How to check NiCd batteries


  #1  
Old 08-23-10, 01:26 PM
S
Member
Thread Starter
Join Date: Nov 2004
Location: north dakota
Posts: 170
Upvotes: 0
Received 0 Upvotes on 0 Posts
How to check NiCd batteries

I have a 14.4 cordless drill. Battery packs don't hold a charge very long.
I took the packs apart, found 12 SubC batteries in each. Found 3 cells
in each that had zero volt reading. OK, well maybe I can make one good
batt pack from the 12 best cells.

Charged battery packs again, drilled some holes in a 2X4, disassembled packs
again. Now one of the bad cells is OK (1.25) and a different one is zero volts.

How can I load test them or whatever to see which cells are good?
(If necessary, I can charge the cells individually).
SteveS
 
  #2  
Old 08-25-10, 09:42 AM
S
Member
Thread Starter
Join Date: Nov 2004
Location: north dakota
Posts: 170
Upvotes: 0
Received 0 Upvotes on 0 Posts
Update:

Using a couple jumper wires & an old charger, I individually charged
the cells reading 'zero'.

For about 2 minutes the meter read 0.10 volts. (I had my voltmeter
attached to the individual cell).Then, within 15 sec it jumped up to
1.40 volts.??? I assume to cell was completely dead and finally took
a charge. So I did this to the other 'dead' cells. Same thing happened.
I charged them each about 1 hour. Then, I charged the entire pack a
couple hours.
Drilled some holes in my 2X4. It definitely holds a charge longer than
it used to. Although not as long as my new battery pack.
But it's a hassle to disassemble the pack to individually charge the cells.

Anyone have much luck replacing individual cells?

SteveS
 
  #3  
Old 08-25-10, 12:39 PM
G
Member
Join Date: Oct 2002
Location: Hamilton County, Ohio
Posts: 3,927
Upvotes: 0
Received 2 Upvotes on 2 Posts
Awhile back, I was patching up battery packs on about 20 2ways. If time was money, I could have bought new packs and been ahead of the game. With a mix of new and used cells, it can be a real crap shoot.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: