I was told about putting them in the freezer works well, you just need to make sure there at room temperature before you charge them.The one thing that I have seen come into play more than anything else is how the batteries are stored in the off season. I've had a mix of SMC and Fantom 1 cell packs for the last 3 years and had one of each fail. During the summer I typically charge them to about 40% and toss them in the freezer. The two that failed on me were the ones I left in the cars after the last race of the season. The others that were stored in the freezer have stayed very close to the numbers when they were new.
If you take care of them they should last you for many years :thumbsup:
Good idea.I've got some 4S packs that I use in E8 that I stored in the freezer off-season. I wrap them in bubble wrap and put dessicant packs in with them inside plastic bags before freezing them. The bubble wrap acts as an insulator to slow the temperature change rate when "freezing" and "defrosting" them. I don't take them out of the plastic bags until they have been out of the freezer for 3-4 days and are back at room temp and the dessicant prevents any condensation. Probably overkill but as a friend said about me: "You do everything overkill."
After 3 years using the 4S thunderpower packs I decided to buy new ones, 40C compared to the old ones 25C stored in the freezer for two winters. I can't tell any difference on the track.