First day in the 60's here, just put a fresh battery in the 701, perfect day for a ride through wine country!
The bike has a voltmeter I installed on the dash reading from the battery. The old battery was a Shorai lithium iron that got over-discharged several times late last year, so I figured best to replace it, and got another of the same. 13.2V, warm slightly-hazy sunshine, life is great!
I guess it wasn't (just) the battery! About 35 miles from home (in a direction with mostly small twisty roads) with 12.7V and dropping, I turned back, running a gear or two lower than normal in hopes the higher revs might help charge. As I got into more-developed areas every traffic light saw another 10th of a volt drop. It just wasn't charging! As an EFI bike, there is a point where it doesn't have enough juice to run the pump/ECU/injectors, and then the party is over. That point is about 11V in my experience. The photo above is ~8 miles from home (over a range of hills) with 11.4V when I stopped. My understanding of lithium iron is that ~95% charge down to ~5% charge is remarkably flat, then it drops off a cliff, and my previous experience backs that up...so I was dialing for a tow when I said, no...I have tools, I'm smart and resourceful, I'm close, I'm riding home!
I disconnected the lights except high beam and brake light (low beam is biggest draw I can easily run without) planned my route with fewest traffic lights, highest-speed streets as directly as possible to the high point of the mini mountain-range between me and home. I watched the cycle of the lights I could see at the next intersection, timed my start carefully, clicked the key on, and with no headlight, saw 12.4V...and promptly took off. I kept the revs up, but not so high as to build excessive heat. I timed the lights and traffic to try and avoid stopping. I was glad I'm 6'2" sitting bolt upright wearing a hi-viz suit. I used hand signals to save the turn signal draw. I got to the top of the hills with 11.5V, popped her into neutral, and killed the ignition.
I coasted all of the last 2.4 miles, railing the corners as fast as I dared/traffic allowed, and only had to scooter away from one light I couldn't avoid! I don't think I even really held up anyone for more than a couple seconds! Glad I know these twisty hilly streets like the back of my hand! I did go the wrong way up the sidewalk for the last 1.5 blocks once the one-way grid became inconvenient.
Trickle charger is on the battery, and I guess I've got troubleshooting ahead of me.