I double checked the data sheet and it says,
"The battery is constructed by plates,
separators, safety valves and container.
Since the electrolyte is held by a glass-
mat separator and plates, the battery
can be used in any direction and position
As far as performance goes, my acceleration is a little slower now than it was, but not by much. It's probably mostly due to the extra weight I'm carrying. I went from 64 volts to 72 volts. I had to change from a 15 tooth sprocket all the way down to an 11 tooth, but I may go back up to 12. The bike is much heavier now, but still handles well (gotta love these little Ninjas). The fun factor is about the same.
I like the simplicity of having a simple volt meter on the dash to act as a fuel gage. I went for a 16.3 mile ride today. Top speed only drops from 48 mph to 45 mph after 16 miles. With the Headways, top speed didn't drop until a cell failed!
For me, the simplicity and peace of mind is worth having the extra weight and shorter range. As long as you get the range you need, I wouldn't switch batteries yet, unless you want the challenge of keeping them working. I figure if I can get three years out of the AGM's, maybe I can put an Eestor power cell in and get some REAL performance!
I like pushing the envelope, but after spending $1900 on batteries, building a pack, having a few cells fail, replacing them, then having more cells fail, replacing them with A123's and having more cells fail, I was done pushing. I'll stick to using my A123's in my model airplanes.
After my experience with the Headways, I was giving up on the idea of doing a car, but the simplicity of the AGM's has me thinking about it again.
At your suggestion, I lowered the regen, but It would only let me go as low as 50%.
I wonder if we are using the same chargers. I got mine off ebay. Like you, I have three of them, each charging two batteries. If I remember correctly, they put out 6 amps. I have mine mounted in the tank (I cut the bottom out). The tank gets warm as it charges.
Thanks again for the help.