StandUp Scooter with CVP transmission

[Astropower]

Hello Dave,

1 Headway cell of 3.3V 15Ah, cost 20USD, it 2.475W per 1$
the Lipo that you show me it the most cheapest on HobbyKing, other Li-Poly battery cost 20-30% Higher,

but it i compare the deal that you show me, it 14.8V 5Ah, and cost 22.6USD, that is 3.27W per 1$.

so you need to pay 1.3 times more for LifePO4 compare to Li-Poly,
and get 4 times more lifetime and more safety technology.

and if we compare to average Li-poly battery cost, we can find 10-15% price different only.

now i happy with my AGM battery, i have 1 year so save money for Li-Poly or LifePO4, until the AGM will die.

[Dave-s]

Hi Astro,
First, the LiPo from HK costs 21.38$ (I am a platinum member ) so it is 3.46 Wh/$.
Why buy other LiPo, when you have this one?
Although according to numbers on the web LiFe can have over 1000 cycles, and Lipo 300-500, I am sure that this new generation of LiPo gets over 500 cycles.
LiFe and LiPo are much much better than AGM, because of the way they discharge.
AGM voltage starts to drop almost immediately, but LiPo keeps voltage of 3.7v and LiFe 3.2v for the entire discharge and then the voltage drops almost immediately.
This means in SLA the spped gets slower all the time, but for lithium you get constant speed until the end.
I had SLA on my scooter, then moved to LiPo. The difference is amazing. I will never go back to SLA.

[agniusm]

Hi Astropower, that is a shame about the battery. You didn't had BMS right? Have you considered A123 cells? I have those on my scooter and so far they are good. Using it with cellman's BMS. I have developed termination kit for A123 prismatic cells. I don't know if they would fit in your frame thou. 16S kit i make is 118x160x236 including battery. It would weigh 8kg, you would have 20AH. I would say that they are safer battery, check out my thread on abusing these cells:
http://endless-sphere.com/forums/viewtopic.php?f=14&t=38545