Pure Clean PUCRC25 Robotic Vacuum Replacement Battery 11.1V 2600mAh

Pure Clean PUCRC25 Series — 11.1V Li-ion Replacement Battery (18650-3S15)

This is an 11.1V 2600mAh Li-ion replacement battery for the Pure Clean PUCRC25, PUCRC25_0, and PUCRC26B robotic vacuum cleaners. It uses OEM part number 18650-3S15 and slots directly into the battery compartment on these models. Capacity is 2600mAh (28.86Wh) — matching the original specification.

• PUCRC25, PUCRC25_0, PUCRC26B compatibility: These three models share the same 11.1V three-cell battery architecture, connector pinout, and BMS handshake requirements. A single 18650-3S15 pack serves all three without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the PUCRC25 platform. The BMS accepted the charger handshake without fault codes, and the motor control circuit drew current at rated levels across hard floor and carpet transitions.
• Dock charging habit on robotic vacuums: Do not leave the PUCRC25 sitting on the charging dock permanently. These robots on continuous dock power develop capacity fade faster than units charged only when the battery is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

This happens when the battery's internal resistance has climbed enough that voltage sags under motor load — even though resting voltage still reads acceptable to the indicator circuit. The PUCRC25 motor draws a sharp current spike on carpet transitions and when suction is partially restricted by a full filter. That spike pulls cell voltage below the motor controller's operating threshold momentarily, reducing fan speed before any low-battery warning fires. Fitting a fresh pack with low internal resistance eliminates the sag. Clean the filter first — a blocked filter forces higher sustained current draw and will reproduce the symptom even with a new battery.

Motor cuts out mid-clean then restarts on its own

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked brush roll, clogged filter, or debris jammed at the intake — the motor works harder to maintain airflow and sustained current climbs above the BMS trip threshold. The BMS cuts output to protect the cells, the vacuum pauses, and once current demand drops the BMS resets and the motor restarts. Clearing the restriction is the fix. If the cut-outs continue after cleaning the filter and brush roll on a new battery, check the intake path for a partial blockage the brush roll inspection misses.