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I've been working on cordless tools of many brands for years and there are no individual parts available for batteries from any manufacturer nor any aftermarket parts retailers that I have ever found. Usually if you need these types of parts you have to scavenge them from other batteries.
If one contimues to use the pack after the tool starts to slow down one cell in the battey depletes and then reverse charges and then shorts, After that, that cell will not charge and the battery will only produce the rating minus 1.25 volts from that point. Unless you have the battery rebuilt it will never again take a full charge. Either replace or have rebuilt to solve the problem.
Depending on how old or more to the point how many times you have already charged the battery, it may be worn out. All rechargeable batteries do reach a point where they won't charge up anymore. If you have fully discharged the battery and tried to fully charge it up again and it won't take a charge or only lasts a few minutes on a charge it may be time to recycle it and buy a new one.
This is indicating the battery is too hot to charge, usually after coming off the tool right after some hard work. During the charging process the battey heats up so if you charge a hot battery, thereby making it hotter, you shorten the lifespan of the battery considerably. If you are getting a hot/cold pack delay indication on the charger, it should automatically start charging once the battery has cooled down sufficently.
Sometimes the charger needs to be reset! there is a procedure for tricking the charger into giving the battery a forced charge. Sometimes this will shock the cells back to life. It is a temporary fix! the thermistor inside of the battery may also be bad. Goto Http://www.Batterypartsonline.com the have the thermistors and any other parts you might need!
Try placing the battery in a freezer for six hours before trying to charge the battery and if this doesn't work find a friend with a working charger and make sure using that method that you don't just have a bad charger.
If you keep trying to charge it, it might do so. If this pack is still under warranty, get it replaced. If it is on your dollar, you can get the pack rebuilt with new cells for roughly $40 to $50 at: www.primecell.com I had a Skill drill pack rebuilt with Lithium ion cells that have half again the original charge longevity. Hope this helps!