Hi. I have an option of choosing between a 36V 10AH Lithium ion (polymer) battery and a 36V 8AH LiFePo4 battery for an electric bike. Cost difference is negligible. Range is important to me. Can anyone tell me what difference in range I can expect between 8AH and 10AH batteries? I am using a 200W motor. Would welcome your thoughts on the subject - I am aware of the inherent safety and reliability advantages of LiFeP04.
Location: Base of the Rocky Mountains, Canada. Wonderous things!
Bikes: 2010 Cannondale Hooligan 3
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Your LiFePO4 option will contain 288 watt hours of energy, whereas the polymer option will contain 360 watt hours which is considerably more energy, and will get you 25% further than the LiFePO4 option (mathematically). Polymer batteries from good manufacturers are safe and trustworthy if used properly and not mistreated.
Thanks everyone for your help so far. I didn't realise the difference between 8AH and 10AH would be as much as 25% - that is certainly worth thinking about. Also the cost angle is important - the LiFeP04 is rated for 1000 recharge cycles and the Lithium Polymer at 500 recharge cycles.
I've been told to think of the voltage as the average speed you'd be cruising at, and the AH as the capacity of the battery. So.. with 12v-80ah maybe you won't go faster than 10mph but you'll go for like all day.