If you have a lappack/batpack/ultimate lappack it will automatically charge your items in your hand. You need to charge them as well though but they hold a lot more than the mining drill, also you can wear a solar helmet which charges your items for you whenever you're in the sun. But yeah get a batpack first, charge it and when you can afford one get a lappack. You wear them on your back.
Haha yeah I know what it's like. Watch Direwolf20 if you don't already, everything you need to know about the mods in FTB are right there on his YouTube channel Watch his singleplayer seasons though, I feel you learn a lot more from them.
You don't use cactus green, you use waterproofing. Put the cactus green in a crafting table and you get waterproofing as a result. Waterproofing + pipe = waterproof pipe.
Correction: Waterproofing + pipe = waterproof pipe = Win!