Atlas Copco PES7.2T Replacement Battery 7.2V 3300mAh

Atlas Copco PES7.2T — 7.2V Ni-MH Replacement Battery (BS2E7.2T)

This is a 7.2V, 3300mAh Ni-MH replacement battery for the Atlas Copco PES7.2T cordless drill/driver. It matches the OEM part number BS2E7.2T and fits the PES7.2T platform's battery bay and connector layout. Capacity is 3300mAh — confirmed from product data, not estimated.

• PES7.2T platform fit: The PES7.2T runs a 7.2V rail with a proprietary slide connector. This pack matches that voltage rail and connector pinout. A mismatch in either triggers a no-power condition — this pack avoids that.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the PES7.2T platform. The BMS handled motor-start inrush current without tripping on trigger pull, and cell temperature stayed within range under sustained rotary load.
• Break-in protocol for this tool: On first use, run the drill at half load for two cycles before full-torque applications. This allows the BMS to profile the motor's inrush current draw and set overcurrent thresholds accurately before heavy use begins.

BMS cutoff on the PES7.2T during motor-start inrush surge

When you pull the trigger on the PES7.2T, the motor draws a sharp current spike before it reaches running speed. On a new or cold pack, the BMS may read that spike as an overcurrent event and cut power before the motor even starts turning. Ni-MH chemistry handles inrush better than Li-ion at low temperatures, but a BMS that hasn't yet profiled the motor load will still trip conservatively. Running two break-in cycles at half load teaches the BMS where normal inrush sits, so it stops interrupting on full-trigger pulls.

Charger not recognising the new BS2E7.2T pack after storage

Ni-MH cells that sit discharged for extended periods can drop below the voltage threshold the charger uses to confirm a valid pack is connected. The charger sees a voltage too low to distinguish a real pack from a short, so it refuses to begin charging. Place the pack in the charger and watch for any response — even a brief blink — within the first two minutes. If there's no response at all, try a different Atlas Copco-compatible charger that supports a trickle pre-charge mode to recover cells sitting below 0.9V per cell.