[s-cars] Lead/Acid battery recommendations

[Larry]

From what I read, AGM batteries will suffer reduced life from the heat of overcharging (particularly if you do extended travel) if your voltage regulator is set to the typical flooded cell 14.4V. Basically the same charging voltage required for a battery tender apply to the cars charging system.  The recommendation said stick to the OEM type battery (they specifically mentioned some BMW's, Porsche's and NA and NB Miata's were designed for AGM batteries).  It also said engine compartment heat will shorten the life of AGM batteries, which is why NC Miata's (no idea on the new ND) are designed for flooded cell batteries.

LL

Sent from my pocket electronic thingy

> On Nov 14, 2016, at 12:07 AM, Taka Mizutani <t44tqtro at gmail.com> wrote:
> 
> What I'd like to know is why an AGM battery is or is not a suitable replacement for a flooded cell lead/acid battery.
> 
> I know the charging requirements on a tender are different, but I don't know of any differences in the alternators used in cars that have AGM vs. lead acid flooded cell batteries.
> 
> Since there are only two big manufacturers of batteries in the US, I would just get what is not too expensive with a decent replacement warranty. It's going to be Johnson or Exide.