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New Oh! Sheeeeeeeeesh
Worked on a couple of clients' home computers this evening, finally got the things recovered from worms, virus, killer DVDs, and general Windows problems.

8:30 I called one anxious client and told him I could bring his computer over now - load the car, get in and turn the ignition. Dead silence. Somehow, coming back from the last network crisis I'd accidently turned the lights on and didn't notice in bright daylight.

Well, steep driveway, but very short and entering lots of traffic. Rolled back and poped the clutch. No start. Don't know if the battery was that dead, or I'd forgotten to turn the ignition on (I've done that before).

OK, now I'm stuck across the sidewalk. Driveway too steep to push up, crown of road too steep to push out through heavy Friday evening traffic.

Within extension cord distance, but Battery charger died last year and I've been so busy I hadn't gotten around to getting another. Maybe OSH has chargers - nope, after 9:00, they're closed.

What to do, what to do?

Well, looking through my junk pile I found some dead UPS units. Hauled 'em all inside. Found an old Tripp Lite that still produced 13 volts at the battery terminals. It didn't seem to like the car battery though, and didn't seem to stay stable. Put in a resistor to limit current, but the voltage was still weird.

Weird voltage turned out to be false indications from Fluke multimeter. Its battery was on the very verge of death. With new 9v battery, everything was OK (this is what you call a "bad battery day").

Pulled the resistor at 10.6 volts. At 12.65 volts we have ignition!

Sometimes it's a good thing not to throw stuff away just because it doesn't work any more. Perhaps not often, but sometimes.
[link|http://www.aaxnet.com|AAx]
New Happened to me
but I was at home and had the battery charger with me. My son was in the car and was flipping on and off the lights. I thought I covered all the lights, except I missed one, the one on the roof of the car in the middle. My wife's Uncle is staying with us and he wanted to go somewhere, so when I went to start the car it wouldn't turn over. I used the battery charger, which said the battery had a 25% charge on it, but still wouldn't turn over. So we put it on for a while and then started it up.

I'm a packrat so I don't throw things away anyway. I got a lot of old computer parts.

I am free now, to choose my own destiny.
New Day of the Triffid-electrons
Heh.. I'd have expected nothing less of ya, Andy.. via the 0th Commandment:

12ish volts from Anywhere will do, if'n ya gots the time for it to trickle in...

(Actually anything up to 15ish source is fine. Above that on modern cars, -to save electronics- an internal regulator might dump to ground anything over about 15 V)

In fact, with Both sides of battery disconnected (!) you can use any old diode (5 amps is nice) capable of ~200V + suitable resistor for half-wave mod of Ohm's law - and your 120V. line!! in a real pinch. 2-3 amp diodes rated >1000V are tiny and real cheap. 5A may want a small jeat-sink.

I have heard... of people with mondo D-cells squirreled away, dumping a bunch into the 12 volt sump. A fresh Alkaline might get ~ 7? Amp-hours, say about half transferred in a reasonable time. 10 gets ya 15V. nom and you add new ones as these drop in voltage (where $ is beside the point).



Always feels good the beat the *System!



Ashton
* System: I have made an error and now the Gawds must punish me. :-(
Screw the Gawds: none is more powerful than Saint Ohm. :-)


PS - a lot of modrin cars do a lousy job of ever fully-recharging a battery, esp. in city, A/C, lights usage etc. The 15V clamp renders useless the High-sounding "current" rating of those now tiny alternators. You don't *get* real Ohm's law there.

I notice this on my (now modrin) car - via a quick Spec. Gravity test + noting actual nom. voltage value = under a small load to cancel out the fake-charge 'float' level.

Solution: a decent (sophisticated taper) charger. I think.. that periodic recharge to 'full' has the effect of delaying formation of those too-big crystals we call 'sulfation'. Anyway I try to toss the charger on every 7-10 days. My last battery went 104 months. Same battery in a friend's car, non-pampered, went ~ 70 months. 2 samples not very good stats.

Nice save!
     Oh! Sheeeeeeeeesh - (Andrew Grygus) - (2)
         Happened to me - (orion)
         Day of the Triffid-electrons - (Ashton)

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