About this replacement
Festool CCD12 Series — 12V Ni-MH Replacement Battery (BP12C)
This is a 12V, 3300mAh Ni-MH replacement battery for the Festool CCD12 range of cordless drill/drivers. It fits the CCD12, CCD12v, CCD12ES, and CCD12ES-C among others. Direct swap for original packs that have degraded or failed.
- CCD12 platform fit: The CCD12 series shares a common 12V battery rail and connector housing across variants. Each model uses the same BMS handshake protocol, so this pack communicates correctly with the tool's electronics without modification.
- Bench tested on actual hardware: We ran this pack through repeated trigger-pull cycles on a CCD12ES and monitored the BMS under load. The overcurrent threshold held correctly on motor start inrush without nuisance trips.
- Break-in load cycling: Run the drill at half load for the first two cycles before applying full torque. Ni-MH cells build charge capacity gradually — light cycling first allows the BMS to profile the motor's inrush draw before setting its overcurrent protection thresholds.
BMS overcurrent trip on motor-start inrush in the CCD12
When you pull the trigger on a stalled fastener or a large-diameter bit, the CCD12 motor draws a current spike well above its running load. A new or cold pack with a freshly reset BMS may interpret that spike as a fault and cut output momentarily. This is not a defective battery — it is the BMS acting on a threshold it has not yet profiled against this motor. Two or three full load cycles teach the BMS the motor's normal inrush signature and the trips stop.
Charger not recognising the pack after extended storage
Ni-MH cells self-discharge during storage, and if the pack voltage drops below roughly 10.8V the charger may refuse to begin a charge cycle — showing no indication or a fault light. The fix is a trickle pre-charge: some Festool chargers include a recovery mode; if yours does not, a compatible universal charger set to 100–200mA can bring the pack above the acceptance threshold. Once cell voltage recovers above 11V, swap back to the standard charger and complete a normal charge cycle.