About this replacement
Hitachi C-2 / DS 14DV Series — 14.4V Li-ion Replacement Battery (327728)
This is a 14.4V, 1500mAh Li-ion battery for the Hitachi C-2 and DS 14DV cordless power tool range. It fits a broad range of 14.4V Hitachi tools including the CJ 14DL, DH 14DL, and 39 additional models sharing the same voltage rail and connector. Capacity is 21.6Wh as rated from factory spec.
- Multi-model platform fit: These Hitachi 14.4V tools share a common battery interface, BMS handshake protocol, and slide-lock connector. One cell pack covers drills, drivers, jigsaws, and rotary hammers across the platform — no adapters needed.
- Bench tested on actual hardware: We ran this pack under simulated drill motor-start inrush loads. The BMS held the overcurrent threshold without tripping on initial trigger pulls and balanced cell discharge across the five-cell series arrangement within normal variance.
- First two cycles on a new pack: On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS profile motor inrush current draw before it locks in its overcurrent protection thresholds — skipping this can cause false BMS trips on heavy fastening jobs.
BMS cutoff on motor-start inrush surge in Hitachi 14.4V drills
When a drill motor starts from rest, it pulls 3–5× its running current in the first 50–100ms. On a new or fully charged pack, the BMS may read that spike as an overcurrent fault and cut output. This is more common with rotary hammer models like the DH 14DL, where start-up torque demand is higher than a standard driver. If the tool clicks off on trigger pull, release the trigger, wait five seconds, then apply gradual pressure rather than full pull. That ramp lets inrush current stay under the BMS trip threshold.
Charger not recognising this pack after extended storage
Li-ion cells left unused for several months can drop below the minimum acceptance voltage — typically 2.5V per cell, or around 12.5V for this 14.4V five-cell pack. Most Hitachi chargers won't initiate a charge cycle below that threshold and will show a fault or simply sit idle. Remove the pack, wait 60 seconds, and re-seat it firmly — a poor contact can mimic a low-voltage refusal. If the charger still won't respond, check cell voltage at the battery terminals with a multimeter; anything above 10V per pack total can usually be recovered by a charger with a manual recovery or boost mode.