I removed the Battery Upgrade System of GT. That Concept was a bit too stupid. It is no longer possible to spam a ton of Battery Upgrades on a Machine in 1.7. However, most Machines will receive ONE Battery Slot, where you can place approciate (aka. with the correct Tier) Batteries into your Machines, which then work like inside the Battery Chargers. In addition there will be a lower Upgrade Limit.
Does this mean that, unlike an upgrade, it will be possible to swap out the battery for a more powerful battery if you later upgrade the machine with transformer upgrades? If so, will it be possible to run a machine by placing a charged battery inside (like regular IC2 machines)?