In my case it's for an ssto with 6 plasma engines from near future propulsion mod, with each using 1000 EC/s at full power. I use 2 normal 2.5 diameter batteries as buffer and 6 2.5 diameter realbatteries, I noticed that each can provide around a 1000 EC/s when properly cooled with 4 small radiator panels each and I also use 2 nuclear power generators of 500 EC/s each. So the realbatteries only have to provide power for 5 engines and can theoretically provide power for a bit more than 6 engines.
When in space with everything ambient temps and starting engines at full throttle, the EC drops drastically but when it reaches the lower hysteresis limit, the realbatteries can't provide enough power quickly enough to provide power for the engines. So I have to lower my throttle till the realbatteries can provide their full power.
I did notice how the lower and upper limit works for the batteries, but in this case the lower limit is to low for me. So if you could change it so it is configurable, would be really nice.
I have no problem with the limits with lower power drains, but these are very high loads and not available in stock except maybe if you use 50 ion engines or so