Prodeco Phantom X spare battery

[LTZ470]

Phantom X:
http://yearoftheebike.blogspot.com/2011/05/phantom-x-by-prodeco-tech-photos.html

Can I fit this battery onto the Phantom X? Any other suggestions for a battery for the Phantom X?
36V 15Ah LITHIUM LiFEPO4
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140661767274&ssPageName=ADME:X:RTQ:US:1123

 

[LTZ470]

Could these be utilized?
http://www.goldenmotor.com/batterypack.htm

 

[LTZ470]

Thanks Lester!...

 

[miro13car]

LTZ
why would you need battery for Prodeco, how old is it?

 

[LTZ470]

It sticks out behind the bike too far...just looking at options of changing it to something shorter and lighter if possible...