@squeakywheel thank you so much for your detailed response.
I will only send data the seven times a day when the sensors are read for about a minute, figuring powering up and down. Hopefully I can try and shoot for around the 1000 hours mark with the Operating Current (Cellular ON, w/powersave) mode on since it is not critical that the data be immediately uploaded.
Are the LiPo batteries always being tricked charged from the AA batteries or does it recharge them at a certain threshold benchmarks?