Atlas Copco LokTor H18 18V Replacement Battery 2000mAh

Atlas Copco LokTor H18 / P18T / S18P — 18V Li-ion Replacement Battery

This is an 18V, 2000mAh (36Wh) Li-ion replacement battery for the Atlas Copco LokTor cordless torque wrench series. It fits the LokTor H18, P18T, P18TX, and S18P, along with eight additional models in that line. The battery slots into the tool's standard battery bay and communicates with the onboard BMS to enable controlled-torque operation.

• LokTor series compatibility: The H18, P18T, P18TX, and S18P share the same 18V power rail, connector footprint, and BMS handshake protocol. Atlas Copco unified these across the LokTor range so one battery pack covers the full platform without adapter hardware.
• Bench tested on actual hardware: We cycled this pack through repeated torque-pulse sequences and monitored the BMS for overcurrent trips during motor-start inrush. The protection circuit tracked current spikes without nuisance cutoffs under normal fastening loads.
• LokTor motor-start conditioning: On first use, run the tool at half load for two cycles before applying maximum torque. This allows the BMS to profile the motor's inrush current draw and set overcurrent thresholds before you push the tool to its torque limits.

BMS cutoff on trigger-pull inrush in precision torque tools

Cordless torque wrenches draw a sharp current spike the moment the motor engages — this inrush can be three to five times the steady-state draw. If the BMS has not yet profiled the motor's inrush signature, it may interpret that spike as a fault and cut power before the fastening cycle completes. A new or recently stored pack is most vulnerable because the BMS starts with conservative default thresholds. Running two partial-load cycles recalibrates those thresholds to the actual motor profile.

Charger not recognising a new pack after storage

Li-ion cells self-discharge during storage, and if voltage drops below approximately 2.5V per cell, most chargers will not begin a charge cycle — the pack looks dead even though the cells are recoverable. Atlas Copco chargers typically show a blinking red LED in this state rather than a solid charge indicator. Some chargers include a recovery or "wake" mode that applies a low precharge current to bring cells back above the acceptance threshold. If your charger lacks that mode, a compatible charger with a precharge function will restore the pack — target 3.0V per cell before switching to normal charge.