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Hello Howard, There are two different kind of cordless drill chargers. One is a smart charger that will not overcharge your battery. It usually has a stand alone base that the battery plugs into and sometimes may have a red and/or a green light to let you know it is charged. This charger will stop charging when the battery is fully charged after an hour or less. The other one is a dumb charger that can overcharge your battery if left on the charger too long. This charger usually has a square or rectangular transformer that plugs directly into your wall receptacle. This charger may take up to eight hours to fully charge your battery and will continue to charge until you unplug it.
Jo, nope you are safe. Most of the chargers are designed to cut off and go into trickle charge once they sense that the batteries are fully charged. The problem with overcharging comes after 18 hours or so. You should never leave the charger plugged into the chair for more than 24 hours. On the M51 the charger is built into the chair so just plug it in when you go to bed and unplug it when you get up and you'll be ok. You can check for full charge by looking at the charger there should be a red light and a green light when fully charged. Hope this helps
If it is not charging because the charging port is broken, you should go onto Ebay and buy a three dollar universal phone charger. It charges the battery outside of the phone, so a broken port can be ignored. Also, buy another battery so that you can rotate them out every 12 hours. This is the cheapest solution possible, costing under ten dollars to fix completely.
i did the same and got very annoyed i'd broken it. pretty much gave up on it until i needed a date from the calender some months later and once the battery had drained it seemed to fix itself.
i now only charge it for an hour or two at a time
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