Media P3 Replacement Battery 21.6V 2000mAh BP21625A

Midea P3 / P5S / P5 Pro / P81 — 21.6V Li-ion Replacement Battery (BP21625A)

This is a 21.6V, 2000mAh (43.2Wh) lithium-ion replacement battery for Midea cordless stick and handheld vacuums. It fits the P3, P5S, P5 Pro, and P81 models, along with two additional variants in the same platform family. OEM part numbers covered are BP21625A and MB2420A.

• P3 / P5 platform compatibility: These models share the same 21.6V battery rail, connector pinout, and BMS handshake protocol. One cell fits all listed models because the power management hardware is common across the platform — Midea carried the same battery architecture through the P3 through P81 range.
• Bench tested on actual hardware: We cycled this battery under simulated motor load on the P3 platform. The BMS engaged overcurrent protection correctly during sustained high-draw pulls, and cell voltage held within expected range across the discharge curve.
• Dock charging habit on stick vacuums: Do not leave the vacuum sitting on the charging dock permanently. Continuous trickle charge from the dock degrades lithium-ion cells faster than regular charge-and-remove cycles. Charge to full, then pull it off the dock.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when the motor is working harder than rated — usually because airflow is restricted by a blocked filter or partial clog. The motor draws more current under restriction, which causes voltage to sag at the cell level before the battery is genuinely depleted. The indicator reads the pack voltage, not the motor load, so it lags behind what the motor is actually experiencing. Check and clean the filter first — a clean filter is the fastest fix for premature suction drop.

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

This is a BMS overcurrent trip, not a dead battery. When sustained suction restriction forces the motor to pull above the BMS current threshold, the pack shuts off to protect the cells. The BMS resets after a brief cooldown — typically once current demand drops and internal temperature stabilises. Clear any blockage in the nozzle, hose, or filter before resuming. If cut-outs persist with a clean filter and clear airflow, check that cell voltage at rest is above 19V — below that, the pack may be too depleted to handle motor-start surge.