That's a LifeBatt LiFePO4 battery (48V 20Ah, equivalent to 8-9 of the 10Ah/12V
SLA batteries in terms of power output).
It uses the "PSI" LiFePO4 cells, which are one of the best cells available
(those and A123). These cells can handle
up to 10C current, which for this 20Ah battery would mean 200 amps
continuous! The bike uses a max of about 40A, so this gives a nice
cushion, which will make the battery last longer. The PSI cells have
been tested to last for up to 3,000 cycles, so I suspect this battery
will be around for a long time.... (3,000 cycles * 20 miles per cycle =
For all my ebikes up until about 2004 I used lead acids, then for
a short while NiMH. They worked fine...
but now I've been spoiled by LiFePO4. It is a lot lighter, delivers a flatter
power curve with little sag at the end of discharge, and lasts a lot longer...
Of course, it is much more expensive upfront (in the short term - over its life, it
is actually less expensive...). And the technology is new.
You've got a nice setup, thanks for sharing!
--- In email@example.com, Victor Khong <victorkhong@...> wrote:
> What type of battery is that? Sealed lead acid, Nimh, Nicad or something else?
> This is my version of an e.xtracycle which I use to transport myself and my wife.
> I use SLA right now because its simple, cheap and does the job for the range I need.
Build thread is here: http://tinyurl.com/c5g7z8