Well my pallet of very well protected/packed batteries arrived today, only opened one up so far to check. Main battery terminals are on the smallest side of the battery, there's channels for airflow through it for active thermal management if needed, and there's a 10-pin balancing connector (no BMS on the battery module itself), with a little fuse block for the balancing connector on the side. Will start testing these modules next week:
I also got my Leaf module today (newer type, 500WH). I made up a couple cables to connect it to my 10A battery tester, and re-wired my other battery current/voltage monitor so I will be able to check the split of current between the Leaf module and the "extender pack" which is starting with the Boston Power Swing 5300 cells in 2s2p:
Should be able to start that test cycle tomorrow and have it run through the weekend. At only 5A charge and 10A discharge it will take around 15h for charging and 7.5h for discharging.