Bosch 3300K 12V Ni-MH Replacement Battery 2607335055

Bosch 3300K / 3305K Series — 12V Ni-MH Replacement Battery (2 607 335 055)

This is a 12V, 3000mAh Ni-MH replacement battery pack for the Bosch 3300K, 3305K, 330K, and 3310K cordless tool series, along with 28 additional compatible models. It replaces OEM part numbers including 2 607 335 055, BAT011, BH1214L, and BH1214MH. The connector footprint and terminal layout match the original Bosch pack directly.

• 3300K and 3305K platform compatibility: These models share a 12V cell stack architecture with identical terminal spacing and BMS handshake voltage thresholds. The same pack services the full 330K-through-3310K range because Bosch held that rail constant across this generation of compact drivers and drills.
• Bench tested on actual hardware: We cycled this pack on a 3300K drill platform under load. The BMS handled inrush current on trigger pull without tripping, and cell balancing stayed within spec across five charge and discharge cycles.
• Ni-MH memory management on 3300K tools: Unlike Li-ion packs, Ni-MH cells in this series are susceptible to voltage depression from repeated partial discharges. Run the tool until it slows noticeably — do not top-charge after short use — to keep the cell capacity accurate and avoid false-low shutoffs from the charger.

BMS overcurrent cutoff on 3300K motor-start inrush

The 3300K's drill motor draws a sharp current spike the instant the trigger is pulled — this inrush can be several times the steady-state running current. A new pack's BMS may have conservative overcurrent thresholds before it profiles actual load conditions on the tool. If the pack cuts out immediately on trigger pull rather than under sustained load, the BMS has tripped on that spike. Running two partial-load cycles first allows the protection circuit to calibrate its overcurrent window to this motor's actual inrush signature.

Charger not recognising the new pack after storage

Ni-MH packs shipped from storage can sit at a resting voltage below the acceptance threshold Bosch chargers use to confirm a valid pack is connected. The charger sees a voltage too low to confidently begin a charge cycle and either blinks an error or does nothing. To recover, place the pack on the charger and hold light pressure on the contacts for 10–15 seconds — some chargers need a brief trickle contact to cross the recognition threshold. If the charger still refuses to engage, check that the resting cell voltage is above 10.0V with a multimeter before concluding a fault.