On Wednesday, September 9, 2020 at 12:43:31 AM UTC-7, krasw wrote:
This is just fantastic idea. What I would like to have is a bluetooth/processor chip unit that you mount on any battery (SLA, LFP, whatever), and then monitor all your batteries status via app. There is no reason to built it inside battery. Integrate fuse holder, quality connector and you have everything.

There are advantages to having it in the battery: it can report SOC per battery, the BMS is already there doing the measurements, and the cost is essentially free. However there is a device which does exactly what you want:

https://www.thornwave.com/collection...dc-power-meter

I also have one of these. One drawback is it must be powered to retain the history, so if you remove the battery from your glider you lose that history. Another advantage of having it in the battery. They are claiming to fix this in a future firmware release.