Hey seb ! Rare To see another quebecer on these forums!

Go for the NIMH the only disadvantage is that they have a slightly lower discharge rate but a .40 sized plane wont be pulling 4 amps anyways....

BTW the accu cycle can charges lipos but it doesnt balance them, And a .40 sized plans are to small to see the advantages of lipos (it starts to pay off around 35% ers)