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Replacing NiCad cells in cordless drill pac

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Norm:
I would like to start replacing the cells in cordless drill pacs
I've already fixed one of mine (Craftsman 14.4v) and one of Tom's
both which seem to be sucessful will be undergoing test today to
be sure....like how many 1/2 inch holes I can drill thru the thickness
of a 2x4  before the voltage drops to a certain level (like 12 or 11 volts)
Stay tuned for results of this test....if you like the results and interested
in letting me fix one of your cordless drill paks contact me for details
by E-Mail.

Your only expense may only be shipping and handling.......
......so if interested .....just E-mail me?
Norm.

Norm:
Okay guys here are the results of that test....
I replaced the cells in my one of my 14.4 Craftsman cordless drill pac and charged it
as to normal max. about 16.2 and tried it out 17 3/4 inch holes in a hunk of 2x4
which seemed about like the performance I had when they were new.

Then next I tried Tom's Milwaukee drill pack also 14.4v but used my modified
drill with 4ft special cord and plug that hooks up to his drill pack....line voltage
drop ....well ...Yes! I could only drill 16 3/4 inch holes.



Notice the white cord going to the red pack and to the drill?
Norm.
Oh by the way when those batteries get down to 14.4 they are done
and ready for a recharge!

tomw:
Norm;

How do you think that new pack will react to the factory charger?

I guess the best thing to do is try it.

Can't wait to try it out and if it works I haver 2 or 3 more that are either flat out dead or so weak they are useless. Maybe I can find a way to allow more cells once I see how you did them. I have some PVC, Kydex and HDPE plastic I could maybe make an extender from that will stand up to the task.

Should work for my cordless drilling needs. I have a half inch corded drill for real jobs. Only got it about 18 months ago because the Milwaikees kept up with what I used a drill for other than the drill press until the batteries started dying. I also have one cable so I can hotwire them to a vehicle battery and then they are very powerful.

Weird reason I have 3 sets of that same drill. Bought one off FeeBay and when it showed up it was a lot of 3 sets. Seller did not want to pay return shipping so I kept them. And all the drills are still running fine 10 years later but only 2 of 6 batteries are still useable. The battery packs are not common and they want about $50 per so I haven't bought new ones. Rather invest in a more modern 18 volt setup with high tech batteries that are light and last long.

Thanks for the heads up.

Tom

Norm:

Here is how I adapted to charge your batt.
but sensor on your battery isn't what my smart charger wants
so it just slow charges and takes several hours to charge.
Can charge these at about 5 amps on regular 12 volt battery charger
but not safe have to watch very carefully .....guess maybe Ghurd's dump
controller would work with a battery charger.
My PedGen works but cuts in too late resulting in like pedaling downhill
would have to change to a higher ratio....
Well I've tried to make a sucess of this one so I'll charge it up real
good and hoping it works I'm always fearful I will goof up but I was more
meticulous than the last one ....I mean I really tried my best this time

and it seems to have paid off ....
Norm
will be sending it off in a couple of days....
charging it up and letting it set for a day...
Yours reads 15.3 mine reads 15.75 putting yours
on charge right now.....keep you posted.....today.
....Later  :)

Norm:
Here is how to replace the cells in a cordless battery pack.

First I check the voltage I usually charge about 10 in a series
string until each stack of 5 reaches 6.5

This is how they look prior to cutting them up as individual
cells.

Pulling apart to expose the connecting tab, the tab is cut in
half with scissors they are the then temporarily glued together
and then a small bridging tab is soldered across the gap.

Like this.
7 pairs required for an 18 volt pack.
This way leaves 1/2 tabs that you can solder connecting short
bridging tabs to later.
From here you can google plenty of links and u-tube videos on
how to replace cells.
I will continue with pics as I make up another replament cell pack.
Norm. 

 

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