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How To Tell If Rechargeable Batteries Are Charged. This indicates that the battery already have a full charge. Voltmeter which measures open circuit voltage is not a reliable method for evaluating rechargeable batteries and is not recommended for this purpose.
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If the light blinks red in about 90 seconds after battery insertion then the battery voltage is too low. You can tell that a battery is discharged by a sharp drop in power or speed. If the battery voltage indicator lights show the battery fully charged but you dont a reading of at least 18 volts on the multimeter the battery probably has a.
A fully charged Dewalt battery should read close to 20 volts.
Keep the contact of rechargeable batteries clean. The typical discharge level for rechargeable batteries is 10 to 11V and 11V is when I try to recharge my batteries both NiMH and NiZn. So here are several ways to tell if your cordless drill battery has gone bad. If charging is needed briefly drain the batteries before trying again.
