I've just ordered a pair of UB 40 8D agm's to replace a pair of PowerTech 8D agm
housebank which were purchased in spring 08. My management of them hasn't been special using a link 20 to keep an eye on the system, which included a 120 amp alternator
with a Balmar
MaxCharge 612 (now 614) charger
and a pair of 55 watt solar panels
on a PV14 regulator
. Boat was on mooring
and no shore power
charge except for winter layup
The PowerTechs are not dead but their capacity is very small and so after 8 years they are being replaced.
I don't know a thing about the UB40 8Ds but they were the most reasonable AGMs I could find and I assume most are made in China
and so it's a bit of a crap shoot. I'll report back when I have more to say.