New life to old 24v Bosch drill?

Gallery, Projects and General > How do I??

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vtsteam:
Re. batteries charging and fires, please read the link below from a hobby model forum

While it applies to LiPos mainly used in model planes, I have personally had a non R/C NiMh battery pack overheat and melt a plastic case due to a peak charger failing to recognize when the battery was full. Luckily I was attending it at the time. Any rechargeable battery can, burst, or catch fire if the charger doesn't charge appropriately. Mixing and matching chargers and batts is serious business.

http://www.rcgroups.com/forums/showpost.php?p=1936756&postcount=4

vtsteam:
http://www.drill-battery.co.uk/cordless/abatteries.php/6+BOSCH+GBH_24_VRE+127241

And there seem to be a lot of 24V Bosch chargers on EBay, both used and new when I type "bosch-gbh-24-vre" in the search field. It looks like you could find a replacement by matching part numbers to your charger.

awemawson:
This is a place I've been intending to use for a while.

http://www.recellyourbattery.com/prices

I've re-celled De-Walt 18v packs a couple of times - don't buy cheepo cells from ebay go to a proper supplier

steampunkpete:
Many moons ago I inherited a project that required a rechargeable, sealed battery pack for an underwater application. The terminal voltage was of the same order as your drill. What we found was that if the battery packs weren't built from cells from the same batch, and preferably consecutive cells off the production line, then reliability was low - the packs failed after a limited life. The problem stemmed from variation in charging characteristics from cell to cell; thus in a stack of cells taken from more than one batch, some cells would still be charging when other cells were fully charged, so in order to fully charge the pack some cells inevitably ended up over-charged. Your chances of being able to select a set of cells that you know meet the one-batch criteria are small.

I think that the moral is go for replacement genuine parts, and if you can't get them, then bite the bullet and get a new drill. Is it really worth the time and effort to bodge something up with the battery and charger if the drill is also old and may not have a useful residual life?

An NO don't even think of going down the 240 Volts a.c. route. You might have to be mad to post here - but 240 Volt mad is too mad.

Chuck in E. TN:
Couldn't you find a electronis person to build a mains power supply with the required voltage and current capability into a stripped out battery case? Seems if the drill was worth keeping, that's what I'd do.
Where are you located Loply? I have a brother-in-law thats an electronics guy with a shop in Fordam in Cambs. I can hook you up, but be quick, he's retiring soon.
Chuck
Chuck

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