I just picked up a Battery Tender Lithium battery. I've only had it for a month. I've swapped it back and forth from my stunt bike to my 05 ZX10. So far it has performed great its rated at 240 cca. And weighs only 1.7lbs light and powerfull. On Saturday I put it to the test on my stunt bike. Had a very wet, cold, and windy lot session. So I had my grip heaters set to high keeping my hands nice and toasty. And even on the occasion both my fans kicked on it kept up. The bike remained very responsive even at low idle.