02-10-2018, 09:17 PM
(This post was last modified: 02-10-2018, 10:03 PM by Bob Culver.)
Sounds a bit ominous for the battery. Has it in fact been fully charged originally and occassionally? An 80 ah battery takes two days while at 2 amps.
The intelligent chargers intended for Low Maintenace batteries cut to a very low rate before fully charged. Intended to be left on for a protracted period. Does battery show any volts?
Old dead flat batteries often take a while to accept current even from a conventioanl charger, despite charge volts being present.
If the battery is very flat you could feed a 12v charger thru a length of old heater element wire, an (old) 6v headlamp bulb etc to get things started but need care not to overload the bulb or charger, esp a borrowed one!
The medieval chargers with large plate rectifiers are relaltivey immune to errors.
Incidentally, charging good batteries all the way at very low rates is/was reckoned harmful. About 4% of ah capacity was considered minimum.
The intelligent chargers intended for Low Maintenace batteries cut to a very low rate before fully charged. Intended to be left on for a protracted period. Does battery show any volts?
Old dead flat batteries often take a while to accept current even from a conventioanl charger, despite charge volts being present.
If the battery is very flat you could feed a 12v charger thru a length of old heater element wire, an (old) 6v headlamp bulb etc to get things started but need care not to overload the bulb or charger, esp a borrowed one!
The medieval chargers with large plate rectifiers are relaltivey immune to errors.
Incidentally, charging good batteries all the way at very low rates is/was reckoned harmful. About 4% of ah capacity was considered minimum.