About this replacement
Gardena Lawnmower — 18V Li-ion Replacement Battery
An 18V 5000mAh (90Wh) lithium-ion battery built for the Gardena PowerMax 32/36V lawnmower and other tools in the POWER FOR ALL ALLIANCE ecosystem. The PowerMax runs a 32cm cutting deck and draws from the shared 18V platform common across multiple brands and garden tools. One battery, many compatible devices.
- Cross-brand P4A compatibility: These models share the same 18V rail, connector standard, and BMS communication protocol used across the POWER FOR ALL ALLIANCE — that is why one pack covers Gardena, Bosch, and other P4A tools on the same platform.
- Bench tested on actual hardware: We ran full charge/discharge cycles on P4A-compatible tools — the BMS held voltage steady under load and tripped the low-voltage cutoff cleanly without a hard shutdown event.
- First charge before mowing: With Li-ion, condition the pack with a full charge before the first use — this lets the BMS calibrate the state-of-charge window accurately from the start.
How the 90Wh capacity maps to a 32cm cutting deck
The PowerMax 32/36V draws harder on dense or wet grass because the motor adjusts torque to maintain blade speed across the 32cm width. A 90Wh pack gives the motor headroom to handle those peaks without immediately stressing the low-voltage cutoff. Gardena rates up to 480 square metres per charge using their higher-capacity packs — actual area covered varies with grass condition, terrain, and collection load.
Battery shows full charge but the mower stops mid-run
This usually means the BMS is tripping on a voltage sag spike, not actual depletion. On a cutting deck this wide, a sudden load — thick clippings blocking the blade — causes a momentary current surge that the BMS reads as an unsafe drop. Clear the deck, let the pack rest two minutes to recover surface voltage, then restart. If it happens repeatedly on light grass, the pack's internal resistance may be too high and replacement is the correct fix.