Hi. The batteries for these things seem to go bad rather quickly when they are not used, but here is something to try..... So called "smart chargers" are what everything is going to. They analyze the condition of the battery and if everything is good, charge it. If everything is not good, according to the parameters of that charger, they don't. My suggestion is to take the battery out of the unit and try an old-fashioned analog battery charger for a little while, set to the proper voltage for the battery, of course, and monitored closely to measure the effects. If the batteries seem to take a charge, put them back in and run it a bit, then try the on-board charger again, just don't wait until the batteries are completely drained this time.
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