Question - What were your recharging habits? Did you recharge it often? Or, did you recharge it only when it was almost totally discharged?
I’ve always heard that rechargable batteries will slowly imprint to the voltage change they go through, effectively narrowing the voltage swing they are capable of. The net effect is that over time the total amp-hours they can hold is continually decreased. This may depend on the type of rechargable battery. Does anyone know what type is in the Fuze? I have always used Energizer NIMH rechargable batteries in other devices and they do behave this way.
I let mine discharge to, or close to, zero each time I use it. When I’m through listening to it I just put it down without turning it off. At night I plug the fuze into my stereo system in the bedroom and let it go all night long. I turn off the stereo system (not the Fuze) when ready for sleep.