Solac AE2529 Replacement Battery 29.6V 2500mAh Li-ion

Solac AE2529 Series — 29.6V Li-ion Replacement Battery (S00001987)

This 29.6V lithium-ion battery pack carries a 2500mAh (74Wh) capacity and fits the Solac AE2529 and AE2529 2JG cordless vacuum cleaners. It replaces OEM part S00001987 when the original cell can no longer hold a working charge. Same voltage, same connector, same BMS communication as the factory pack.

• AE2529 and AE2529 2JG compatibility: Both models run the same 29.6V power rail and use the same BMS handshake protocol. The pack connector and cell count are identical across this variant pair, so one replacement covers both.
• Bench tested on actual hardware: We ran this pack through charge cycles on the AE2529 platform and monitored BMS cutoff behaviour under simulated motor load. The protection circuit responded correctly to sustained high draw and recovered without fault codes.
• Dock charging practice for the AE2529: Do not leave the vacuum on the charging dock permanently. Cordless vacuums kept on continuous dock charge develop capacity fade significantly faster than those charged only when the battery is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the AE2529

This is a voltage sag issue, not a capacity issue. When the filter is partially blocked, the motor works harder and draws more current than rated. That excess draw causes the cell voltage to sag under load, which the BMS reads as a low-battery condition even when the pack still holds charge. Clean or replace the filter first — if suction recovers and the battery indicator stabilises, the pack is not the cause.

Motor cutting out mid-clean then recovering after a short pause

This is a BMS overcurrent trip, not a failed battery. Sustained restricted airflow forces the motor to draw above the BMS protection threshold, which cuts power to prevent cell damage. The pack recovers once the BMS resets — typically within 30 to 60 seconds of the vacuum being switched off. Check the filter and brush roll for blockage before replacing the battery. If the cutout stops after clearing the restriction, the pack is operating as intended.