Home |
Search |
Today's Posts |
#30
|
|||
|
|||
Battery Meter
"Gould 0738" wrote in message ... has "been brought up" to 13.2 Volts, it only means that the charger can sustain that Voltage. Immediately after removing the charger, the Voltage will still be artificially high. "Fully charged" is not "artificially high." Do you dispute that the voltage of a battery cell is 2.2 volts? Yes or no answer please. Sure, I'll dispute it. While the voltage of an ideal cell might be higher, the "open circuit voltage" of a modern marine battery such as a Rolls (like you have) or a Trojan (like I have) will be somewhat lower, perhaps 2.13 volts or a tad less. If you have any doubt, you can look at the Rolls site or the Trojan site. http://www.rollsbattery.com/Bulletins/600.htm http://www.trojanbattery.com/custome...erymaint4.html Of course, to properly measure this, you have to wait a little while (at least 10 minutes, better after an hour or more) for the battery to stabilize internally. Now you can probably find 1000 sites oriented towards high school chemistry and physics labs that say 2.2 volts, but I claim they are all trumped by the people that build and maintain actual marine batteries, which are, after all, a slightly different formulation than the traditional lead acid battery. Do you dispute that 6 x 2.2 = 13.2? Yes or no answer please. Duh. Garbage In Garbage Out. You're really trying hard to be a horse's ass here, aren't you? After the battery self discharges a bit, it will stabilize about 12.6 or so. It isn't self discharge. If you read the quote from Calder you would understand that. The battery charger can induce a "surface charge" that is not representative of the actual state of charge. But it has self discharged to get to that level, and while it may be "adequately" charged or even "typically" charged, a battery cell is not fully charged until it gets to 2.2 volts. Actually, that's not the issue at all. The issue is that the cell can read 2.2 volts and NOT be fully charged. Any battery that has been charging for a while, regardless of what state of charge it has reached, might read 13.2 volts immediately after removing the charger. That's why its meaningless. Are you claiming that if you can ever read 13.2 volts from a battery it must be fully charged? Yes or no answer please. Nigel Calder not whithstanding. Yes, we know that the opinion of experts and all of the other observers is not good for your argument. It's basic physics. No. Its marine batteries. Sometimes real life is a bit different from what you read in a high school textbook. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Is it my battery or alternator that let me down? | General | |||
why 2 batteries on boat? | General | |||
Remote battery for Lectrasan ? | General | |||
charging deep cycle trolling battery with truck | General | |||
More Battery Questions | General |