The iPhone 8 replacement battery is a zero-cycle 1821 mAh aftermarket cell that matches the original Apple capacity, voltage, and watt-hour rating. Built around a Texas Instruments battery management IC and supplied as the cell only (adhesive sold separately), it restores a tired iPhone to all-day runtime. Supplied by GA Tech NZ from local stock with same-day weekday dispatch and a 6-month manufacturing-defect warranty.
Place your order by 2PM on business days for same-day dispatch. Tracked overnight delivery for only $8Â urban areas or $13 rural locations, across New Zealand.
$16.00
2 in stock
2 in stock
The iPhone 8 replacement battery is a high-quality 1821 mAh aftermarket cell engineered to restore your iPhone 8 to original-spec runtime. In particular, capacity, voltage, watt-hours, and physical dimensions all match Apple’s reference design, so the battery drops into the existing chassis with no shimming, no fit issues, and no surprises at boot. In addition, NZ stock, professional-grade build, and a 6-month warranty round out the package.
This iPhone 8 replacement battery brings four advantages that matter for a daily-driver repair: an original-spec 1821 mAh cell that restores factory-equivalent runtime, a Texas Instruments battery management IC for safe charging and discharge protection, an install workflow matched to the iPhone 8’s service profile, and full NZ logistics with same-day dispatch from local stock. The cell ships zero-cycle, which means it has not been charged or discharged before reaching you, so you get the full design lifespan from day one.
| What you get | How it benefits you |
|---|---|
| Original-spec 1821 mAh capacity | All-day runtime that tracks the factory cell, with no drop-off in standby time. |
| Texas Instruments battery management IC | Proven charging chemistry with overcharge, over-discharge, and short-circuit protection built into the pack. |
| Zero-cycle, factory-fresh cell | Full design lifespan from first charge. No prior wear, no shelf degradation beyond standard storage. |
| Cell-only supply, adhesive sold separately | Technicians fit fresh adhesive strips of their preferred brand. Pre-installed adhesive is not bundled with this listing. |
| NZ stock, 2pm dispatch cutoff | Weekday orders placed before 2pm ship the same day with tracked overnight delivery nationwide. |
| 6-month manufacturing-defect warranty | Local NZ-backed warranty cover, handled directly by GA Tech NZ. |
First, this iPhone 8 replacement battery fits Apple iPhone 8 (model numbers A1863, A1905, A1906). The iPhone 8 cell is shared with the iPhone SE (2020). Both models use the same 1821 mAh pack. Once the battery is seated and connected, the cell uses standard Li-ion chemistry matched to Apple’s reference design, so the iPhone 8 powers on, charges, and holds charge the same way it did with the factory cell.
For context, Apple’s original iPhone 8 cell rates at 1821 mAh, 3.82 V nominal, 4.35 V charging cutoff, and 6.96 Wh. As a result, this replacement battery matches every one of those numbers, which is what makes the runtime feel native after installation. In practice, customers commonly report that a tired iPhone 8 jumps from a few hours of standby back to a full day on a single charge, which is the result of swapping a worn cell back to fresh, factory-spec capacity.
In particular, this battery suits three groups of buyers. First, iPhone 8 owners whose original cell has degraded below acceptable runtime and who want to keep using the device for another couple of years. Second, NZ repair shops and trade technicians who need a reliable, local-stocked iPhone 8 battery for paid repair work. Third, experienced DIY repairers who already own the precision tools and have replaced a screen or battery before. However, for first-time DIY repairers, GA Tech NZ offers professional fitting through the in-house repair service to remove the risk of damaging surrounding flex cables.
Typically, a new Li-ion cell retains 80 percent of its design capacity through roughly 500 full charge cycles, which works out to two or three years of normal daily use. After 500 cycles, capacity will begin to taper, and the next replacement window opens. Meanwhile, GA Tech NZ’s 6-month warranty covers manufacturing defects in the first 6 months from delivery, and the cell itself is built to deliver the full Li-ion design lifespan when charged within Apple’s voltage range.
Since 2017, GA Tech NZ has supplied spare parts and repair services across New Zealand. Because GA Tech NZ holds the iPhone 8 battery in local stock, weekday orders placed before 2pm ship the same day with tracked overnight courier delivery nationwide. Generally, urban delivery sits at $8 and rural at $13, with most orders landing the next business day. In addition, buyers who want a fitted result can book in-house iPhone 8 battery replacement. Meanwhile, for complementary parts and tools, browse the iPhone parts and repair tools categories. Finally, to confirm Apple-published specifications for the iPhone 8, see the Apple iPhone 8 technical specifications or the iPhone 8 listing on GSMArena.
| Specification | Detail |
|---|---|
| Product type | Aftermarket replacement battery (zero cycle) |
| Compatible model | iPhone 8 (A1863, A1905, A1906) |
| Capacity | 1821 mAh (matches Apple original) |
| Rated voltage | 3.82 V nominal |
| Charging cutoff voltage | 4.35 V |
| Watt-hours | 6.96 Wh |
| Battery chemistry | Lithium-ion polymer |
| Battery management IC | Texas Instruments |
| Cycle count at delivery | Zero (factory-fresh) |
| Battery adhesive | Not included (sold separately) |
| Display adhesive included | No (sold separately for resealing the screen) |
| iOS tested range | iOS 13 onward (no battery validation warnings apply to this model) |
| Compliance documents | CE (NCT25007416XE1-1), FCC (NCT25007419XE1-1), plus UN38.3, MSDS, 1.2M drop test, and air transport classification at supplier level |
| Warranty | 6 months against manufacturing defects |
| Return window | 7-day change-of-mind on unopened parts under GA Tech NZ T&C |
Specifically, this replacement battery fits the following Apple iPhone 8 model numbers. The iPhone 8 cell is shared with the iPhone SE (2020). Both models use the same 1821 mAh pack.
Before ordering, to confirm your iPhone 8 model number, open Settings > General > About on your iPhone, then scroll down to Model Number. If the number starts with M or N, tap it once to reveal the A-number.
Generally, the iPhone 8 battery sits beneath the display, secured by adhesive strips and connected via a flex cable to the logic board. Typically, a trained technician completes the full swap in 20 to 30 minutes. Therefore, GA Tech NZ offers in-house iPhone 8 battery replacement for buyers unfamiliar with iPhone disassembly.
First, the supplier holds a CE Declaration of Conformity (NCT25007416XE1-1, EU Council EMC Directive 2014/30/EU) and an FCC Supplier’s Declaration of Conformity (NCT25007419XE1-1, FCC Part 15 Subpart B / ANSI C63.4:2014) for this battery line, with this iPhone model explicitly named in the multi-model coverage list, both issued by NCT Testing Technology under CNAS L8281 accreditation. In addition, the supplier holds standard lithium-battery transport and safety documentation, including UN38.3 test reports, MSDS, 1.2M drop test, and air transport identification under CNAS-accredited testing. As a result, the battery line ships with the compliance paperwork required for safe NZ courier transit.
Specifically, the iPhone 8 replacement battery is rated at 1821 mAh, 3.82 V nominal, 4.35 V charging cutoff, and 6.96 Wh. As a result, these numbers match the original Apple cell specification exactly, which is why runtime after installation tracks the factory experience closely.
Yes, indeed. Because the cell is zero-cycle and built to Apple’s original capacity specification, a tired iPhone 8 typically returns to all-day standby and full-day mixed use after the swap. However, real-world runtime depends on screen brightness, mobile signal strength, and background app activity.
Generally, a new Li-ion cell retains 80 percent of its design capacity through approximately 500 full charge cycles. With normal daily use, that works out to roughly two to three years before the next noticeable degradation. Meanwhile, GA Tech NZ’s 6-month warranty covers any manufacturing defects in the first 6 months from delivery.
Specifically, this pack fits iPhone 8 A1863, A1905, A1906. The iPhone 8 cell is shared with the iPhone SE (2020). Both models use the same 1821 mAh pack. Therefore, confirm your A-number in Settings > General > About before ordering.
No to the 8 Plus and 7 directly. However, the iPhone SE (2020) uses the same physical 1821 mAh cell as the iPhone 8, so this battery does fit the SE 2 as well. The 8 Plus uses a 2691 mAh cell and the iPhone 7 uses a 1960 mAh cell, both in different sizes.
Yes, indeed. In fact, GA Tech NZ offers in-house iPhone 8 battery replacement. Generally, the full job takes 20 to 30 minutes in the workshop and includes a final test before handover.
Generally, weekday orders placed before 2pm dispatch the same day with tracked overnight courier delivery nationwide. In addition, urban delivery is $8 and rural is $13. As a result, most orders arrive the next business day.
First, GA Tech NZ provides a 6-month warranty against manufacturing defects on this iPhone 8 replacement battery. However, the warranty does not cover physical damage, installation errors, or water damage. In addition, GA Tech NZ accepts change-of-mind returns on unopened parts in new unused condition within 7 days of receipt under the GA Tech NZ terms and conditions.
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