??? Set Points For Different Battery Types

Sam Spade wrote:

pnichols wrote:

Where do you think it's water vapor goes when you have too-high voltages (for the air temperature around it) applied to it too long?


Sorry but that falls into my definition of doing something really stupid.

But then your example goes to show that all batteries are not created equal.

I maintain that charging equipment designed and intended for wet cell conventional batteries, if working correctly, will be JUST FINE FOR AGMs too and water loss should not be a concern as the charging voltages will be lower than optimal not higher.

Sam ... "stupid" is relative to many things.

LifeLine told me that 13.6 volts float left on their AGM batteries for months at a time (like myself and others do when their rigs are in storage at their home) would slowly dry them out over time and hence shorten their life.

I "assume" that 13.6 volts float left on my AGM non-LifeLine batteries with a specified float voltage of 13.6 volts will NOT slowly dry them out and hence shorten their life ... due probably to a slightly different electro-chemical internal design that gives rise to their higher specified float voltage.

Also keep in mind that a float voltage becomes a bulk or boost voltage at high enough ambient temperatures around a LA battery ... per the charging voltage versus temperature charts for both liquid and dry (AGM) LA batteries. At high ambient temperatures that last the summer, one runs the risk of a constantly applied float voltage acting like a constantly applied bulk or boost voltage .... which of course is not a good thing.

I turn off the 13.6 floating volts on our RV's AGM batteries during long runs of hot weather to make sure they're getting the best long-life treatment.