Electric Bikes - Stoked! Ampedbikes making an inframe battery
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09-29-08, 12:54 PM
I found this on the ampedbikes forum. They are going to make an injection molded in frame battery pack for around $450.
They are deciding between Lifepo4 and Phylion Lithium cobaly magnese..
Anyone know about these phylion batteries?
heres the thread
09-29-08, 04:32 PM
I can tell you the differences...
The phylion can provide a much higher rate of discharge if the motor requests it so you won't experience cutting out even up very steep hills.
It can be recharged faster than lifepo4.
It may weigh slightly less, like 1-1.5 pounds less than a lifepo4 pack that is 10ah.
The biggest drawback is that it has a relatively shorter life cycle... it can only handle 500-700 cycles (depending how deep it gets discharged), it costs about the same as lifepo4 which can do 1000-1500 cycles (again depending how deeply it gets charged).
There's some other differences too but I think those are the main ones! Hope that helps.
There are different "grades" of LiFePO4 batteries.
With the A123/DeWalt lifepo4's you don't get very good range for your dollar, but the cells can be charged and discharged extremely quickly. (you get a lot of watts out of the batteries for your dollar, and a lot of watts per pound of weight.)
With most of the e-bay lifepo4's, you get a lot of range (a lot of watt hours) for the same amount of money, but the batteries should be used at a rate that makes them last an hour or two. As long as you buy a big battery (which will be relatively affordable) you can get a lot of power (watts) and still have your battery last for a couple hours of riding.
The question is, is this phylion technology enough of an improvement to be more cost effective than both of those types of Lifepo4's, in terms of meeting people's need for
-enough power (watts)
-enough range (watt hours)
-enough charge cycles (long lasting?)
-enough watts, and watt hours, for the weight (power density, energy density)
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