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Best Lightweight Battery?

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I ran the EarthX ETX12A Battery in my 05 CRF450X with the stock charging system. I use mine on road with everything LED and the stock charging system was not enough to keep the lithium battery happy. It would die after about 30-40mins of riding and not start the bike. Lithium batteries need a specific input voltage to charge [12-15 volts i think] which is higher in the rev range on the CRF. My stock CRF would charge at 8.3 volts at idle and wouldn't charge past 12 volts unless i was around 5k rpm or above. If you aren't running many accessories you should be fine if your really only using it for cranking. BTW i almost thought the box was empty because of how light the battery is. 

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