So...lets say you happen to get you hands on a beautiful old-school BOSCH PBM V-1 cordless drill.
But it came with a couple of drawbacks:
A) The Ni-Cd battery pack is useless (makes sense after all those years).
B) It didn't come with a charger.
So you come to the logical conclusion. The cost of a new battery pack is more that you ar willing to pay,
and its impractical to rebuild the pack with new No-Cd cells as you don't have a charger to begin with!
So what do you do???
Convert to Lithium Power of course! :-)
---SEE LAST STEP FOR AN UPGRADE---
All you'll need is the following:
1) 2 x 18650 li-ion UNPROTECTED batteries (branded is better than generic Chinese)
2) One holder for 2 18650 batteries (cheep on eBay or locally) ---SEE LAST STEP FOR AN UPGRADE---
3) A small rotary tool (I used a Dremel with metal cutting discs)
4) Soldering iron (25W should be enough)
5) Hot glue gun (super glue, optional)
6) Tool to open up the old battery pack (I ended up using the Dremel)
Its really simple, so...lets begin!
You need to determine the voltage of the pack you have on your drill.
This should be printed on the pack itself.
My pack was a 7.2Volt one (using six Ni-Cd sub-C cells).
So it makes sense to use two 18650 lithium batteries (at 3.7V nominal voltage each)
So we need to replace the old dead Ni-Cd cells with the new lithium batteries.
First of all we take the old battery pack and pry it open.
Some are easier than others. Some even have screws but others (like mine will require a Dremel)
Try not to do much damage as we will need to put the bottom half back on.
The only thing we will need from in there is the battery pack contacts and a small plastic piece that holds them.
Discard the old cells properly (and be careful of any toxic acid residue on them)