Hi Rod
They are a direct drop in replacement for the argms, same physical dimensions. Max charge is 14.7v and all reports I read none were detrimental. I have only had ours a week and so far so good, only time will tell. Weight of each battery is only 13ks so a total of 26kgs against the 100kgs for the old agms, which I might add lasted nearly 7 years. Set them up on your enerdrive charger by the instructions that came with it. I now have an extra box up front. I got $50 back from the recycling depot for the old agms.
Cheers
Merv