My Shorai is 4 years old and I've used a trickle charger on it during winter ( sometimes) . It finally went dead , I would feel fine getting another one . Yes they don't like the cold , everyone with Lith batts say to warm it a bit with a headlight drain. I did see another batt at the bike show called a Mirai . USA made ad they say they balance the cells before making each batt. (says it helps the cells from charging at different rates) Price was better so I may try it this time