Shorai LFX18A1-BS12 Extreme Rate Lithium Iron Powersports Battery

• Ultra-light, one fifth the weight of lead-acid batteries on average
• Safe, no explosive gases during charge
• Faster cranking for better starts
• Just discharge and dispose
• Super-fast recharge rate

After several successful rides over 3 weeks, battery suddenly showed 10V with minimal load (vice 14V for every earlier use) prior to starting. No decline, just sudden 4V low load drop between one use and the next. Attempted trouble shooting per Shorais web site and email response from Shorai with no success. Specified trouble shooting included attempting to charge off bike with an older style car battery charger. Now prepping for a warranty return to Shorai after I get a return label from them. At this time I cannot recommend this battery for routine street bike use.

edit 10/25/12

Shorai got back to us yesterday. A new battery is on its way via FedEx. They still don't have a final reason for the failure but they have been courteous and responsive by email. At this time I've moved my rating up to 3 stars (from 1) based on their help by email and shipping a new battery.

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Battery was only slightly smaller than the stock unit but weighs almost nothing in comparison. And it starts my RC51 right up, the old lead acid battery was having a hell of a time turning over the high compression V-twin. The included foam padding was easy to apply in order to keep the smaller battery snug in my battery box. I applied to the battery instead of the case in order to make it easier to remove if I ever go back to a standard lead acid battery... doubt I ever will.

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Smaller, lighter and more cranking power!! Wish I had done this upgrade years ago when I first heard about Lithium Ion batteries.

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Was disappointed with the Everstart battery, from Wal Mart, crapping out after 2 years. Saw the ad for these Shorai batteries in a motorcycle magazine. Purchased the better of the two that were recommended for my Suzuki Boulevard. Well, I have had it for 3 days now. Asked my wife if she wanted to take a late autumn ride out to breakfast. The bike started right up. The temp was just above freezing. So far, so good. Guess I'll have to take their word on how it'll outlast my Wal Mart battery. Might have to get one for my 4 wheeler and my tractor. They often sit idle longer than the Suzuki does. These batteries say they endure that abuse better.

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A quarter of the weight of a OEM Yamaha V-Max battery at twice the price. Loads of cranking power. We'll have to wait to value the battery's longevity to receive 5 stars.