Some background first.
I have a 99 Venture. Early last year I was having charging issues and ended up putting in a new stator (buckeye), new stock rectifier, and new battery. Had no issue the rest of the year. The bike was stored under a porch this winter, so it was exposed to New England cold all winter. I didn't have a way to hook up my battery tender so the battery did unfortunately drain dead. I charged it with my trickle charger until it was full a few weeks ago. I've only ridden the bike half a dozen times this year.
The problem I'm having has happened to me twice now within the past few weeks, and it happened after the bike sat for 4 or 5 days. When I turn the igition into the on position I can see my trip odometer and it is where it last was and the clock is set correct. When I start the bike it seems the electricity is lost to the dash and my clock and trip odometer reset. I assume my stations all reset too.
Did a voltage test.
Bike off - 12.6
Ignition on - still roughly 12.6
While starting - drops to 9.7
With throttle - 13.8
So it appears to me that maybe I have a dead cell. I'm just not positive if that voltage drop is too much while starting the bike. My connections at the battery seem good. Is there something else I should check or should I just go get a new battery?