About this replacement
GRE Electric Vac VCB10 / Wet Runner Series — 11.1V Li-ion Replacement Battery (P1111283BU)
This 11.1V 2600mAh Li-ion battery replaces the original P1111283BU pack in the GRE Electric Vac VCB10 robotic pool cleaner and the Wet Runner RBR120 and BRB75 models. All three share the same voltage rail, connector pinout, and BMS handshake protocol, so one pack covers the range. Capacity is 2600mAh (28.86Wh), matching the factory specification.
- Vac VCB10, Wet Runner RBR120 and BRB75 compatibility: These three models run the same 11.1V three-cell Li-ion architecture with identical motor drive circuits and BMS communication lines. The P1111283BU part number is shared across the platform, so the replacement pack negotiates charge and discharge cycles the same way the factory unit does.
- Bench tested on actual hardware: We ran this pack through charge acceptance and motor-start load tests, including the high-current spike the suction motor draws when the cleaner engages a debris-heavy section of pool floor. The BMS held cutoff thresholds steady and did not trip under repeated peak-draw events.
- Post-session terminal care: Rinse the battery housing with fresh water after every pool session before connecting the charger. Chlorine and salt residue on the terminals builds contact resistance quickly, and the cleaner's onboard diagnostics will read that resistance as a low-battery condition — causing false cutoffs that have nothing to do with actual charge state.
Why the Vac VCB10 stops mid-cycle when the battery is new
A new Li-ion pack sometimes trips the BMS during the first few cycles because the suction motor draws a sharp current spike when the cleaner transitions from open-floor travel to wall-climbing or heavy-debris suction. The BMS reads this spike as an overcurrent event and shuts the pack down to protect the cells. This is not a fault with the battery — it is the protection circuit behaving correctly on cells that have not yet settled into their full charge-cycle capacity. Running two or three full charge-to-discharge cycles on the new pack allows the cells to stabilise, after which the BMS spike threshold is met with headroom to spare.
Cleaner moves but suction motor feels weaker than expected
Reduced suction with normal drive movement usually means the pack voltage has sagged below the motor's rated drive point — even if the charge indicator shows green. Li-ion cells under partial charge deliver lower sustained voltage, and the suction impeller is the first load to show the effect because it runs at higher current than the drive wheels. Take the cleaner out of the water, charge the battery to full, and confirm the charger LED has gone solid before the next cycle. A fully charged 11.1V pack should read between 12.4V and 12.6V at the terminals before it enters the water.