Lithion-ion battery power level lights

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Forum topic by mandatory66 posted 06-17-2015 09:43 PM 850 views 0 times favorited 3 replies Add to Favorites Watch
View mandatory66's profile


202 posts in 3585 days

06-17-2015 09:43 PM

I just received a new Dewalt drill,when it arrived the battery power indicator lights lit up 2 levels. I charged the battery and the charger light quickly indicated full charge.(maybe 10 sec.) I placed the battery back in the drill and the power indicator lights sill indicated only 2 lights instead of 3 for a full battery. Are these indicator lights just a joke or do I have a bad battery.

3 replies so far

View robscastle's profile


8542 posts in 3659 days

#1 posted 06-17-2015 10:06 PM

Do an endurance run on it recharge it and see what happens it may not have obtained full capacity charge for some reason.
If it doesnt recover fully and the lights are not on (or shown some improvement) Note 1 try an equilavent battery and monitor the run times over similar work conditions.

If the test indicates a short life on the new battery it is in fact faulty. happens some times no excuse but its annoying considering the initial cost and inconvience of having to return it

Note 1 If there is a improvement but not 100% in the charge status try cycling it again

-- Regards Rob

View crank49's profile


4032 posts in 4426 days

#2 posted 06-17-2015 10:40 PM

Li Ion batteries will take a charge up to about 70% of capacity in about 10 minutes. Then another 20% in about 45 minutes. the last 10 % can take hours. Most chargers just go for the 85% to 90% charge in less than an hour and call that fully charged. The batteries also have about 30% capacity in reserve when they shut down. This is because the will self destruct if the voltage gets below a certain point.

It sounds like you either have a defective battery or a defective charger.

View altendky's profile


169 posts in 3665 days

#3 posted 06-17-2015 11:41 PM

Do the instructions say anything special for a first charge? Often a first charge is supposed to be a lot longer than a ‘normal’ charge. Certainly nothing at all happened in 10 seconds.

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