Fromm P318 18V Replacement Battery 6000mAh Li-ion

Fromm P318 / P326 / P327 / P328 Series 18V Li-ion 6.0Ah Replacement Battery

This is an 18V lithium-ion battery rated at 6000mAh (108Wh), built to replace the original pack on Fromm P318, P326, P327, and P328 cordless strapping tools. The battery slots into the same port and communicates with the same BMS handshake the tool expects. Voltage and capacity figures match the original specification.

• P318 / P326 / P327 / P328 compatibility: These four Fromm models share the same 18V rail, battery connector footprint, and BMS communication protocol which is why one pack covers the full group. Swapping between them requires no adapters.
• Bench tested on actual hardware: We ran full charge and discharge cycles and monitored the BMS response during simulated motor-start inrush. The overcurrent threshold held correctly at trigger pull, and cell balancing completed without fault flags across all tested packs.
• Break-in on strapping tools: On first use, run the tool through two light-tension strapping cycles before applying maximum tension settings. This gives the BMS time to profile the motor inrush draw from the tensioning head before locking its overcurrent thresholds.

BMS cutoff on motor-start inrush during tensioning cycles

Cordless strapping tools pull a sharp current spike the moment the tensioning motor engages. On a new or recently stored pack, the BMS overcurrent threshold may not yet be calibrated to the motor’s inrush profile, causing the tool to cut out immediately on trigger pull. This is a protection trip, not a cell fault. Running two low-tension cycles first allows the BMS to log the inrush pattern and set a stable threshold before you apply full load.

Pack sits on charger but never advances past the red blink after storage

When a Li-ion pack sits unused for several months, cell voltage can drop below the charger’s acceptance threshold typically around 2.5V per cell. Most chargers interpret this as a faulty or incompatible pack and refuse to start a full charge cycle. To recover it, leave the pack on the charger for 1520 minutes without removing it; most charger firmware includes a trickle pre-charge stage that slowly brings cells back above the acceptance floor before switching to the main charge cycle. If the charger still shows red after 30 minutes, check that each contact pin on the battery is clean and making full contact oxidised pins will prevent the handshake voltage from registering correctly.