Profpointy
Legendary Member
That's the old shape NiCad battery from years ago, they started phasing out the tools for this shape battery back in 2012. They've shown good commitment in supporting these batteries for so along after they ceased tool production for that range.
As previously stated the newer 18v (uk)/20v (us) lithium ion batteries will be around for the foreseeable future.
It shouldn't be that hard to take apart a battery pack and replace the cells, unless they are a totally defunct type. De walt etc will buy in generic actual cells within.
If changing type of cells it might get tricky
as the charger may not be compatible
and the total voltage will have to be close to the original design.
As an aside in the caving world it was common to build a dummy Bosch battery pack (out of wood) connecting via cable to an ammo can of hefty cells. You had to take care as the drill wasn't built to run continuously as they assumed you'd stop after flattening the battery (or two) rather than running it off something with 10x the capacity. Some folks added a fan to the drill robbed from the mains equivalent. Fans sap power so it made sense not to have them on an intermittent use item
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