Acer Liquid C1 Replacement Battery BAT-2000 3.7V 2000mAh

Acer Liquid C1 — 3.7V Li-ion Replacement Battery (BAT-2000)

This is a 3.7V, 2000mAh Li-ion cell built to the BAT-2000 spec for the Acer Liquid C1 smartphone. It replaces the original battery when the existing cell can no longer hold a stable charge or shuts the phone down under load. Dimensions are 60.45 × 55.61 × 4.80mm — confirm these against your existing cell before fitting.

• Liquid C1 fitment: The Liquid C1 uses a fixed connector pinout and BMS handshake tied to the BAT-2000 spec. Swapping in a cell that does not match this voltage profile will cause the charge IC to reject the battery or report erratic percentages from the first boot.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Liquid C1 platform, confirming the BMS accepted the cell without triggering protection cutoff and that the fuel gauge IC tracked state-of-charge across the full discharge curve.
• Fuel gauge recalibration on first use: On first install, disable fast charging if your charger supports it, then run one full discharge down to auto-shutdown followed by a complete charge to 100%. This gives the fuel gauge IC one clean reference cycle against the new cell's discharge curve before high-current charging begins.

Why the Liquid C1 shuts down suddenly at 20–30% after a cell swap

The Liquid C1's fuel gauge IC maps state-of-charge using a discharge curve calibrated to the original cell. A new cell has a slightly different internal resistance profile, so the IC miscalculates how much charge remains. When the modem fires or the screen brightness spikes, the actual cell voltage drops below the low-voltage cutoff threshold faster than the gauge predicted — and the phone shuts off. One full discharge-to-shutdown followed by a complete charge cycle rewrites the coulomb counter's baseline and eliminates this behaviour.

Phone shows wrong battery percentage after fitting the new cell

This is a fuel gauge IC calibration issue, not a fault with the replacement cell. The coulomb counter retains learned data from the old cell and applies it to the new one — the result is percentages that jump, stall, or drop faster than actual capacity warrants. Force a full discharge until the phone powers off on its own, then charge uninterrupted to 100% without removing the charger. After one complete cycle the IC recalculates against the new cell and percentage reporting stabilises.