Cyklop CMT250 Replacement Battery 14.4V 4000mAh Li-ion

Cyklop CMT250 — 14.4V Li-ion Replacement Battery

This 14.4V 4000mAh (57.6Wh) Li-ion battery is a direct replacement for the Cyklop CMT250 electric strapping tool. The CMT250 is a cordless battery-powered strapper used in shipping and logistics to tension and seal plastic strapping around packages and pallets. When the original battery degrades, tensioning force drops before the gauge shows low — a fresh pack restores full motor output on the tensioning cycle.

• CMT250 compatibility: The CMT250 draws a sharp current spike at peak tension — the point where the motor stalls to lock the strap joint. The BMS on this pack is rated to hold through that spike without tripping, which is the critical threshold for strapping tool batteries at this voltage.
• Bench tested on actual hardware: We cycled this pack through repeated tensioning loads on the bench, including full-tension stalls. The BMS handled the inrush without nuisance tripping, and cell voltage recovered cleanly between cycles.
• Cold warehouse use: If the tool is stored in a loading dock or unheated warehouse overnight, bring the battery above 10°C before the first tensioning cycle of the day. Below that threshold, cold cells spike internal resistance enough that the motor's peak draw on a tight strap can trigger a BMS cutoff mid-cycle.

BMS cutoff during the tensioning cycle on the CMT250

The CMT250 motor pulls its highest current at the moment of maximum tension — the final stall before the joint welds. This peak can exceed the BMS overcurrent threshold on a cold or partially discharged pack, causing an abrupt shutoff mid-strap. The BMS reads this spike as a fault condition, not a normal load, and cuts the output rail. To recover, release the tension trigger, wait five seconds for the BMS to reset, then re-engage with the pack at or above 14.0V resting voltage.

Charger showing a fault light on a new or stored pack

Li-ion packs that have sat in storage for several months can drop below the charger's acceptance threshold — typically around 10V for a 14.4V pack. The charger detects the low cell voltage and flags a fault rather than beginning the charge cycle. This is a protection response, not a sign of a dead battery. Place the pack on the charger, wait 10–15 minutes, and remove it, then re-seat it firmly — many chargers will re-attempt acceptance once the pack stabilises above the detection floor.