The newest generation batteries are superb, whether from Sanyo or two of the Chinese manufacturers. I can't give more details of who the latter two are at present for reasons of commercial confidence, but will hint that one of them was one of the worst formerly.
It's early days to speak of length of life, though the Sanyo ones already have a good long term record and one of the Chinese prototypes has been working hard for a long time now.
Current delivery on one of them tested is well above previous capabilities, voltage drop under high load never intruding, no matter how brutal the treatment. I'll be buying eZee's latest Sanyo 10 Ah one for my two bikes later this year, but hope to get hold of a 13 Ah one from one of those Chinese makes some time later if eZee ever buy them for their bikes.
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