@Tom
Kishi armors have 4 volatile energy reserves housed in their back, often called
capacitors, since they share the same role as the ones the Mindy II could install on its hardpoints. One capacitor is worth 100% power, a metric based on the amount of power required to fully recharge an entirely depleted barrier. With 4 capacitors, the nomenclature is often "400%".
Tom goes further on that concept.
On his left arm is a shield that houses inside 16 more capacitors. With the 4 default capacitors, Tom essentially has 2000% worth of reserves total to play with.
While Tom could hoard all of these for himself, the equipment on his right arm's shields - a repair tool on one side, an energy projector on the other - allows him to share that stored power. He can project a single bolt worth 100%, and project a constant stream that recharges much faster as long as Tom can keep on target (which means that it's easier to do while he and his intended target aren't moving much).
Though, keep in mind that Tom's energy recharge rate is the same as anyone else; he has a big reserve, but he's unlikely to be able to resplenish them all in combat. A Kishi recharges its barrier at a rate of 5% per second of low activity and once its barrier is full, that power then goes to filling the reserves (at a similar rate).
There are alternate ways of recharging reserves; for instance, the
Jigoku shield on Yukari's and Reika's armor emits a field similar to the Meni-Custom saber-rifle in defense mode; when it receives energy damage, a small part of it is converted in extra reserve power (i.e.: when Nyton used
Shinigami earlier, be blocked a flurry of rapid-fire aether shots, which seemed to refill 2-to-4% each).
Bear in mind it's not always a good idea to hoard your reserves, since being at max reserve power means that you're wasting your recharge rate.