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ChipTuner | 14 days ago (raw) | root | parent | reply | flag +1 
 That's quite interesting, I'll be following along! If you make it OSS I'd love to contribute. I have prosumer PCB design, LoRa, and FSK firmware and driver code experience :) I spent a ton of time on power management for AVR's  and the radios too. We had pretty strict constraints and LoRa radios can pull a ton of power.  

e-ink will be interesting, simple i suppose. 

How big is the lipo?
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Low Information Voter | 14 days ago (raw) | root | parent | reply | flag +1 
 12mm x 60mm x 110mm. Claimed 10 Ah, but I'll be happy with half.

Overkill, probable mistake, and dominates the form factor decisions, but I do miss my Nokia 3210's battery life :p