battery charging - mower

Depends on the type of battery, (lead, gel, l-ion) whether that voltage looks high.

Handbook ? , or give us model and make.


Here's a version that doesn't need electrics, or petrol

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I would guess your battery (assuming lead acid) is knackered. The regulators in most mowers need a load to keep the voltage down. 18.5 is a reasonable unloaded voltage.
 
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