Wolf Garten Power 37 36.5V Compatible Battery 4949066

Wolf Garten Power 37 / Power 40 — 36.5V Li-ion Replacement Battery (4949066)

This is a 36.5V, 6000mAh (219Wh) lithium-ion replacement battery for the Wolf Garten Power 37, Power 40, Hybrid Power 37, and Hybrid Power 40 cordless lawn mowers. It slots into the same battery bay and uses the same connector as the original Wolf Garten pack. Capacity figures come from the product data — not third-party claims.

• Power 37, Power 40, and Hybrid variants: All four models run the same 36.5V battery rail and share the same physical housing and BMS handshake. One battery covers the full range — no adapter or modification required.
• Bench tested on actual hardware: We ran this pack through repeated blade-motor start cycles and monitored the BMS response to inrush current. The protection circuit held stable across simulated thick-grass load spikes without nuisance tripping.
• Seasonal storage preparation: Before putting the mower away for winter, run the pack to around 50% charge — not flat. Li-ion cells left at near-zero voltage over several months can drop below the BMS acceptance threshold, and the charger will reject the pack come spring.

BMS cutoff under thick-grass or wet-grass blade load

The blade motor on the Power 37 draws a sharp inrush current every time it bites into dense or wet grass. If the pack's state of charge is already low, the BMS reads that current spike as an unsafe discharge rate and cuts the output. This is a protection event, not a battery fault. Let the mower sit for 30 seconds, then restart — the BMS resets once the current demand drops. If it trips repeatedly, charge the pack before the next run rather than starting on a partial charge.

Charger refusing to accept the pack after winter storage

Li-ion cells that self-discharge below roughly 2.5V per cell over a long storage period will be rejected by the Wolf Garten charger — the charger sees a voltage too low to safely initiate a charge cycle. Some chargers have a recovery or "wake-up" mode that trickle-charges the pack back above the acceptance threshold. If yours does not, a short connection to a compatible Li-ion charger at its lowest current setting for 10–15 minutes can bring cell voltage back above 3.0V per cell, after which the original charger will accept it normally.