Rode my Lectra motorcycle for the first time in awhile yesterday, and the range was very bad. I'd put it on the charger just before leaving but almost immediately the pack read as being very undercharged. It's a 60v SLA pack but the Cycle Analyst showed 48 volts or so while riding, and in the past I'd only see that voltage at the end of a ride. And yes 48v is less than 10v per battery, so any time it got that low was a dangerously deep discharge.
Last year (when I was employed and had a job to go to) my 10 mile commute caused a very deep discharge and pack voltage routinely going below 50v while riding by the end of the ride. I knew it was damaging the pack and have been keeping an eye on it the whole time. However this year I've not been riding it so much and the bike has been sitting idle.
I have a paktrakr installed on the bike as well as the cycle analyst. The cycle analyst shows pack voltage and other measurements. The paktrakr shows per-battery voltage and other measurements, but I keep it on the per-battery display. It showed that the #1 battery had much less voltage than the other four batteries.
After the ride I put it on the charger overnight and this morning it was still charging. Hurm. Turned off the charger and the paktrakr reported 14v per battery except for #1 which was 13.2v and but that voltage was dropping rapidly.
This means #1 battery is not holding a charge, while the others seem to be holding a charge. The other batteries might be suffering from a bit of overcharge cooking.
I have a bit of testing to do to verify ..
a) put #1 battery on a 12v charger for awhile and see what it does
b) use the 12v battery load tester to see what the cells are doing
If it still remains that #1 battery is dead, I have a temporary stopgap idea to install another 12v battery I have lying around into the pack. That battery might not be in too good a shape either but should keep the bike ride-able for awhile. As it is the bike is not ride-able. It can also be used to test the 48v20ah headway pack I have.
Longer term I want a LiFePO4 pack and have worked out the geometry for an 80+ volt pack at 60ah, but there's a little issue of employment and money..