Can You Overcharge a Golf Cart Battery?
Yes — and it's one of the most common causes of premature battery failure. Here's how it happens and how to prevent it.
How Overcharging Damages Batteries
Lead-acid (flooded / AGM): When a fully charged lead-acid battery continues to receive charge current, it undergoes electrolysis — the excess energy breaks water molecules in the electrolyte into hydrogen and oxygen gas. This causes:
- Electrolyte loss: In flooded batteries, water is literally boiled away (you'll hear bubbling)
- Plate damage: Continued gassing warps and corrodes the lead plates
- Capacity loss: Permanent reduction that doesn't reverse with rewatering
- Heat buildup: Which accelerates all the damage above
Sealed AGM batteries: AGM can handle some gassing through internal recombination, but extended overcharging overwhelms this and causes the case to swell and eventually rupture.
Lithium (LiFePO₄): Lithium cells are far more sensitive to overcharging. A quality BMS shuts off charging before overcharge voltage is reached — but a mismatched (lead-acid) charger may push voltage beyond the BMS threshold.
Signs Your Battery Was Overcharged
- Swollen or bulging case on any battery
- Excessive water loss in flooded batteries (requiring frequent topping up)
- Corrosion on top of batteries from acid misting during gassing
- Burning smell during or after charging
- Shorter-than-expected range despite full charge indicator
Prevention
TIGON Golf Carts stocks automatic smart chargers for all voltage systems. Call 1-844-844-6638 or visit any location for a charger matched to your cart.