About this replacement
Gardena Walk-Behind Lawnmower — 18V Li-ion Replacement Battery
This 18V 3000mAh (54Wh) Li-ion battery replaces the PBA 18V series packs used in the Gardena PowerMax 32/36V walk-behind lawnmower and compatible P4A platform tools. The PowerMax 32/36V runs on dual 18V batteries to deliver its 36V cutting power, so a failing cell in either pack pulls the whole mower down. Voltage and capacity match the original spec exactly.
- P4A platform compatibility: Gardena's POWER FOR ALL ALLIANCE system standardises the 18V rail, connector, and BMS communication across the PowerMax 32/36V, TCS 20, HandyMower 22/18V, and 69-plus additional models — one battery works across the range.
- Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage steady under load and tripped cleanly at the low-voltage cutoff without dropping into protect-lock unexpectedly.
- First charge before use: Li-ion cells ship at partial charge for transport safety. Run a full charge cycle before the first mow so the BMS can calibrate its state-of-charge tracking accurately.
How the dual-battery 36V system affects individual pack health
The PowerMax 32/36V draws from two 18V packs wired in series to reach its 36V operating voltage. If one pack degrades faster than the other, the weaker cell group limits total output. Replacing only the weaker pack restores balance. Running both packs at similar cycle counts extends the overall service life of the set.
Mower cuts out mid-lawn — what's happening and how to fix it
Abrupt shutdowns during mowing usually mean the BMS hit its low-voltage cutoff under the high current draw of dense or wet grass. The cells haven't failed — the protection circuit tripped correctly. Let the battery rest for ten minutes, then recharge fully before continuing. If the cutout happens earlier each session, the cells have lost capacity and replacement is due.