B
According to your info posted,
5000+ miles @ 32 miles per charge = 156+ charges minimum?
What is the spec's on your battery ie; volts - ah - etc?
Do you check the spec's on the battery when recharging and end riding results?
What is your charging ending voltage and the voltage after the 32 mile ride?
Do you charge right after the ride, meaning your battery is used up completely up at rides end, or you still have voltage remaining? What are you using as spec's for/when charging??
So many questions,
Imho,
I would get a new battery, then you have a backup if needed, and you can compare the results between the two batt's, and the OEM original batt can be used to extend your riding if needed.
ymmv