Although I have used lipos extensively in my RC hobby, for safety reasons I would not be happy leaving them unattended whilst charging at work or having them lying around in my house.Why don't you get a lipo setup? It would be lighter and because you won't use a lot of amps you should have several hundred of cycles out of it.
I know they are fine if treated with respect, but that's me.
My larger 3000 mile/two year old pack has over 750 cycles on it already. Technically these will out perform lipos cycle wise.
Regards
Jerry