Nokia BP-6P 6500 Replacement Battery 3.7V 750mAh

Nokia 6500 / 6500 Classic Series — 3.7V Li-ion Replacement Battery (BP-6P)

This is a 3.7V, 750mAh Li-ion cell replacing the original BP-6P in Nokia's 6500 slider range. It fits the 6500, 6500C, 6500 Classic, and 7900. The cell matches the original footprint at 38.02 × 38.00 × 5.65mm so it seats correctly in the battery bay.

• 6500 and 7900 compatibility: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 6500 Classic. The BMS accepted the charge IC handshake cleanly, and the protection circuit triggered correctly at low-voltage cutoff — no false shutdowns above 3.0V.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one full discharge-to-charge cycle. The fuel gauge IC in this phone was calibrated against the original cell's discharge curve. One complete cycle lets it remap to the new cell before reporting accurate percentage readings.

Sudden shutdown at 20–30% on the 6500 after a cell swap

This phone's processor and GSM radio draw a short high-current burst during call setup and transmission. A new cell with a slightly different internal resistance profile can cause a momentary voltage dip that the protection circuit reads as a low-voltage fault. The BMS cuts power before the displayed percentage reaches zero. One full discharge-charge cycle after fitting the new cell usually resolves this — it allows the fuel gauge IC to align its cutoff threshold with the actual discharge curve of the replacement cell. If shutdowns persist, check that the battery contacts on the phone are clean and making full contact.

Phone not powering on after the replacement cell sat in storage

Li-ion cells stored at low charge self-discharge slowly. If the cell voltage drops below approximately 2.5V, the BMS locks out charging as a safety measure — the phone shows nothing when connected to a charger. Connect the phone to a wall charger rated at 5V and leave it for 20–30 minutes without attempting to power it on. The charge IC applies a trickle current to bring the cell back above the BMS re-enable threshold, typically around 2.9V. Once the phone shows a charging indicator, proceed with a normal charge cycle.