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Leaving Batteries on Charger

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Forum topic by DMiller posted 08-08-2017 06:46 PM 852 views 0 times favorited 25 replies Add to Favorites Watch
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DMiller

251 posts in 311 days


08-08-2017 06:46 PM

Topic tags/keywords: question drill-driver cordless batteries

Recently I have been wondering, is it a problem to leave your cordless tool batteries on the charger even after they are finished charging? I have Porter Cable drill set, and there are times where I forget to remove them after they are finished charging. Is this a problem? Will it limit the life of the batteries? Thanks!

-- Dale Miller Modesto, CA "I can do all things through him that strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."


25 replies so far

View Loren's profile

Loren

9631 posts in 3486 days


#1 posted 08-08-2017 06:52 PM

I doubt there’s harm in it with lithium
batteries. Modern chargers have circuitry
in them to prevent over-charging.

One of the worst things you can do it
put a hot battery straight from a tool
you’ve been using onto the charger.
That really cooks them.

View Ripper70's profile

Ripper70

613 posts in 746 days


#2 posted 08-08-2017 07:11 PM

It may depend on the charger/battery combo you’re using. Some of the PC chargers have overcharge protection to prevent the kind of damage that you’re concerned about. Check your models number and do a Google search to get the specifics.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View MrUnix's profile

MrUnix

6006 posts in 2037 days


#3 posted 08-08-2017 07:31 PM

Yup. Depends on the charger. One of my Makita chargers has a “T” at the end of the model #, indicating that its got a trickle charge function so you can leave them in after a full charge. The manual for my other one recommends removing the battery after charging. It’s all up to the charger and how smart it is.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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splintergroup

1702 posts in 1060 days


#4 posted 08-08-2017 07:50 PM

I place my chargers on an old mechanical type light timer set to only run for 1 hour per day. This keeps the batteries topped up, but prevents any possibility of long-term overcharging. It also saves a small amount of power based on testing.

View Karda's profile

Karda

817 posts in 392 days


#5 posted 08-08-2017 07:54 PM

I have an 18v drill from HF, the battery takes 3-5 hours to charge, manual says charging for more than 7 hours will damage the battery

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Redoak49

2902 posts in 1826 days


#6 posted 08-08-2017 08:02 PM

I wired up an outlet with an electronic bathroom fan timer and set it for 60 minutes which charges any of my lithium batteries.

View Gilley23's profile

Gilley23

389 posts in 220 days


#7 posted 08-08-2017 08:02 PM

Just using that HF battery will damage the battery.

View Fred Hargis's profile

Fred Hargis

4758 posts in 2331 days


#8 posted 08-08-2017 08:06 PM

The newer (quality) chargers have solved the problems associated with leaving them in there. I still use a setup from the NiCad days where I have all my chargers plugged into a power strip and the strip is plugged into a 7 day electronic timer. It turns on for 2 hours (I think, can’t remember) once each week so I didn’t worry about the overcharging. I could probably ditch that now, but it’s not doing any harm.

-- Our village hasn't lost it's idiot, he was elected to congress.

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hotbyte

989 posts in 2813 days


#9 posted 08-08-2017 08:09 PM

I’ve always put them directly on charger from tool…thanks for info on that not being good for them! I’ll have to develop habit of leaving them off for a spell and then putting on charger. Knowing me, I’ll remember a few days later when I need them again :(

Kind of unrelated, but we’ve bought a 40V blower and push mower (yes, mower) from Ryobi and they actually work pretty good. They have a chain saw that runs on 2 40V batteries.


I doubt there s harm in it with lithium
batteries. Modern chargers have circuitry
in them to prevent over-charging.

One of the worst things you can do it
put a hot battery straight from a tool
you ve been using onto the charger.
That really cooks them.

- Loren


View Loren's profile

Loren

9631 posts in 3486 days


#10 posted 08-08-2017 08:14 PM



I ve always put them directly on charger from tool…thanks for info on that not being good for them! I ll have to develop habit of leaving them off for a spell and then putting on charger. Knowing me, I ll remember a few days later when I need them again :(

Kind of unrelated, but we ve bought a 40V blower and push mower (yes, mower) from Ryobi and they actually work pretty good. They have a chain saw that runs on 2 40V batteries.

It’s the worst with the batteries in the larger
packs because the cells on the outside of
the cluster insulate the hot cells on the
inside. That’s why those Makita packs from
the drills with the long handles lasted so
long – it was just a stack of paired cells
so they dissipated heat well.

View plasma800's profile

plasma800

10 posts in 196 days


#11 posted 08-08-2017 08:17 PM

I didn’t read every post, maybe somebody already said this..

but I NEVER leave batteries on the chargers.

I had one melt over night into a steaming too hot to touch puddle of smoldering plastic and battery bits.. ever since then, I monitor all battery charging when I’m in the shop. If I leave the shop for any considerable time, I have one power strip that I flip off that pulls power from all chargers, and the LED lights on my miter saw station… it’s my shut down switch.

View DMiller's profile

DMiller

251 posts in 311 days


#12 posted 08-08-2017 08:18 PM

Thanks for the replies, guys! I really appreciate your answers!

-- Dale Miller Modesto, CA "I can do all things through him that strengtheneth me." Philippians 4:13. "Woodworking minus patience equals firewood."

View TaySC's profile

TaySC

270 posts in 171 days


#13 posted 08-08-2017 08:58 PM

It’s been maybe 10 years ago, but I ruined a Dremel battery by leaving it on the chrger around the clock. Thankfully, technology has improved and trickle chRogers should prevent that from happening.

View Jack Lewis's profile

Jack Lewis

208 posts in 916 days


#14 posted 08-08-2017 09:03 PM

I wonder how flashlight companies would feel if every company had a different shaped batttery? E.I. automobile manufactures. Same bitch about ink jet printers.

-- "Now we are getting no where, thanks to me"

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JackDuren

331 posts in 797 days


#15 posted 08-08-2017 09:41 PM

Leaving on trickle killed four of my dewalts…$70 ea

showing 1 through 15 of 25 replies

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