Following up after a season of using the EarthX ETX12A on a 2020 YZ450F snowbike. Battery starting power, cold weather performance, quick recharging capability, and cranking power were all outstanding all season.
This summer, my stock battery on my 2008 Yamaha WR250R dual sport started to crank a little slow. Sidebare...yes, this lead acid battery was 12 years old with about 20,000 miles on the bike. I use a de-sulfphating Battery Minder brand smart charger on this and all my powersports, boat, and vehicle batteries except those that do not allow desuphation pulses such as AGM). I have many other batteries that lasted 6 - 8 years, but I sold those bikes/ATVs so never found out how long they lasted. This 12 year old bike was a good test. But, all good things come to an end so after 12 years, I needed a new battery.
I moved over the EarthX ETX12A to try it out figuring I'd move it back to the snowbike and get another Yuasa lead acid since I can get 10+ years out of them...but I just love this EarthX lithium so it's staying in the dual sport and I will buy another for the snowbike. As much as I like fiddling with smart chargers, it's been great not putting one on the snowbike and now not on the dual sport. Lead acids lose about 3% State of Charge per day in the hotter months (less in winter) but lithium hold their charge and you don't really want to store lithium batteries totally topped off, especially in the heat, to get max life out of them. Off season storage you really want lithium sitting at 40% - 60% State of Charge. So even though I have a lithium compatible Battery Tender, I really haven't used it. I check voltage with a voltmeter to to ensure the lithium batteries don't get too low in the off season and they don't really move any significant amount. I'd really prefer they were down in that 40 - 60% SOC but they sit way higher than that all off season. If I can get 5 or 7 years out of them, they will be worth it for me.
Any lithium with a Battery Management System (BMS), I don't see any reason they should not last that many years since those will protect the battery from charging when battery is below freezing, and protect from drawing to too low of state of charge and also have crank protection as to keep it from overheating. Time will tell, but wanted to report back after the first season of use.