Nokia 6215 BL-5002C Replacement Battery 3.7V 800mAh

Nokia 6215 / 6215i — 3.7V Li-ion Replacement Battery (BL-5002C)

This is a 3.7V, 800mAh Li-ion replacement battery for the Nokia 6215 and 6215i mobile phones. It uses OEM part number BL-5002C and restores power to a phone where the original cell has degraded or stopped holding a charge. Voltage and connector match the original Nokia specification.

• Nokia 6215 and 6215i compatibility: Both the 6215 and 6215i use the same BL-5002C battery slot, voltage rail at 3.7V nominal, and identical connector footprint. There is no BMS handshake variation between the two models — the same cell works in both without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the 6215 platform. The BMS accepted charge without error flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold during deep discharge testing.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge accessory and run one full discharge-charge cycle before normal use. The phone's fuel gauge IC is still calibrated to the old cell's discharge curve — one complete cycle lets it remap against the new cell's actual capacity before reporting percentages accurately.

Sudden shutdown at 20–30% on the Nokia 6215 after a cell swap

This is a voltage cliff issue, not a capacity defect. When the phone is under load — active call, screen on, GSM radio transmitting — the cell voltage drops faster than the fuel gauge IC predicts. The gauge was trained on the old cell's internal resistance profile, so it reads 25% remaining while the actual cell voltage has already fallen below the modem's minimum supply threshold. The phone shuts off to protect the modem circuit, not because the battery is faulty. One full discharge-charge cycle resets the coulomb counter and eliminates this behaviour.

Nokia 6215 not powering on after the battery sat in storage

Li-ion cells in storage self-discharge over time. If the cell drops below approximately 2.5V, the BMS enters lockout mode and blocks current flow to protect the cell from damage. The phone will show no response to the power button — this is not a dead phone. Connect the phone to a low-current charger and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell until it clears the 2.5V threshold, at which point the BMS re-enables normal charging and the phone will boot.