I have two electrodynamic 123s coming in for my jet , I think because of not having to use regulator outweighs being able to load test , also you can top them off in 10 minutes at the field if you want to . just keep up with milliamps used Been using life batteries for a while and love them , don't think ill go back to ions ,although I'm using them in my 35% yak , when I change over ill get rid of the smartly also . MHO