mc 1.15.2
forge-1.15.2-31.1.14
Powah-1.15.2-1.1.4
Mekanism-1.15.2-9.9.10.402 ( generator, tools )

If you place a Binding card ( dimensional ) bound to a player ( me)
in the powered Player transmitter (nitro) ,
and then try to place any mekanism item (miner, cubes ) , that uses Rf/FE , same owner, the game crash.
after restart ( world ) the item is there and working.

removing the card, you can place anything you want

no problem with omega craft ultimate EDS,
no problem with your energy cells
no problem with rftools powercells ( are not charging in inventory)

it may a mekanism problem, I just wanted to notice

regards

Ok i will try to see what's the problem, thanks for reporting.

Crash report?