Sichler NC-5725-919 Replacement Battery 14.4V 2000mAh Ni-MH

Sichler NC-5725-919 / PCR-2000 / PCR-3550UV — 14.4V Ni-MH Replacement Battery

This is a 14.4V 2000mAh Ni-MH replacement battery for the Sichler NC-5725-919, PCR-2000, and PCR-3550UV cordless handheld vacuum cleaners. It matches the original voltage rail and physical dimensions (134.70 × 45.50 × 45.80mm) so it seats correctly in the battery bay. Replace it when the existing pack no longer drives the motor through a full cleaning cycle.

• NC-5725-919, PCR-2000, PCR-3550UV compatibility: All three models run the same 14.4V motor platform and use an identical battery bay footprint. Swapping between them requires no adapter or wiring change — the connector and cell orientation are the same across the range.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on the vacuum motor circuit. The Ni-MH cells maintained stable voltage delivery under simulated carpet load, and the BMS held within normal cutoff thresholds without nuisance trips.
• Dock charging habit for Ni-MH cells: Ni-MH chemistry is particularly vulnerable to trickle-charge damage from permanent dock sitting. Charge fully, then remove the vacuum from the dock. Only return it to charge when the pack is genuinely depleted.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the battery can sustain at full voltage — the terminal voltage sags under load even though stored charge remains. On Ni-MH packs, this is an early sign of cell degradation, where internal resistance has risen enough to cause voltage drop under motor load. A partially blocked filter compounds the problem by forcing the motor to work harder, pulling higher current and accelerating the sag. Clean the filter first, then test again — if suction still fades early with a clean filter, the pack needs replacing.

Motor cuts out mid-use then recovers after a short pause

This is a BMS overcurrent trip, not a mechanical fault. When suction is restricted — by a blocked filter, a sealed nozzle, or heavy carpet pile — the motor stalls slightly and current spikes above the BMS threshold, cutting power. The BMS resets once current drops, which is why the vacuum restarts after a pause. Check and clear the filter before suspecting the battery. If trips continue with an unobstructed airpath, verify the pack voltage under load reads above 12V — sustained readings below that indicate cell fatigue.