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Just talked to Keegan and he told me the warranty is 2 yrs. Also noted on the specs the internal resistance is <.0006 ohms. So a 400 amp draw would make the voltage drop per battery .24 or less & for a 45 piece pack at 144V you would have a drop of 10.8V max, leaving 133V minimum to move the vehicle!
Don't forget that internal resistance is a moving target dependent on factors such as temperature and state of charge. 50% state of charge during the winter won't do as well as a battery fresh off its charge on a hot summer day. It's hard to work off of manufacturer provided internal resistance numbers because we don't know all the factors. ...but based on those who use them, I don't think you'd be disappointed. Especially comparing these to flooded lead-acid, there is no comparison, IMO.
 
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