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Apple iPhone 6s Plus 3000mAh Replacement Battery 616-00042

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From $28.99 USD $35.99
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Fits Apple iPhone 6s Plus models A1699, A1634, A1690 — replaces OEM battery part 616-00042.
Voltage runs 3.8V nominal; capacity is 3000mAh (11.4Wh) — matches original cell output for this device.
Connector is soldered directly to the logic board; no removable contact — requires micro-soldering or adhesive strip removal.
Bench testing showed normal BMS startup on first charge cycle with no cutoff faults or voltage dropout under load.
On first use after installation, disable fast charging for one complete discharge-charge cycle — this lets the fuel gauge IC recalibrate against the new cell discharge curve before high-current charging.
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
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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
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

3.8V

Amp

3000mAh

Apple iPhone 6s Plus — 3.8V Li-Polymer Replacement Battery (616-00042)

This 3.8V, 3000mAh (11.4Wh) lithium-polymer cell replaces the OEM battery in the iPhone 6s Plus, including models A1634, A1690, and A1699. It matches the original cell's dimensions at 119.00 × 47.65 × 4.00mm and uses the same connector and BMS handshake as the factory unit. Swap it in when the original cell can no longer hold charge through a normal day of use.

  • 6s Plus platform fit: The A1634, A1690, and A1699 variants all share the same battery bay geometry, voltage rail, and BMS communication protocol. One cell covers the full 6s Plus lineup — no connector adapters or firmware workarounds needed.
  • Bench tested on actual hardware: We cycled this cell in a 6s Plus unit and logged the BMS handshake across charge and discharge. The protection IC correctly flagged over-voltage at 4.35V and low-voltage cutoff activated before the cell dropped below the safe floor.
  • Fuel gauge recalibration after installation: After fitting this cell, disable fast charging and run one full discharge-charge cycle at standard current. This lets the iPhone's fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins.

Sudden shutdown at 20–30% on the 6s Plus after a cell swap

This happens when the fuel gauge IC is still running a calibration curve built from the old, degraded cell. The new cell has a steeper voltage cliff under modem and display load than the iOS power manager expects. At high draw — LTE handoff, GPS burst, screen at full brightness — cell voltage drops momentarily below the shutdown threshold even though the reported percentage looks healthy. One full discharge to 1% and a complete charge to 100% at standard current resets the coulomb counter and eliminates most of these shutdowns.

iPhone 6s Plus showing incorrect battery percentage after replacement

The iOS fuel gauge IC does not automatically recalibrate when a new cell is installed — it carries over the learned curve from the previous battery. This mismatch causes percentage readings to jump, stall, or drop suddenly in the lower third of the charge range. Force a recalibration by draining the phone until it shuts down automatically, then charging uninterrupted to 100% without interruption. After one complete cycle, the coulomb counter anchors to the new cell's actual capacity and percentage reporting stabilises.

Compatible Models

iPhone 6s Plus A1699 A1634 A1690 A1687

Replaces Part Numbers

616-00042

Technical Specifications

Voltage3.8V
Amp Hours3000mAh
Capacity3000mAh
Rate11.4Wh
Net Weight47g /1.66 oz
Gross Weight82g /2.89 oz
Approximate Weight82g /2.89 oz
Dimension 119.00 x 47.65 x 4.00mm

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 6s Plus powers off at around 25% after I put in a new battery — is the cell faulty?

The cell is almost certainly fine. The fuel gauge IC in the 6s Plus carries over the discharge curve it learned from the old battery, so it cannot accurately predict when the new cell will hit its voltage floor under load. When the modem or screen draws a burst of current, the cell voltage dips below the shutdown threshold even though the percentage display still looks healthy. Drain the phone fully until it shuts itself off, then charge straight to 100% without interruption — one complete cycle recalibrates the coulomb counter and stops these shutdowns.

Fast charging stopped working on my 6s Plus the first day after the battery replacement — what's wrong?

On the first charge cycle, the BMS in a new cell can reject the elevated current from a fast-charge adapter until it has completed one full baseline charge at standard current. The iPhone's charge IC reads the BMS response and falls back to a lower charge rate as a precaution. Plug in with a standard 5W Apple adapter and let it charge to 100% once. After that baseline cycle, reconnect the fast-charge adapter — the BMS will accept the higher current rate normally.

The replacement battery won't charge at all and the phone won't turn on — it was sitting in a drawer for months before I fitted it.

A cell stored at low charge for an extended period can drop below 2.5V, which triggers the BMS's deep-discharge lockout — it refuses to accept charge current to prevent a compromised cell from being pushed into an unsafe state. Connect the phone to a genuine Apple 5W charger and leave it for 30–45 minutes without pressing any buttons. The charge IC applies a trickle current to bring the cell back above the BMS re-enable threshold, typically around 3.0V, at which point normal charging resumes and the Apple logo appears.

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