I personally haven’t been okay with leaving batteries charging unattended for a long time, just too paranoid about something going wrong (can’t sleep peacefully) and destroying most of my stuff and possibly somebody elses. Too high risk vs reward.
New pack build has been going quite nicely though.
I did the first submersion test with the XT90-panel connector attached to the back of the pelican case (empty insides) and found it to without any extra sealing material to not leak any air out on it’s own, but after pressing the sides of the pelican case in, it did produce some air bubbles meaning that water was getting in and air was coming out. I then redid the test with some hot glue added onto the mating surface of the connector and re-heated it before bolting the connector back onto the back panel. Absolutely watertight, couldn’t get any air bubbles to come out even with rigorous pressing on the case.
Going to visit a hardware store today to get some foam tape to add around the cell pack’s exoskeleton to insulate it from vibration and cushion any harder hits from the pelican case. I personally started to work on this new pack with ruggedness in mind. It will most likely also house the first FlexiBMS and work as a test platform for it.
@evoheyax , live and learn, this is the mentally I have developed as an engineer. You lost one pack, improve on the next one! No bodily harm was caused to anyone, just monetary loss, so no reason to not keep going forward and learn from past mistakes.