How much the battery can take in a charge has to do with the plate design. I-eloop stores energy to the capacitor, not the battery.The point of the AGM isn't that it's a different chemistry -- it's that it can accept charge at a MUCH higher rate without damage, and it can also discharge far deeper and not be destroyed.
The charging system on most vehicles won’t come anywhere near to taxing what the battery can accept. In my truck I run a 200 amp alternator and FLA batteries have so far given the best service life running about two and one half to three years. AGM two years. In the application with the red top in another vehicle with a standard 60ish amp charger it experienced some extra life, however, that 150% extra life vs FLA did not meet its extra cost of being about 250% the price of the FLA.
Where I am in t Mojave desert Underwood temperatures can easily hit 150 degrees in the summer then in four months time be subjected to freezing temperatures. Somewhere like Hawai’i where it’s a much more stable temperature would probably see a longer life span for either case. Enough to offset the cost of the AGMI don’t know.
AGM is good in applications where the sealed design is needed. The non-venting design is critical for use indoors (e.g. UPS or stored solar power) to avoid hydrogen gassing that occurs with FLAs. Hindenburg anyone?
And again, to circle back around, the battery used my Mazda for the I-Eloop is an FLA. you are welcome to use an AGM, it won’t hurt anything, but unless it delivers 250% (or whatever your actual cost difference works out to) the lifespan of the FLA there’s no point in this application. Ots like driving a hybrid. If you don’t own the vehicle long enough to recoup the extra expense of the hybrid option in terms of long term fuel savings, it’s all a waste of money.
Yuasa have a battery recommended for these cars and are reasonably priced, part number YBX7005 (Q55/Q85) 12V 65Ah 620A Yuasa EFB Start Stop BatteryI searched the forums but now I am just looking for a consensus -- if I can get away without going to Mazda and spending $500+, can someone suggest a battery that will meet my needs? Is I Eloop all that important?