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rebuilding cordless drill batteries
Topic Started: Dec 13 2013, 04:29 PM (1,616 Views)
bansheetaz


anyone ever sent some batteries out for refurbish? where did you send them and how was there performance based on price. i have 3 dewalt 18vs doing me no good anymore.

thoughts.

thanks
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shaft
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I tried this method http://www.youtube.com/watch?v=RVUywCBpmng

But instead of using drill batteries, I used my Cummins Ram truck with 2 batteries. You will see sparks flying when you tap the battery terminal. It actually got 2 of the 3 Dewalt dead batteries working again. I guess this method can only do so much.
Edited by shaft, Dec 13 2013, 05:52 PM.
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DesmondGhostRider
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Ive "sparked" batteries with leads on a welder and it ce back to life
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bansheetaz


Well they aren't fully dead. They just don't have power for very long and they charge really fast. I've had them for awhile though.
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sphenicie


I have opened up the battery pac. it is nothing but 12, 1.5v, C size, batteries with a connection ?soldered? to the top and bottom. if you have the time to piss around with it, you could get 12 rechargeable batteries,
open it up, swap and redo. unless you have a good source for rechargeables, it will cost damn near the same, as a new pac.
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bansheetaz


I did the welder trick. Seemed to help a lot. I will do it again in a week or so. Might be a maintanence thing periodically
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94RHDRollerskate
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Forum Stud Muffin

Wonder if I can do the trick with just my Jeep's one Optima battery? One way to find out.
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JellyBeanDriver


sphenicie
Dec 15 2013, 07:00 AM
I have opened up the battery pac. it is nothing but 12, 1.5v, C size, batteries with a connection ?soldered? to the top and bottom. if you have the time to piss around with it, you could get 12 rechargeable batteries,
open it up, swap and redo. unless you have a good source for rechargeables, it will cost damn near the same, as a new pac.
That's common, Nicad sub-C sells. In the effort to make high current packs, also with high capacity, the separators get really thin so self discharge is high. My Dewalt 12V pack even when new wasn't so great. Now they don't last but a day after coming off the charge and not using it.

Bought a refurb Hitachi 18V Lithium ion cordless drill. Should have done it earlier. Battery lasts for months between charging (have yet to see it self discharge to nothing). Lasts a long time in use and is lightweight. There is no taper of charge though - the protection circuitry is a hard cutoff when the pack is low.

Google or ebay search 'battery back rebuild service' and you'll find some hits. Given the xmas season, you might want to just treat yourself to a new Lithium ion pack drill. try and get something with the most packs though - they're expensive.
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Dattman
Express Shopper

I've had a 24v pack repacked, it's expensive but the pack went from 1.3ah to 2.6ah, that was the cheapest sub c cell available, I was concerned about the charger but it turns out most nicad/nickle metal chargers charge until the cells reach a certain temperature then switch off, so no charger issues it just takes a bit longer as the battery pack is twice the capacity.

Unless you have several tools that use that battery pack or is some unusual tool that is no longer made I wouldn't recommend repacking it, just put the money towards getting something newer with Lithium Ion batteries, very low rates of self discharge means it will still have charge when you go to use it.

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Hanuman
"The Almighty Grounds Cleaner"

remember to store your lithium ion battery packs at half charge when not in use. this includes your laptops!

lithium ion batteries dont like to sit at a full charge, it decreases there life.
the cut off circuit is there because they can be drained down to like 10% with out issues, but below that point the life rapidly decreases....hence the protective cut off circuit.
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Hanuman
"The Almighty Grounds Cleaner"

i have a bunch of ryobi 18 volt tools, and the crappy batteries dont last long......the problem is the battery charger charges to fast reducing the life span quickly. they are expensive and even new provide poor performance.

my solution? MOT.
ill rewire a microwave oven transformer to out put 18-20 volts and 12 gauge wire......some of the tools draw 11 or more amps!

now i know what your thinking, thats gonna be a heavy set up, and its a little big to fit inside a gutted battery pack, so ill mount the MOT in a box, and run a cord to the hollowed out battery pack.
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Coche Blanco
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Troll Certified

Hanuman
Dec 21 2013, 01:25 AM
i have a bunch of ryobi 18 volt tools, and the crappy batteries dont last long......the problem is the battery charger charges to fast reducing the life span quickly. they are expensive and even new provide poor performance.

my solution? MOT.
ill rewire a microwave oven transformer to out put 18-20 volts and 12 gauge wire......some of the tools draw 11 or more amps!

now i know what your thinking, thats gonna be a heavy set up, and its a little big to fit inside a gutted battery pack, so ill mount the MOT in a box, and run a cord to the hollowed out battery pack.
Hmmm...for some reason something doesn't jive here. Why not just use a corded tool to begin with? Because you've already invested in cordless?
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iamgeo
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Big League

I've been waiting for someone to post this. I guess no one else knows about it.

Rambo Battery
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pdqrunner


This place is around the corner from me. Great folks. Give them a call they will answer all your questions.
http://www.bulldogbattery.com/
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Hanuman
"The Almighty Grounds Cleaner"

Coche Blanco
Dec 21 2013, 01:27 AM
Hanuman
Dec 21 2013, 01:25 AM
i have a bunch of ryobi 18 volt tools, and the crappy batteries dont last long......the problem is the battery charger charges to fast reducing the life span quickly. they are expensive and even new provide poor performance.

my solution? MOT.
ill rewire a microwave oven transformer to out put 18-20 volts and 12 gauge wire......some of the tools draw 11 or more amps!

now i know what your thinking, thats gonna be a heavy set up, and its a little big to fit inside a gutted battery pack, so ill mount the MOT in a box, and run a cord to the hollowed out battery pack.
Hmmm...for some reason something doesn't jive here. Why not just use a corded tool to begin with? Because you've already invested in cordless?
all of the ryobi tools i also have in corded......except for one.......i have no working corded drills, or impact drills.
i do have a pneumatic impact wrench for the serious shit....but then i have to bring out the compressor and all that.....

plus i would like to have a hammer drill....i could buy a corded one.....they aint cheap.....or buy the 18volt ryobi one for 69$

so for a hours work i can have 2 drills, and a impact drill operational. i also have a smaller 9.6 volt and a 12v drill. not hard to run 12/3, and reduce the turns on 2 of the wires for the smaller drills.
currectly, i have 9 battery powered tools that are shelf ornaments.

also, unlike a battery that starts dropping power and continues loosing voltage as you operate.....a transformer will supply the same out put voltage.
plus, i can send 19 or 20 volts to give my tools even more juice if i want.
Edited by Hanuman, Dec 24 2013, 02:30 AM.
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