Hitachi 12v cordless drill charger and batteries?

After 5 years of working my Hitachi cordless drill I have started to get a problem. The charger overheats and the batteries are heating up more than they used to. charging time becomes less each time they are charged up and they are going flat very quickly. I know I have had my moneys worth out of the drill but if... show more After 5 years of working my Hitachi cordless drill I have started to get a problem. The charger overheats and the batteries are heating up more than they used to. charging time becomes less each time they are charged up and they are going flat very quickly. I know I have had my moneys worth out of the drill but if this is some simple problem to repair, I would prefer not to buy a new one.
Buy a new one you tight fisted git would not be the answer I'm after.
Thanks in advance
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