Welcome to Gaia! ::

i don't know where to get more power cells for valhalla
can anyone help me?

3 power cells are on th Pirate homeworld,. 2 of them you have to get, 2 are on Elysia, one you have to get the other one is where you fought the Defence drone to get the Boost Ball, but you need the Grapple voltage, and a good supply of energy to get it, 2 are on Bryyo, one is where you got the missles for your ship in vents that will suck you up or blow you away, but you have to bomb the grates off of it. and the other one is long and confusing, though I will post it once I feel like getting on the game and walking you through it, and another one is on Norion, its at the Generator that Rundas went to power up for you, (the one you haven't visited) but I suggest you get the X-ray visor and the Nova beam before going after the one on Norion if you want to kill the Metroid hatcher in one hit (use Xray vision and look ad the bright red thing and shoot, metroid Hatcher is dead)