Battery only holding third the charge

[fgcity]

Hi everyone,

My 48v 10Ah battery on the bike seems to have lost 2/3 of its charge.

I charge the battery fully and only after 3A of use it seems to just go low. Also the distance is only 1/3 of what it used to be. The voltage seems to be as before at 58v when charged.

Is the battery simply old now? I do have the kit for 3 years.