JM1 BlackBerry Bold Touch 9900 Replacement Battery 3.7V 1450mAh

BlackBerry Bold Touch 9900 — 3.7V Li-ion Replacement Battery (JM1 / BAT-30615-006)

This 3.7V, 1450mAh lithium-ion battery replaces the JM1 / BAT-30615-006 cell in the BlackBerry Bold Touch 9900 and 9930 smartphones. It also fits the Pluto and Montana variants that share the same battery bay dimensions and connector pinout. Voltage and capacity match the original specification exactly.

• Bold Touch 9900 / 9930 platform fit: The 9900 and 9930 share a common battery bay, connector layout, and BMS handshake protocol. Both models accept the JM1 cell format — same 65.00 × 43.50 × 4.39mm footprint, same three-pin connector, same charge termination voltage at 4.2V.
• Bench tested on actual hardware: We cycled this cell on a 9900 unit through charge and discharge. The BMS accepted the cell without error, charge termination triggered correctly at 4.2V, and the protection circuit tripped at the expected low-voltage cutoff threshold.
• Fuel gauge recalibration on first cycle: After fitting this cell, run one complete discharge to shutdown and then charge to 100% before using the device heavily. The Bold 9900's fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step causes the percentage readout to lag or jump erratically for several days.

Sudden shutdown at 20–30% on the Bold Touch 9900

This happens because the fuel gauge IC still references the discharge curve of the old, degraded cell. When the new cell's voltage drops under modem or display load, the gauge miscalculates remaining capacity and the phone hits a voltage floor it wasn't expecting. The result is an abrupt shutdown despite the percentage showing headroom. One full discharge-to-shutdown followed by a complete charge lets the coulomb counter re-anchor to the new cell's actual curve. After that cycle, shutdowns at false percentages stop.

Device will not power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this battery has been sitting for months, the cell voltage may have dropped below 3.0V — the threshold where the Bold 9900's BMS locks out to prevent damage. The phone will show nothing when you press power. Connect it to a wall charger, not a PC USB port, and leave it for 20–30 minutes without pressing anything. The charge IC will trickle current into the cell until it clears the BMS lockout voltage, at which point normal charging resumes and the device will power on.