Hilti rotary hammer drill - seeking dead BP40 battery


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Trad climber
Topic Author's Original Post - Nov 13, 2017 - 06:06pm PT
I've come across a Hilti TE-5A rotary hammer drill (sans battery) at an attractive price. I'd like to equip it with a cable connection and an external battery pack.

One easy way to do this would be to start with a dead Hilti battery that fits. I believe the correct battery designation is BP40.

Anyone know where I might find one?

Grizzlyville, WY
Nov 13, 2017 - 06:48pm PT
I have a few 36v NiCd batteries from a TE6 I'd part with. Not sure if compatible.

Grey Matter
Nov 13, 2017 - 08:54pm PT
see Juan Maderita's info about making an Li battery for a bosch,
only use 3 packs for 36v.
NiCad is toxic crap.

Trad climber
Topic Author's Reply - Nov 14, 2017 - 05:34am PT
The TE-5A is 24v. This link Pimp my Hilti does a good job of showing how to wire up external Li-Po batteries (in this case, two batteries of three cells each, yielding a nominal 22.2v).

I'm hoping to find a dead battery pack that fits, remove the dead cells and use only the housing with its electrical contacts. Googling suggests that the TE-6 uses a different battery geometry that probably isn't compatible.
Jerry Dodrill

Nov 15, 2017 - 08:08am PT
This is pretty much the same setup I've been using for over a decade after a friend wired it up for me. The TE5A has been a real workhorse. Be sure to reinforce the cord where it comes out of the battery pack. We put a washer on the cord and tied a knot so it can't get yanked out, but when you constantly put the drill in/out of backpacks it gets pretty worn. Good luck finding your battery pack.
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