I'm trying to integrate a Pi-based ADS-B airline tracking system from Flightaware in the same physical housing as the GroveWeatherPi. I'd like to feed the 2nd Pi Zero W off the same solar supply in the WeatherPi but would need a bigger battery to support both overnight or during cloudy days. The biggest LiPo battery in the adafruit store is 6600mAh, but wondered if you knew what would be compatible that has a higher storage capacity? We have periods of bright sun and I have extra panels (6 total) so I should have the power to charge but also extended cloud-cover where 6600mAh may not hold over long enough, even going into sleep mode.
I know running 2x batteries in parallel is unwise but I dont see a "general spec" for what specific kind of 3.7V LiPoly is compatible.