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 14 Plus A2850 Compatible Battery 3.87V 4300mAh

Up to 20% off
New arrival
From $48.99 USD $60.99
Shipping calculated at checkout.
Fits Apple iPhone 14 Plus model A2850 battery slot without modification or adapter.
3.87V, 4300mAh Li-Polymer cell restores full charge capacity to address sudden shutdowns and rapid drain.
Lightning connector orientation matches OEM; no physical modification of the phone housing required for installation.
Bench testing showed stable voltage hold under screen and modem load; BMS accepted standard iOS charging protocol on first cycle.
On first use after installation, run one full discharge-to-charge cycle with standard charging only — this recalibrates the fuel gauge IC to the new cell discharge curve before USB-PD fast charging resumes.
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

3.87V

Amp

4300mAh

Apple iPhone 14 Plus — 3.87V Li-Polymer Replacement Battery (A2850)

This is a 3.87V, 4300mAh Li-Polymer battery with OEM part number A2850, built to fit the Apple iPhone 14 Plus. It replaces a degraded or failed original cell to restore normal device operation. Dimensions are 100.20 x 50.70 x 5.00mm — confirm your existing cell matches before installation.

  • iPhone 14 Plus fit: The 14 Plus uses a dedicated battery bay and BMS handshake tied to the A2850 part number. Swapping in a cell with a mismatched connector pinout or incorrect flex routing will prevent the charge IC from negotiating fast charge — even if the phone powers on.
  • Bench tested on actual hardware: We cycled this cell through full discharge and charge sequences on the iPhone 14 Plus platform. The BMS completed its charge termination cycle correctly and the fuel gauge IC accepted the new cell without flagging a service warning on first boot.
  • First-cycle fast charge hold-off: After installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current fast charging pushes elevated current into an uncalibrated cell.

Why the iPhone 14 Plus reports wrong battery percentage after a cell swap

The iPhone's fuel gauge IC builds a discharge model against the original cell over hundreds of cycles. When you install a new cell, that learned model no longer matches the actual voltage-to-capacity curve of the fresh cell. The result is percentage readings that jump, stall, or drop suddenly — typically in the 15–40% range where voltage curves diverge most. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% forces the coulomb counter to reset and remap against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the BMS cutoff threshold under peak load — typically during 5G modem activity or display brightness spikes — even though the gauge still reads above 20%. A fresh cell with an uncalibrated fuel gauge IC will report a higher state of charge than the actual terminal voltage supports under load. Run two full discharge-charge cycles without interruption. After calibration, the gauge tracks voltage sag accurately and the phone holds on until a true low-cell-voltage condition at approximately 3.0V triggers the controlled shutdown.

Compatible Models

iPhone 14 Plus

Replaces Part Numbers

A2850

Technical Specifications

Voltage3.87V
Amp Hours4300mAh
Capacity4300mAh
Rate16.64Wh
Net Weight58g /2.05 oz
Gross Weight108g /3.81 oz
Approximate Weight108g /3.81 oz
Dimension 100.20 x 50.70 x 5.00mm

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 14 Plus won't turn on at all after the replacement battery sat in a drawer for a few months — is the battery dead?

The BMS locks out the cell when terminal voltage drops below roughly 2.5V during storage. The phone won't respond to the power button because the protection circuit has disconnected the cell from the load rail entirely. Plug into a wall charger — not a computer USB port — and leave it for 20–30 minutes without attempting to power on. If the charging indicator appears, the BMS has recovered and the cell will charge normally from that point.

Fast charging stopped working on my iPhone 14 Plus after I put in the new battery — it only trickle charges now.

On the first cycle after a cell replacement, the charge IC sometimes refuses to negotiate USB-PD fast charge because the fuel gauge IC has no calibrated data on the new cell's impedance. The phone defaults to a low-current charge rate as a precaution. Complete one full slow charge to 100% without interrupting it, then discharge the phone to automatic shutdown. After that cycle, reconnect to a USB-PD charger — the IC will renegotiate the higher current profile once it has a baseline for the new cell.

The battery percentage on my iPhone 14 Plus jumps around erratically — it reads 45%, then skips to 28% a few minutes later without heavy use.

The coulomb counter in the fuel gauge IC is still mapped to the discharge curve of the original worn cell. A fresh 4300mAh cell has a significantly different voltage slope, so the IC misreads state-of-charge at multiple points across the curve. Discharge the phone fully until it shuts itself down, then charge it uninterrupted to 100%. Repeat this once more. After two full cycles the fuel gauge recalibrates its model to the new cell and percentage readings stabilise.

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 14 Plus Replacement Battery, 3.87V, 4300mAh, 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