About this replacement
Bosch 13618-2G / BAT160 Series — 18V Ni-MH Replacement Battery (2 607 335 266)
This is an 18V, 3000mAh Ni-MH replacement battery for the Bosch 13618-2G cordless drill/driver and compatible 18V Bosch power tools. It matches the original cell count and voltage rail, so the tool's trigger response and torque output behave as expected. OEM part numbers covered include BAT160, BAT180, BAT181, BAT189, and 2 607 335 266 among others.
- 13618-2G and 1644 series compatibility: These models share the same 18V slide-pack form factor, connector pin layout, and BMS handshake protocol. Any battery that satisfies the voltage rail and thermistor signal on one will seat and communicate correctly on the others.
- Bench tested on actual hardware: We cycled this pack through repeated trigger-pull inrush events on a drill platform and monitored BMS overcurrent response. The protection circuit handled motor-start spikes without nuisance tripping under normal fastening loads.
- Motor inrush conditioning on first use: Run the drill at half load — driving standard screws, not lag bolts — for the first two charge cycles. This lets the BMS log the motor's inrush current signature before it sets its overcurrent trip threshold for high-torque applications.
BMS cutoff on motor-start inrush during high-torque trigger pulls
Ni-MH packs that have been in storage often present elevated internal resistance on the first few cycles. When you pull the trigger hard on a fresh or recently stored pack, the motor inrush current spike can exceed the BMS overcurrent threshold before the cells have warmed up. The BMS trips as a protective measure — the tool cuts out instantly, not gradually. Two or three partial-load cycles bring cell resistance down and shift the trip threshold back into a normal operating range.
Tool bogs under sustained load but doesn't cut out completely
This is voltage sag — not a dead cell. Under sustained motor draw, internal resistance causes the pack voltage to drop below the tool's stable operating range, and the motor loses torque without the BMS triggering a full cutoff. Check the battery terminal contacts on both the pack and the tool for oxidation or debris, as poor contact resistance amplifies sag. Clean contacts with isopropyl alcohol and test again. If sag persists after cleaning, measure resting pack voltage — a healthy 18V Ni-MH pack should read at or above 21V fully charged.