Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Apple iPhone 8 Li-Polymer Replacement Battery 616-00357 3.82V 1950mAh

Up to 21% off
New arrival
From $26.99 USD $33.99
Shipping calculated at checkout.
Fits Apple iPhone 8 models with original part number 616-00357 or 616-00358.
Voltage is 3.82V at 1950mAh capacity, matching the original energy spec.
Connector type is proprietary Apple flex cable with vertical orientation and tab locking.
Bench test showed normal BMS discharge curve with no early cutoff under load simulation.
On first charge after installation, disable fast charging for one complete discharge-charge cycle to recalibrate the fuel gauge IC.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.82V

Amp

1950mAh

Apple iPhone 8 — 3.82V Li-Polymer Replacement Battery (616-00357)

This is a 3.82V, 1950mAh Li-Polymer cell that replaces the original battery in the Apple iPhone 8. It fits models A1863, MQ6K2LL/A, MQ7H2ZP/A, and related SKUs listed under OEM part numbers 616-00357 and 616-00358. When the original cell degrades past Apple's 80% capacity threshold, iOS throttles CPU performance — swapping the cell restores full clock speed.

  • iPhone 8 compatibility: All A1863 and MQ-series iPhone 8 variants use the same 3.82V battery connector, BMS handshake protocol, and fuel gauge IC pairing. One cell fits every regional variant in this lineup.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an iPhone 8 logic board. The BMS accepted the charge curve without faults, and the fuel gauge IC began tracking state-of-charge correctly after one complete cycle.
  • First-cycle fuel gauge reset: After installation, disable fast charging and run one full discharge down to auto-shutdown, then charge uninterrupted to 100%. This gives the coulomb counter a clean baseline against the new cell's discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on a replacement cell

The iPhone 8's fuel gauge IC stores a learned discharge curve from the original cell. A fresh cell has lower internal impedance, so the voltage-versus-capacity curve shifts. When the gauge predicts a voltage cliff using the old curve, it triggers an early shutdown even though charge remains. One full discharge-to-shutdown and uninterrupted recharge resets the coulomb counter and eliminates false cutoffs. After that cycle, reported percentage tracks actual cell state accurately.

USB-PD fast charge not activating after cell swap

On the first cycle after installation, the iPhone 8 charge IC can default to standard 5W charging while it negotiates with the new cell's BMS. This is normal behaviour — the IC runs a conservative handshake on an uncalibrated cell. Complete one standard charge cycle to 100% first. Fast charging via USB-PD typically re-enables automatically from the second cycle onward once the BMS reports a valid state-of-health above 3.6V resting voltage.

Compatible Models

iPhone 8 MQ7H2ZP/A A1863 MQ6K2LL/A MQ7F2LL/A MQ6L2LL/A MQ7H2LL/A MQ7G2LL/A MQ6M2LL/A

Replaces Part Numbers

616-00357 616-00358

Technical Specifications

Voltage3.82V
Amp Hours1950mAh
Capacity1950mAh
Rate7.45Wh
Net Weight30g /1.06 oz
Gross Weight80g /2.82 oz
Approximate Weight80g /2.82 oz
Dimension 92.88 x 38.25 x 3.32mm

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My iPhone 8 keeps shutting off around 25% battery even though I just replaced the cell — what's causing that?

The fuel gauge IC is still running the discharge curve it learned from your old, degraded cell. A fresh cell has different impedance characteristics, so the predicted voltage cliff doesn't match reality and the phone cuts out early. Run one full discharge to automatic shutdown, then charge straight to 100% without interruption. After that calibration cycle, the coulomb counter resets to the new cell's curve and early shutdowns stop.

The battery percentage on my iPhone 8 is jumping around erratically after the swap — is the new cell faulty?

It's not a faulty cell — it's the fuel gauge IC recalibrating. The original cell logged thousands of charge cycles worth of data; the replacement cell has none. Until the IC runs one complete discharge-charge reference cycle, it interpolates percentage from incomplete data, which causes the erratic jumps. Let the phone drain fully to shutdown once, then charge uninterrupted to 100%, and the gauge will stabilise at resting voltage around 3.82V.

The phone gets noticeably warm near the battery during the first few charges after replacement — should I be concerned?

A new high-impedance cell produces slightly more heat than a worn cell during initial charge cycles because the charge IC hasn't yet tuned its current delivery to the new cell's resistance profile. The warmth should reduce after two or three full cycles as the IC adapts. If the phone stays hot past the third full charge or exceeds a warm-but-touchable threshold, check that the battery connector is fully seated — a partially connected cell forces the charge IC to push higher current to compensate, raising heat output.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Apple iPhone 8 Replacement Battery, 3.82V, 1950mAh, Li-Polymer 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections