Well, my idea is having something ike single-use-batteries, just for Tier 2 and Tier 3. We already have them for Tier 0 (Redstone, Ultra-Low-Voltage) and Tier 1 (Single-Use-Battery, LV). Now i suggest the energy gem (Tier 2, MV) and the Lapotron Energy Cell (Tier 3, HV). The energy gem is made like this:
RRR
SLS= 8xEnergy Gem
RRR
R being Redstone, L being Lapis Lazuli, S being Single-Use-Battery. An energy gem stores... Well, it doesn't exactly store, it... has 10000 EU. The Lapotron Energy Cell is made like this:
LrL
ECE=6xLapotron Energy Cell
LcL
L being Lapis Lazuli, E being an Energy Gem, r being Refined Iron, C being a Cell (Otherwise it wouldn't be an Energy Cell) and c being an Electronic Circuit. Each Lapotron Energy Cell has 100000 EU.
The advantage of these Single-Use-Things over rechargeable things is that they are stackable.
Thanks for reading!
PS: If you think "There are no higher-tier-single-use-things cause when you have Machines for higher tiers you also have cables for higher tiers" you should know that I just wanted to say it and maybe someone else will make a better idea, something so the single-use-things have an advantage over cables. I can't think of one at the moment. Oh, and I don't think that this will be a part of the main mod, but an addon for this would be nice.