About this replacement
Water Tech Pool Blaster Max CG — 9.6V Ni-MH Replacement Battery (9630-BHPB)
This is a 9.6V 3000mAh Ni-MH replacement battery for the Water Tech Pool Blaster Max CG cordless pool vacuum. It replaces OEM part number 9630-BHPB directly. The Pool Blaster Max CG uses this battery to drive the suction motor through a full cleaning cycle without a cord.
- Pool Blaster Max CG fit: The Max CG runs a 9.6V motor rail matched to this cell count and pack geometry. Voltage, connector type, and pack dimensions — 92.70 x 85.65 x 26.00mm — all align to the OEM specification, so the pack seats and locks without modification.
- Bench tested on actual hardware: We ran the pack through a discharge cycle under simulated motor load. The BMS held current delivery steady until the low-voltage cutoff tripped cleanly, with no mid-cycle dropout or thermal event.
- Dock charging on the Max CG: Do not leave the vacuum sitting on the charging dock when the cycle is complete. Ni-MH cells in cordless pool vacuums develop capacity fade faster under continuous trickle charge than cells charged only when depleted. Charge to full, then remove.
Suction dropping before the battery indicator reaches low on the Pool Blaster Max CG
This happens when the filter is partially blocked and forces the motor to draw more current than its rated load. The extra draw causes voltage to sag at the cells before the pack is genuinely depleted, so the indicator looks fine but suction falls off. The BMS reads the sag as a low-power condition and throttles output to protect the pack. Clean or rinse the filter first — if suction recovers immediately, the battery was not the cause.
Motor cutting out mid-clean and then recovering after a short pause
This is a BMS overcurrent trip, not a failing battery. When the intake is blocked or the filter is clogged, the motor works harder against restricted flow and pulls current above the pack's trip threshold. The BMS shuts output down to protect the cells, then resets once temperature and current drop. Clear the blockage, check the filter mesh for debris buildup, and confirm the intake path is unobstructed before resuming — the pack should hold steady at or above 9.6V under normal load.