Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
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When a cordless tool has had little use for a long time, it usually results in the battery failing. The simple solution to that is to buy a new battery.
Some useful information for increasing battery lifespan is here:https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Hm. I take your point, but I've had batteries that appear to show a full charge, but that provide almost no power. The difference in your case appears to be that the battery provides zero power, ergo the tool could be faulty.As a suggestion, you could buy the following item very cheaply, and eliminate the battery from suspicion.https://www.ebay.co.uk/itm/175370020204