Join Date: Jul 2009
Location: Fairfield, CT, USA
Have a Shorai on the 999s and a Yuasa AMG standard on the ST, been in place for five years on the 999s. Yes, the Shorai is a hard starter in the cold, especially as I wasn't informed about the starting procedure below 40 degrees. Now it's not a problem and has never failed since I got correct instruction. I've always had the proprietary charger on it, however, and am on the second charger. My experience is that the Shorai is still a bit tricky and in need of attention. The Yuasa works every time. In a long trip, right now I still want the AMG on the bike. Maybe my lack of imagination, so be it.
The Shorai is excellent for high comp engines, and is very good for all kinds of other situations. But the ST is hefty, and I'm not so concerned about weight on it as I am on the 999s.
I have heard about Shorai issues, most of which - so far as I understand them - boil down to two situations: First, not using an appropriate charger. Second, not ensuring that the battery is isolated from parasitic draw without the charger.
Shorai — nothing but excellent service from them. I call them, they answer the phone. We chat. They identify the problem and remedy it. I have yet to talk to anyone with a different experience. When the first charger went belly up, they identified the problem, never asked for a receipt (which I was ready to produce) only the date of sale, and then sent me a replacement with excellent instructions on how to send the original back to them so I wouldn't be issued a core charge. All around, well done. No complaints.
Perhaps the only complaint I would have is - as I already said - that they did not inform me at the beginning the cold-starting procedure. I had to learn it from the shop owner I used to go to. Once that was in hand, everything afterwards was walk in the park. At this point, I can't imagine anyone purchasing a Shorai would be so ignorant as not to learn of this before the point of sale, but five years ago it wasn't so clear.
2005 999s Hephaistos polumetis
2003 ST4s ABS Senna Petrarca peregrinus ubique