Hi Bryan. I gather you mean it's an NiMh battery, and the Sprints haven't been sold with these for a long time, so it's possible the battery is dud through being left idle for too long without charging.
However, if an NiMh battery isn't used for a long time, it can sometimes be recovered by conditioning again as one does with a new battery. That's done by fully charging, then using it on the bike until cut-out or near empty, then repeating that two to four times.
If you have already done that two or three times without improvement, it's the battery that's failed. In that case it means a new NiMh battery which I understand Cyclepoint can still supply if you ring them, or as you say, a new Li-ion set of charger and battery.
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