I know what you mean ... I'm 74 w/COPD and live in an apt complex (2nd floor) & have to carry my 3 batteries down/up the steps and into the truck, then out of the truck & into the boat. That's two 29's & a 24 ... and I'm not sure how much longer I'll be able to keep doing this. I have to bring them back in to the apt. to charge them.
I run a 42# thrust TM & my 29 will run a good long while, unless I'm Pushing (trolling) all day ... then I might have to switch out the TM battery with the battery I use to run my Livescope setup.

That's kinda why I suggested a Lithium battery. (& I'm thinking about them, myself)