Originally Posted by
Krio
Usually the pack is fully enclosed and you let it heat up like that for close to an hour to make sure the entire pack is the same temp. Tire warmers was a poor example. We used to have a hot box that had a few 60 watt led bulbs in an insulated crate with a temp gauge sticking out the side. We'd keep the box at 110-125 and just open a small door and put the packs in and let them warm up while they charged at 1C.
Same could be said for fast charging them. You see 120 on the outside, but could have pockets of 140+ on the inside that are eating away at the lifespan of the pack.
To take an hour to warm, you have to have multiple packs (unless it’s a large turnout where it takes longer than an hour for each round). Sounds almost like a wash to me (multiple packs needed to cook them for an hour versus replacing sooner due to high charge/discharge rates).