Hitachi EB1412S 14.4V Ni-MH Replacement Battery 3300mAh

Hitachi C-2 / EB 1412S Series — 14.4V Ni-MH Replacement Battery

This is a 14.4V 3300mAh Ni-MH replacement battery for Hitachi cordless power tools. It fits the C-2, CJ 14DL, DH 14DL, G 14DL, and over 40 additional models that share the 14.4V Ni-MH battery platform. OEM part numbers covered include EB 1412S, EB 1414, EB 1420RS, EB 1426H, EB 1430H, and several more in the EB 14 series.

• 14.4V EB-series platform compatibility: These models share a common 14.4V rail, identical battery housing geometry, and the same connector pinout. The BMS handshake is consistent across the EB 14 line, so one battery pack covers drills, impact drivers, rotary hammers, and grinders in this voltage class.
• Bench tested on actual hardware: We cycled this pack on a Hitachi 14.4V drill under load. The BMS held the discharge curve steady through repeated trigger pulls, and the overcurrent protection reset correctly between cycles without nuisance trips.
• Motor-start conditioning on first use: Run the tool at half load for two cycles before pushing it to full torque. This lets the BMS profile the motor's inrush current draw and set overcurrent thresholds correctly before you hit maximum demand.

BMS cutoff on motor-start inrush surge in Hitachi 14.4V tools

Ni-MH cells have lower internal resistance than older Ni-Cd packs, but the BMS still sets an overcurrent threshold based on expected inrush. On rotary hammers and circular saws, the motor-start spike can exceed that threshold momentarily, tripping the protection circuit. This is more likely if the pack has been sitting discharged or is being used in cold conditions where cell resistance climbs. If the tool cuts out on the trigger pull and recovers after a second, the BMS has tripped — not the motor. Let the pack rest for 30 seconds and try again at reduced load first.

Charger not recognising this pack after storage

Ni-MH cells self-discharge during storage, and if a pack sits long enough, cell voltage can drop below the charger's acceptance floor. Hitachi 14.4V chargers typically reject packs reading below around 10V at the terminals. To recover the pack, apply a trickle charge manually with a compatible NiMH charger set to a low rate — around 100–200mA — until terminal voltage climbs above 10.8V. Once the pack registers in that range, the standard charger will detect it and begin a normal charge cycle.