KT.0010J.008 Acer Liquid E2 Replacement Battery 3.7V 1800mAh

Acer Liquid E2 / V370 — 3.7V Li-ion Replacement Battery (KT.0010J.008)

This is a 3.7V, 1800mAh Li-ion replacement battery for the Acer Liquid E2, Liquid E2 Duo, and V370 smartphones. It matches OEM part numbers KT.0010J.008 and JD-201212-JLQU-C11M-003. Swap it in when the original cell no longer holds a usable charge through a normal day.

• Liquid E2, E2 Duo, and V370 compatibility: All three models run the same 3.7V single-cell architecture with an identical connector pinout and BMS handshake protocol. One cell fits all three without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the V370 platform. The BMS accepted the new cell without error flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold during deep-discharge simulation.
• Fuel gauge recalibration after install: After fitting this cell, run one full discharge down to auto-shutoff, then charge uninterrupted to 100% before normal use. The Liquid E2 fuel gauge IC calibrates its coulomb counter against the first complete cycle — skipping this step causes the OS to read percentage against the old cell's discharge curve.

Why the Liquid E2 shuts down suddenly at 20–30% after a cell swap

The Acer Liquid E2 uses a coulomb-counting fuel gauge IC that maps voltage to percentage using a stored discharge curve from the original cell. A new cell has a different internal resistance profile, so the gauge underestimates how close the cell is to its actual low-voltage cutoff. When the modem fires a high-current burst — during a call or data sync — the cell voltage drops sharply below the 3.0V hardware cutoff, and the phone shuts off instantly. The fix is one complete unconstrained discharge-charge cycle so the IC can rebuild its internal map against the new cell's actual curve.

Phone won't power on after the replacement battery sat in storage

Li-ion cells self-discharge in storage, and if this battery sat unused for several months before installation, the cell voltage may have dropped below 2.5V — the threshold at which the BMS latches into lockout mode to prevent further discharge damage. The phone will show no response at all: no charge indicator, no boot attempt. Connect the phone to a low-current USB charger (a standard 5V 500mA port, not a fast charger) and leave it for 20–30 minutes without pressing the power button. Once the BMS detects cell voltage rising above approximately 2.8V, it exits lockout and normal charging resumes.