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charger beta
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Aug 30, 2004, 3:29 PM
Post #1 of 2 (751 views)

Registered: May 29, 2001
Posts: 31

charger beta
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Hi folks,

Iím trying to supercharge a Hilti TE-10a and I have some questions about charging the battery pack. Iíve got three 12-volt, 7.6-amp-hour hobby batteries. The charging specs say:

Voltage regulation Initial Current
Standby 13.5 Ė 13.8 volts n/a
Cycle use 14-15 volts 2.16 a max

I donít want to buy a 36-volt charger because itís going to cost more than a 12-volt charger.

So what Iím going to do is run wires from all the batteries into a 6-pronged female harness. Then Iíll build two adapters to attach to that: one will be a male harness that will link it series wise into a 36-volt battery, and output it into a 2-pronged household plug (Iíve retroed the drill with a 2-pronged household plug so itíll work with my buddyís battery packs).

The other harness will link the batteries parallel wise into a big 12-volt for use with a charger.

So. Now that Iíve linked my three batteries in parallel, what do I charge them with?? How many amps out do I need in order to avoid frying the batteries? The guy at the battery shop said a 6 amp charger would fry the batteries if I used it to charge the batteries individually, but since Iím doing them in a series is it okay? I just want it to be cheap, but I donít care if it goes slow. I just donít want to wreck my batteries, and I want to ensure that I can use a 12-volt charger to charge them in parallel instead of individuallyÖ Ack. Iím confused.

Any help is very much appreciated!



Aug 30, 2004, 4:01 PM
Post #2 of 2 (751 views)

Registered: Aug 27, 2002
Posts: 514

Re: charger beta [In reply to]
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get a hand drill

or three chargers with floating capacity

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