About this replacement
Makita BFT020F Series — 9.6V Ni-MH Replacement Battery (193176-1)
This is a 9.6V Ni-MH battery rated at 2200mAh (21.12Wh), replacing OEM part numbers 193176-1, 193301-4, 193531-7, and related variants. It fits the Makita BFT020F and BFT021F cordless screwdrivers, along with over 26 compatible models in the BFT series. The connector and cell arrangement match the original Makita 9.6V platform exactly.
- BFT screwdriver series compatibility: The BFT020F, BFT021F, BFT040F, and BFT080F all share the same 9.6V battery rail, connector latch geometry, and thermal cutout circuit. One battery fits across the platform because Makita standardised the pack interface for this compact screwdriver lineup.
- Bench tested on actual hardware: We cycled this pack on a BFT-series tool under intermittent fastening loads. The NTC thermistor handshake completed correctly on Makita OEM chargers, and the pack accepted charge without error flags through multiple cycles.
- Ni-MH break-in on screwdriver tools: On first use, run the screwdriver at half-torque for two full discharge-and-charge cycles before applying maximum fastening torque. This allows the cell chemistry to stabilise capacity delivery before you push the pack hard.
Charger blinking red on a new 9.6V Ni-MH pack after storage
Ni-MH cells self-discharge during storage. If a pack sits long enough, cell voltage can drop below the acceptance threshold most Makita chargers require to begin a normal charge cycle. The charger reads the low voltage as a fault and blinks red instead of beginning charge. To recover the pack, some chargers have a conditioning or trickle mode — engage it, or use a compatible charger that accepts packs down to 0.9V per cell before switching to full charge current.
Screwdriver bogs under load mid-cycle despite showing full charge
Voltage sag under load is the most common mid-cycle performance complaint on Ni-MH screwdriver packs. When contact resistance is high at the battery terminals or tool rail, the voltage drop under fastening load is amplified — the tool bogs or stalls even though the resting cell voltage looks fine. Clean the battery terminals and tool contacts with isopropyl alcohol, then check resting voltage: a healthy 9.6V pack should read at least 10.2V off the charger. Anything below 9.8V at rest after a full charge points to a weak cell in the pack, not a contact issue.