Bob_Spidell
Yoda
Offline
AGM batteries have two advantages: They don't self-discharge as quickly as wet cells, and they don't spill if you roll your Healey. If you roll your Healey, battery acid spills are the least of your worries. I use Costco batteries and they are just fine.
If wet cell batteries get overcharged somehow they can (will) make a mess in your boot. My car has been on a BatteryMinder for a few months while the engine got rebuilt, and now there's evidence of overcharging--the crunchy, white residue on the holddown bracket--on my battery and one of the cells was low. First time I've had this happen with a BM; don't know if it's the battery or I left the charger on too long (supposedly, this shouldn't be a problem with a 'float charger').