DOOV LM1 Replacement Battery PL-C15 3.8V 2000mAh

DOOV LM1 — 3.8V Li-Polymer Replacement Battery (PL-C15)

This is a 3.8V, 2000mAh (7.6Wh) Li-Polymer cell that fits the DOOV LM1 smartphone. It replaces the original PL-C15 pack when the existing cell can no longer hold charge or causes unexpected shutdowns. Dimensions are 75.90 × 60.76 × 3.08 mm — verify physical fit before installation.

• LM1 platform compatibility: The LM1 uses a 3.8V single-cell Li-Polymer architecture with a connector and BMS handshake matched to the PL-C15 spec. Swapping in a cell outside that voltage window trips the charge IC and prevents the device from powering on.
• Bench tested on actual hardware: We cycled this cell through charge and discharge passes on the LM1 platform. The BMS accepted the cell without fault codes, and the charge IC reached termination voltage cleanly at each pass.
• Fuel gauge recalibration on first use: On the first use after installation, disable fast charging and run one full discharge-to-charge cycle at standard rate. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the DOOV LM1 after a cell swap

A new Li-Polymer cell has a different internal resistance profile than the aged cell the fuel gauge IC was trained on. Under high-draw moments — screen at full brightness, mobile data active, GPS running — the new cell's voltage sags faster than the coulomb counter expects. The system reads a safe percentage but the actual cell voltage drops below the hardware cutoff threshold and the phone shuts off. One full discharge-charge cycle at standard rate recalibrates the coulomb counter to the new cell curve and corrects the voltage-to-percentage mapping.

OS percentage jumping erratically after replacement

The LM1's fuel gauge IC stores a learned discharge model from the old cell in non-volatile memory. A new cell with different capacity characteristics causes the IC to misread state-of-charge, producing percentage jumps of 10–15% in either direction. The fix is a full calibration cycle: drain the phone until it powers off automatically, then charge uninterrupted to 100% with fast charging disabled. After one complete cycle the IC overwrites the stale model and percentage readings stabilise.