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NiMh doesn’t mind being completely discharged, so they should charge up again. If they’ve gone completely completely flat though, sometimes the charger doesn’t recognise them because the voltage is too low. There is a little trick you can do to fool the charger into starting a charge but I cannot for the life of me remember how to do it. It can be done.
Jonny69
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Two rechargeable AAs - pretty old. I put them in the charger and it just showed blinking rather than charging. I left for an hour and still the same. They are Ni-MH. Likely to have just deteriorated and need to be disposed of? They must be 10+ years old.