Electronics > Repair
Hercules 20v Battery - Pinout?
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AmmoJammo:
I'm trying to power a Hercules impact driver from a different battery.
I do not have access to a Hercules battery.

The tool has 4 contacts, two for power, and another two unknown terminals.

Without the two other terminals connected, the tool refuses to run.

Does anyone know what these terminals are for? Or have a battery they can try to identify their function from?

Thanks!
Phil1977:
In case no one has a functioning model of this battery:

Quite often (e.g. at Makita & Dremel) the battery has a "Power good"-output telling the motor driver that everything's okay. If you connect the power-contacts to your lab supply, you could try to connecting e.g. a 1kOhm-resistor between (+) and the two unknown terminals. From my gut feeling chances are low you destroy something but chances are there that you activate the motor.
soldar:
I think it may be a temperature sensor, just a temperature dependent resistor. I would try putting a resistor. First between the two free terminals and if that doesn't work then between each terminal and the negative of the battery.

Think one would have a temperature dependent resistor to negative and the other might be for data  or battery capacity identification. 
fzabkar:
I would at least start by measuring the voltage at those two pins after connecting just the battery terminals. If one terminal is sitting at 5V, say, then that could be the top end of a regulated potential divider. This would be consistent with a temperature sensor. The bottom end would be grounded, either directly or through a resistor.
AmmoJammo:
One pin goes to 5v when the trigger is pulled, and stays there once its released for about 2 seconds.

There also looks to be a 1.5ms 0v pulse while this pin is held high.

The other pin doesn't seem to measure anything.
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