Best way to keep tool batteries charged and ready?

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Forum topic by Highlander599 posted 06-09-2010 09:28 AM 1260 views 0 times favorited 3 replies Add to Favorites Watch
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2 posts in 2944 days

06-09-2010 09:28 AM

I decided to set up a charging station for my tool batteries today. All of my tools are either Dewalt or B&D Firestorm ni-cad batteries (to poor for new lithiums). Most of the manuals say you can leave the batteries on the chargers all the time. I have “read about” but not “experienced” overheated batteries. I also tend to go several weeks without using them. Having them charge 24/7 seems like some sort of waste or overkill.

My question is I thought about putting the charging station on a simple lamp timer set to charge 1 hour per day. This should maintain a full charge but will it shorten the lifespan of the batteries? It seems much more logical to “trickle charge” over time. Am I right?

3 replies so far

View Greedo's profile


473 posts in 2985 days

#1 posted 06-09-2010 10:52 AM

i recently bought my first cordless tool so i have been wondering the same.
i think it is worse to let the batteries uncharged for a long time compared to regularely recharge them. at least with LiI, the manual of my Bosch drill says it has a protection so the batteries cannot overheat, or be fully discharged.
but maybe recharging them once a day is overkill, i would guess it is best to recharge them just before they get empty. so maybe test out each battery daily after loading it and see how long it goes without losing noticable power. then you know how frequently they should be recharged.
all this is just a guess though

View a1Jim's profile


117115 posts in 3602 days

#2 posted 06-09-2010 06:21 PM

Depending on are and type of battery the answer will differ I would suggest your owners manual should have the correct answer for you battery

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View Sawkerf's profile


1730 posts in 3093 days

#3 posted 06-09-2010 06:32 PM

I go thru batteries fairly quickly so I have a battery in the charger pretty much all of the time. I’ve done that for years with both Ni-Cad and Li-Ion batteries and don’t think that it’s made a lot of difference. Chargers usually shut off when the battery is charged and would work in a “trickle” mode if the battery is left in it.

-- Adversity doesn't build reveals it.

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