First, you should know your battery is a Ni-CD / NI-Mh or Li-ion battery. If it is a Ni-CD / NI-Mh battery, please fully discharged and fully charged it to prevent "Memory effect".
If it is a Li-ion battery, please charge it before you use it.
Please keep in mind that, please fully charge a battery when you store it. And, charge it again every two months.
If your old battery is dead, you can replace it with a new one.
Ryobi Power Tool Battery
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