If the floor they are placed on doesn't decay and you make sure to power them before accessing their inventory then they would gain 10 days of charge even if the fridges were unpowered that entire time. Here is a short clip demonstrating it: At the start of the clip, you can see the pod stored into an unpowered cryofridge has 29 days and 22 hours of charge. Then I went AFK for a bit while the game was running in slomo 100. Then when I came back at 6:56, you can see I power up the