I got tired of replacing lead acid batteries every three years. Admittedly, the bike sits for weeks and sometimes months without a charger or tender attached so I can't blame the chemistry entirely. I've owned 1910 for over two decades so I've seen a few batteries. For the last 8 years I've been following a certain Li-ion chemistry that few have probably heard of. It's not as energy dense as NCA, NMC or LFP so most have likely never heard of it. It's Lithium Titanate Oxide (LTO) and it's easily the most durable of the various ternary and LFP flavors possessing four or five times the charge cycle life and capable of delivering huge amperage even at -20C. While it's not ideal for EV traction batteries it is just may be better than lead acid for many 12V applications. Unfortunately, until recently, it's always been prohibitively expensive. LTO is known for accepting huge C-rates (charge and discharge), having very wide operational temperatures -20C to 60C, and amazing cycle life but with a cell voltage of only 2.4V it was never available in 12V form. I had contemplated building my own 12V battery from six 30Ah LTO cells wired in series. They're available from eBay for about $50 each but after adding the necessary BMS I felt the cost wasn't worth the gamble.
Recently however, new 12V LTO options have become available for around $200 so I gave in and bought one from TYKOOL. It's their LTT20L-BS (or LTT20-BS if you want the orientation of the terminals switched). I've only had it about two months so far but no issues to report. My SuperX now cranks as well as it ever has. I just tried it this morning after letting it sit for nearly 3 weeks and it cranked over like it had been sitting on a tender. I was initially worried about the low 10Ah rating and the resting voltage falling below 12.6V. It will take a 14.5V charge and hold above 13.5V for a few days after turning off the bike but it will slowly settle down to about 12V. Letting it sit for 3 weeks (with several nights falling into the low 40's) didn't seem to affect it one bit though. The voltage seems to settle after a week or two and hold at about 12.0V. I suspect that in order to keep costs down they used cheaper 5Ah cells in a 6S2P arrangement.
Anyway, I'll be the guinea pig for this test. We'll see how it holds up in the heat. I'll update as the Summer goes on.
