6-FM VR Sealed Lead Acid Battery
12V/20HR
Comes out of one of those car battery boosters you keep in the trunk. Me, personally, I know that they need to be charged about every 3 to 4 months or the battery will go bad. Not dead - BAD. I've given these things to friends and family and specifically told them they need to charge them regularly - even if they haven't been used. Got this one back a few days ago and have been playing with it. First thing I did was to remove the battery and put it on a charger. Charge went up to 14.2V rather quickly, then settled down to 13.6V. Took it off the charger and let the battery sit for a few days without any charging or without any loading. Battery voltage stayed around 12.7V, which from what I know about Lead Acid batteries is a pretty good sign.
Completely disassembled the battery booster and hooked things up and checked the charging characteristics of the booster control board. The battery again quickly reached 14.4V and the charge cycle shut down. Thinking maybe the battery is ok, I know, foolish assumption, I connected a 12V 1.4A computer fan to the battery. Voltage began to fall quite quickly. Within 2 minutes it had fallen to 9.29V. But running all the time I've been typing (60+ WPM) the fan has been running and the battery voltage has climbed at present to 10.12v. I don't understand why the battery voltage is climbing again. Am I de-sulfating the plates? What will happen if I continue to run the fan for an hour? I know, "Test". However, all I can test for is voltage, and assume the current being drawn is 1.4A.
The battery is completely disconnected from all electronic circuitry, other than connected to my meter and the fan. At present the voltage briefly is showing 10.14V. Will this battery recover if cycled a few times? Or is it just plain useful as a door stop?
12V/20HR
Comes out of one of those car battery boosters you keep in the trunk. Me, personally, I know that they need to be charged about every 3 to 4 months or the battery will go bad. Not dead - BAD. I've given these things to friends and family and specifically told them they need to charge them regularly - even if they haven't been used. Got this one back a few days ago and have been playing with it. First thing I did was to remove the battery and put it on a charger. Charge went up to 14.2V rather quickly, then settled down to 13.6V. Took it off the charger and let the battery sit for a few days without any charging or without any loading. Battery voltage stayed around 12.7V, which from what I know about Lead Acid batteries is a pretty good sign.
Completely disassembled the battery booster and hooked things up and checked the charging characteristics of the booster control board. The battery again quickly reached 14.4V and the charge cycle shut down. Thinking maybe the battery is ok, I know, foolish assumption, I connected a 12V 1.4A computer fan to the battery. Voltage began to fall quite quickly. Within 2 minutes it had fallen to 9.29V. But running all the time I've been typing (60+ WPM) the fan has been running and the battery voltage has climbed at present to 10.12v. I don't understand why the battery voltage is climbing again. Am I de-sulfating the plates? What will happen if I continue to run the fan for an hour? I know, "Test". However, all I can test for is voltage, and assume the current being drawn is 1.4A.
The battery is completely disconnected from all electronic circuitry, other than connected to my meter and the fan. At present the voltage briefly is showing 10.14V. Will this battery recover if cycled a few times? Or is it just plain useful as a door stop?