Dented, swollen, or leaking battery
Do NOT use. It can burst and cause serious injury. Isolate and contact ENVO support with photos for urgent warranty action.
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The battery is not charging
Damaged charger / pins, battery cells imbalanced Check the battery voltage with a multimeter or on the display. Fully charged battery voltage should be around 54V
Battery does not lock properly
Incomplete installation of the battery, damage from forcing the battery to lock, battery bracket is misaligned Insert the battery completely and then apply lock. Do not apply force on the key, doing so may cause damage Check the bracket for dirt and ...
Battery stops charging or discharges quickly
Try another charger. Test battery on different D50/ST50 if possible. If battery at fault and <1yr, contact ENVO for warranty.