About this replacement
Trifo MAX-P / MAX-S — 14.4V Li-ion Replacement Battery (P2051-4S1P-ZM)
This is a 14.4V 5200mAh (74.88Wh) lithium-ion battery pack for the Trifo MAX-P and MAX-S robotic vacuum cleaners. It replaces OEM part number P2051-4S1P-ZM directly. The pack powers the drive motors, suction motor, and onboard navigation hardware.
- MAX-P and MAX-S compatibility: Both models share the same 14.4V battery rail, connector pinout, and BMS handshake protocol, which is why one pack covers both. Swapping between these two units is straightforward — the cell fits the same bay and communicates with the same charge management circuit.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the MAX-P platform. The BMS correctly reported state-of-charge to the vacuum's onboard controller, and the protection circuits tripped at expected overcurrent thresholds during simulated blockage events.
- Dock charging habit for the MAX-P: Do not leave the vacuum sitting on the dock between cleaning sessions indefinitely. Continuous trickle charging through the dock accelerates capacity fade in lithium cells at this voltage. Charge to full, then remove the unit from the dock until the next use.
Suction dropping before the battery indicator reaches low
The MAX-P's suction motor draws significantly more current when the filter is partially blocked. That elevated draw causes the cell voltage to sag under load, even when the pack still reads mid-charge on the indicator. The vacuum's controller interprets the voltage sag as a near-depleted pack and throttles motor power. Clean or replace the filter first — if the problem persists with a clean filter, the original cell has lost capacity and the voltage sag is happening at true mid-charge.
Motor cutting out mid-run then recovering after a few seconds
This is a BMS overcurrent trip, not a power-off event. When the suction path is restricted — blocked brush roll, clogged filter, or debris in the inlet — the motor pulls sustained current above the pack's protection threshold. The BMS disconnects the output to protect the cells, then resets after a short cool-down. Clear the obstruction, check the brush roll for hair wrap, and confirm the filter is seated correctly. If trips continue on a clean machine, verify the replacement pack voltage reads at least 16.0V off the charger before reinstalling.