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I'm trying to test some 18v batteries. Need to know which holes to put leads into and where to set the knob.

Don't tell me to GTS. I'd rather get human advice.

I'm trying to test some 18v batteries. Need to know which holes to put leads into and where to set the knob. Don't tell me to GTS. I'd rather get human advice. [Link Title](https://pic8.co/sh/HK6sUW.jpg)

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[–] • 1 pt

That could be many things from a bad controller board in the battery to a dead cell.

[–] • 2 pts

I'm starting to think the videos might be bunk.

[–] • 2 pts

Sometimes you can bring a dead multi-cell pack back to life like this, but you have to consider that the pack itself may not have any kind of charging controller in it - it may be in the tool itself. You can run quite a risk hooking an essentially unlimited current to what may be a dead short. If there is an onboard controller, it's probably smart enough no to turn on until some handshake is given, so your efforts are futile in this case.

I'd only connect two packs together like that as long as you realize there's a very small but measurable chance that you could wind up with a big hot fire.

[–] • 2 pts

No fires. But it didn't work. Something was definitely going on because the good battery lost voltage and the bad battery seem to gain a little bit of voltage but when I put it on the charger is still instantly flashes bad battery. I tried it with two of my dead batteries and it didn't work with either one of them.