A cordless electric drill is only as good as its battery pack. Thus, it is wise to know how to properly charge the pack so that you get the best performance with each charge, longest run time between charges and longest life of the pack. There are a few best practices for charging that will give you all of these benefits.
Put a new Dewalt cordless drill battery on its charger for a minimum of 18 hours before using it for the first time.
Use the full capacity of the battery between charging for best results. Nearly all drill battery packs are comprised of either NiCd (Nickel Cadmium) or NiMH (Nickel Metal Hydride) cells, and both respond well to this method, which is the opposite of an automobile-type sealed lead battery. Simply put, as a rule of thumb, you should discharge completely and charge completely.
Do not leave a makita NiCd battery pack on its charger for more than 30 hours. They also will develop a memory that shortens the life between charges if you use it briefly and put it on the charger for short, "quick" charges. The full discharge and charge method is especially important for NiCd batteries.
Discharge a battery pack fully before storing it. Store in cool, dry place of moderate temperature so that it will respond well when it comes time to recharge it.
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John Sr. John Sr Holdes a electrical engineer degree & John Jr
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well what I like about Hoffas they use SANYO cells & they are 6 times better then the Chinese Cells. The other thing is they do not test any thing when they rebuild it is all NEW.. They also Have a toll free number 1-866-96- Hoffa
If people just look under "Batteries" in their yellow pages phone directory, they're likely to find local businesses that rebuild battery packs. I live in a relatively small city of just over 700 thousand people, and there are a half dozen companies here that rebuild battery packs. If you live near any major city, you won't have any trouble finding local companies that will rebuild your battery pack for you.
for that you might have to contact to a proper battery company...:)
spruce is right, most big box stores will have a battery bin, other wise most stores that sell electronics should have them as well