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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.
A fully working 18v Dewalt Battery will only take 90 minutes to just over an hour to fully charge from going flat. This fully charged battery should last about 4 hours of use (depending on the load). So the answer is 1 hour.
I don't thinkk you got the motor aligned in the housing right. It sounds like it's in a bind causing the battery to over amp which shuts it down. The litium batteries have curcuits that detect overloads so you don't damage the battery. There are alignment guides in the housing and on the motor to help get it right.
Rechargeable batteries do have a lifespan, they won't recharge forever. If you have fully discharged the batteries then fully recharged them and they still don't have full power or they only last a couple minutes then they are done. If they won't charge or the charger shows them as defective, the only fix is to replace them.
It depends on the charger taht comes with this drill, the dumb charger will just keep on charging the batteries even when it if fully charge and does not sop, which will be bad for the batteries, the smart charger (more expensive and has electronics inside the charger) will go into floating charge when the batteries are fully charge which will prevent the batteries from being overcharged. If in doubt, remove it from the charger after overnight charging.
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.
Lithium batteries, like all rechargeable batteries have a limited life and can only be charged up fully a certain number of times before they build up resistance.
There is nothing in them that you can mend or refurbish. The only alternative is to buy a new battery.
leave the battery in the charger when you are not using the drill to fully charge them.
Try to use the batteries often like in the light or some other means to occasionaly dischage the batteries for the best battery life.
the battery's are most likely dead, (like the real dead) after many uses of rechargeable battery's they slow stop holding charge at all, make sure when you get a new rechargeable battery you fully charge it once and fully discharge it once this will increase batterys life time
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