitasking effortless[1,2,3]
- Unlocked Android phone gives you the flexibility to change carriers and choose your own data plan: Works with Google Fi, Verizon, T-Mobile, AT&T, and other major carriers[4]
- As stunning as it is strong: Pixel 11 Pro Fold’s ultra-durable composite back is lighter, stronger, and designed to be nearly impossible to crack[5,6]; and with scratch-resistant glass and an all-new hinge, it’s 3x stronger[5]
- Unfold the fun: Drift away into immersive entertainment on the brighter-than-ever 8-inch screen[2]; take it into tabletop mode for hands-free streaming of your favorite content
- Stay informed without looking at your screen: When your phone is face down, Pixel HiLight gently alerts you with subtle glowing lights when your favorite contacts are calling or you’re talking with Gemini; exclusive to Google Pixel 11 Pro phones
Quoting “fast charging” without a time
Why it fails: the phrase says nothing about the starting percentage, adapter or protocol.
Better approach: report the gain after 15 or 30 minutes and name the charger conditions.
Assuming the box contains the required adapter
Why it fails: Google says the 30W USB-C PPS charger for the Pixel 10 Pro Fold’s stated performance is sold separately; regional bundles can differ.
Better approach: check the in-box list and buy a compatible PPS or approved adapter before relying on the advertised rate.
Using a pad’s wattage as the phone’s speed
Why it fails: wireless output, phone limits, alignment and heat determine the actual battery gain.
Better approach: identify the phone’s supported standard and maximum rate, then look for a timed test with the intended pad and case.
Ignoring heat
Why it fails: hot phones can throttle charging and drain faster during use.
Better approach: let devices cool before timed comparisons and record whether the phone was active during charging.
Treating one review as a universal ranking
Why it fails: no single test covers every current foldable worldwide or every combination of screens, apps, radios and standby time.
Better approach: name the models and conditions covered, then adjust the decision for your own workload.
Check the charger before you buy
For the Pixel 10 Pro Fold, Google’s stated 50%-in-about-30-minutes result requires a 30W USB-C PPS charger or higher, and Google says the charger is sold separately. A compatible 30W USB-C PPS wall charger is the relevant accessory category to search for; confirm the exact protocol and regional availability before purchasing. For the Galaxy Z Fold7, use Samsung’s approved-adapter guidance and verify whether a 25W or 45W adapter matches your intended setup.
A USB-C power bank can add flexibility on a long travel day, but there is no universal capacity recommendation here. Check its output profile, cable and airline or regional requirements, and do not assume that a high printed capacity translates directly into the phone’s usable charge. Accessories should be selected after confirming the phone and charging protocol, not from wattage alone.
The decision in one sentence
For a defensible foldable-battery choice, compare same-method endurance first, compare timed wired recovery second, use capacity and manufacturer claims as context, and verify the exact charger and wireless standard you will use.
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Frequently Asked Questions
Does a larger battery guarantee longer foldable-phone battery life?
No. Capacity is only one input. Processor efficiency, display size and brightness, modem conditions, software, heat and workload can outweigh a capacity difference. In Tom’s Guide’s 2026 test, the Pixel 10 Pro Fold’s 5,015mAh-class battery lasted longer than the Galaxy Z Fold7’s 4,400mAh battery, but that does not guarantee the same result for every use pattern.
Which foldable lasted longest in Tom’s Guide’s 2026 test?
The Razr Fold lasted 14 hours 44 minutes in the continuous web-surfing test with the larger main display active. Pixel 10 Pro Fold lasted 12 hours 16 minutes, OnePlus Open 11 hours 45 minutes and Galaxy Z Fold7 10 hours 55 minutes.
Which foldable charged fastest in that 30-minute comparison?
The OnePlus Open recorded an 85% gain after 30 minutes, ahead of Razr Fold at 75%, Pixel 10 Pro Fold at 58% and Galaxy Z Fold7 at 54%. The report does not establish identical adapters or starting levels for every model, so treat these as test observations rather than universal charging guarantees.
What charger does the Pixel 10 Pro Fold need for Google’s 50%-in-30-minutes claim?
Google specifies a 30W USB-C PPS charger or higher and says the charger is sold separately. Confirm that the adapter and cable support the required USB-C PPS profile.
Does the Galaxy Z Fold7 support wireless charging?
Samsung lists Qi compatibility, Fast Wireless Charging 2.0 and Wireless PowerShare. The exact measured speed depends on the pad, alignment, case and heat; the listed specifications do not establish a universal time to full charge.
Should I compare 15-minute or 30-minute charging?
Use the interval that matches your routine, but keep it identical across phones. Fifteen minutes represents a quick stop; 30 minutes represents a longer break. Always state the starting percentage, ending percentage or gain, charger, protocol and whether the phone was being used.
The Bottom Line
Choose a foldable by matching evidence to your routine: use a common inner-screen endurance test for longevity, a timed wired test for quick recovery, and separate wireless and manufacturer claims from independent results. Confirm the required adapter—especially the Pixel’s separately sold 30W USB-C PPS charger—and treat mAh as context, not a verdict.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
