Dual cell LiPo of LFP with PiJuice Zero

[DasVinch]

Hello all,

I'm building a low current, long runtime (>2 weeks) application on a Pi Zero. Power budgets are orienting me towards a >300 Wh battery.

Since it is near-impossible to source a single-cell battery this size, what I'm seeing is mostly is mostly 7.4V LiPo and 6V and 12V LFP batteries.
e.g. https://www.lithium-polymer-batteries.com/370wh-lithium-polymer-battery-pack-lp9065115-2s5p-7-4v-50000mah/

I understand that might be unsupported territory... but:

With an adequate charge profile and battery configuration, is it possible at all to make the juice Zero work with dual cells 7.4V LiPo / 6V LFP batteries? Will this plainly not work? Recipe for disaster? Or has it been figured out?

Thank you for your assistance!