Electric Bikes - Battery Replacement

Hi
My wife currently owns a Synergy Electric Mountain bike
that she uses for her commute

http://www.greenspeed.us/lashout_electric_bicycle.htm

The Battery I think is starting to die as it does not hold its charge very long
so I know that soon I will have to replace the battery

The current battery is very heavy and my question is Can I buy a different type of
battery that is lighter that will still power the bike ?

Current Battery 12Amp 24Volt

Thanks in Advance

As far as I know, it is absolutely possible to replace the type of battery you are using. I'm guessing your current battery is sealed lead acid (like a car battery). I've recently purchased my first electric, but got it used, and I think the batteries (sealed lead acid) will die soon, so I'm looking for something lighter myself. All you need to do is match your current voltage to the motor and controller, and get a connector to match the input to your current system.

Hi
Yeah doing some more research the

Current batteries are 2 in series (This is what it says on the side on the battery)
Enduring
Valve regulated lead acid battery
CBE 12-12 (12V12AH/20HR)
Constant Voltage charge

I have looked around and found some CB12-12 Batteries that I could just replace the existing
rather than find something lighter , But I am not sure if these would work , Do you know
if the CB12-12 would replace the CBE12-12

Thanks

sorry - no experience with those.

Here are the limitations you need to work within:
volts: keep it the the same. (rated voltage between 22 & 27 should be fine.) It may be possible to change the voltage but that could make things overly complicated.

Amp HOURS: for a given voltage, this will determine your range. if your batteries were fine in terms of range when they were new, then you want the same number of amp hours (abbreviated Ah).

Deep cycle or not: if you buy lead acid batteries, they should be "deep cycle" batteries, meaning anything that is NOT a starter-motor battery or a "marine" battery. Starter batteries are no good, because if you use them on an e-bike they won't last.

maximum amps: assuming you like to use full throttle sometimes, you should choose batteries that have a maximum number of amps that is at least as high as the max. amps on your controller. For lead acid batteries 10Ah and up, this shouldn't be a worry. For other types, if it has a "C" rating such as 1.0 or 2.0 or 5.0, then you multiply the number of amp HOURS by the "C" rating to get the "amps" rating.

You can use any battery chemistry that fits these parameters. If you want to know about the different chemistries (of which lead acid is the least expensive and heaviest) you can check out http://www.ebikes.ca/batteries.shtml

Hi
So something like this should work ( I just saw this link on another thread)
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2540
Thanks