Best battery option for an assist bicycle

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tilt2468
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Last seen: 7 years 8 months ago
Joined: Wednesday, May 27, 2009 - 06:57
Points: 76
Best battery option for an assist bicycle

I need to get some new batteries to replace a 24v 10ah sla pack. The sla's have
worked well in terms of performance, but the lifespan has been about 80 cycles
resulting in a per ride cost of a little over one dollar per ride.

I have a pair of Schwinn Protanium Lithium batteries that appear to be
technically beyond my abilities to use confidently-- I don't want to sweat an
explosion because I am not pedaling fast enough or burn anything down while
charging.

I can go with another set of sla and keep it simple. I chose the sla for my
first pack because I was just starting out and thought I might not like the
commute, but now I am ready to do this for several years so it might be worth
investing in something better:

I am wondering about the Ping batteries at
http://www.pingbattery.com/servlet/the-6/24V-20AH-V2.5-LiFePO4/Detail

Price is higher initially, but not over the life of the battery.
Temperature range is much more realistic for my climate than Lithium.
Charge time is not mentioned.
Safety sounds like less of a concern than Lithium.
I could get more power with less weight. Is it best for battery life and
reserve capacity to get a larger capacity to avoid deep discharge?
Unlike sla's which will fit in the bicycle's factory battery case, I will have to carry these in a
bag due to their width.

I looked at Ping on e-bay last summer and it appears that Ping is making more of
an effort to provide a uniform product than before.

Is it realistic that a 24v 20ah Ping battery would last three or more years? (due to weather and other factors, I only commute about 40% of the time, so I won't hit 1000 cycles) Something better may come along in the meantime, but I don't care because the 24v 10ah is plenty for my commute even into a strong headwind-- fresh 24v 12ah sla are enough)

Are there any other good chemistry options or suppliers to explore?

Thank you to those who have assisted me in this battery quest!

KAE
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Last seen: 12 years 1 month ago
Joined: Wednesday, May 27, 2009 - 13:17
Points: 23
Re: Best battery option for an assist bicycle

I have just opened an online store that sells LiFePO4 Batteries. These are high discharge rate lifepo4 cells that will provide a lot more power than a ping pack. They are reasonably priced as well, a 24V 10Ah pack with BMS will be about $250 - $300 depending on whether you assemble it yourself or not. Free shipping is included! Feel free to check out the website at http://www.kennedyalternativeenergy.com

Charge time on these with the 7 amp charger is about an hour and thirty minutes for a totally dry cell. Cycle life is over 2000 cycles, and a shelf life of 3 - 5 years or more is very reasonable. They are smaller cylindrical cells that can be configured to fit your enclosure easily as each is only 38mm in diameter by 145mm long. Up to 100 amps rated maximum discharge, 50 amps continuous!

-Joseph Kennedy

Kennedy Alternative Energy
http://www.kennedyalternativeenergy.com

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