I just finished a Sanyo 2700, AA, 12-cell pack. I charged it up and my DMM shows it at 15.2v (14.4v pack). When I either brush the wires together, or connect to a 12v / 10 watt bulb, I get absolutely nothing. Volts go to zero, no spark of any kind. I put the bulb to the wires while charging and it lights at ~18v, so that's fine and I've tried other fresh bulbs, too. I think I hear a scritch sound from the cell pack sometimes, but it seems to be juiceless. Put it to the DMM, 15.2, the bulb nothing, the DMM 15.2, OK the DMM and the wires and then simultaneously over to the bulb leads...nothing. Help.
HELP - Battery voltage goes to zero w/resistence?
- Thread starter wogamax
- Start date
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TinderBox (UK)
Flashlight Enthusiast
check the connections again, sounds like you have a bad one.
since you made it, is their a protection circuit inside the pack.
regards.
John.
since you made it, is their a protection circuit inside the pack.
regards.
John.
No protection circuit. What I'd like to rule out is that these batteries aren't defective. If these symptoms don't sound like that, I'll feel better. As it is, the batteries didn't seem to heat up at all using an auto charger rated for 300ma. I left them on a 1.25 amp 14.8v charger this morning. I guess a bad connection may dump the current that would otherwise make it to the batts.
I'm a little bummed at how simple this should be, but isn't. All it is is two 6-cell Philmore pre-fab button top battery holders wired in series. I actually bought the ones with 9v connector tops and directly soldered the wires to them. I don't know why, but I had connection problems on a another pack I built. In that case, the volts were zero when unloaded, so it was obvious. For some reason a solder joint right to the metal contact didn't work.
Thanks
I'm a little bummed at how simple this should be, but isn't. All it is is two 6-cell Philmore pre-fab button top battery holders wired in series. I actually bought the ones with 9v connector tops and directly soldered the wires to them. I don't know why, but I had connection problems on a another pack I built. In that case, the volts were zero when unloaded, so it was obvious. For some reason a solder joint right to the metal contact didn't work.
Thanks
TinderBox (UK)
Flashlight Enthusiast
I have a simmilar type batterys box, and the battery fit is not the best.
my money is still on the battery`s not making a good connection.
the batterys might be to fat, try some thinner ones, even alkaline ones just to test.
regards.
John.
my money is still on the battery`s not making a good connection.
the batterys might be to fat, try some thinner ones, even alkaline ones just to test.
regards.
John.
TheIlluminator
Newly Enlightened
- Joined
- Jun 30, 2006
- Messages
- 22
put a load on the batteries and test the voltages one at a time. First one should be 1.2v, second measurement should be 2.4, etc. This should tell you where the bad connection is.
glockboy
Flashlight Enthusiast
Picture?
