Viomi V2 Pro 14.4V Cordless Vacuum Replacement Battery 2600mAh

Viomi V2 Pro Series — 14.4V Li-ion Replacement Battery (INR21700 50E-4S1P-CRL200S+)

This 14.4V 2600mAh Li-ion battery pack replaces the original power cell in the Viomi V2 Pro cordless stick vacuum. It fits the V2 Pro, V-RVCLMB21B, VXVC01-JG, and V-RVCLM26B — models that share the same 4S1P cell configuration and BMS connector. Capacity is 2600mAh (37.44Wh), matching the factory specification.

• V2 Pro platform compatibility: These Viomi models run the same 14.4V motor rail and share an identical BMS handshake protocol. The connector pinout and cell arrangement are consistent across the range, so the replacement battery communicates with the vacuum's charge circuit without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the V2 Pro platform, monitoring BMS cutoff behaviour under simulated motor load. Cell voltage balance across the 4S arrangement held within spec, and the charge circuit recognised the pack correctly on the first connection.
• Dock charging habit on the V2 Pro: Do not leave the V2 Pro sitting on its charging dock permanently. Continuous trickle charge degrades Li-ion cell capacity faster than normal use cycles. Charge fully, then remove the battery or vacuum from the dock until it needs charging again.

Suction dropping before the battery indicator reaches low

The V2 Pro motor draws harder when airflow is restricted — a partially blocked filter forces the motor to pull more current than rated to maintain suction. That extra draw causes voltage to sag across the 4S cell stack earlier than normal, making the vacuum feel like a weak battery when the real cause is a flow restriction. The BMS reads the sag as low capacity and dials back power delivery before the indicator light reflects it. Clean or replace the filter first — if suction normalises, the battery is not the issue.

Motor cutting out mid-clean and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage or a heavily loaded carpet, current draw spikes above the pack's protection threshold and the BMS disconnects the output to protect the cells. The brief pause you see is the BMS resetting after the current spike clears. Check the brush roll and filter for blockages before assuming the battery is at fault — if the motor runs clean after clearing the restriction, the pack is functioning correctly. If trips continue on an unobstructed vacuum, measure resting cell voltage: a healthy pack at full charge sits at 16.8V across the terminals.