I would suggest dropping the PM and using a uBEC connected to the outputs with JP1 in place. For current and voltage sensing use the 90A AttoPilot sensor, which will measure up to 130A when used on the APM. The output voltage for sense is scaled to 3.3V at 90A so at 5V its 130A
here's a google link to other 6S battery discussions using google
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https://www.sparkfun.com/products/10644
I would suggest dropping the PM and using a uBEC connected to the outputs with JP1 in place. For current and voltage sensing use the 90A AttoPilot sensor, which will measure up to 130A when used on the APM. The output voltage for sense is scaled to 3.3V at 90A so at 5V its 130A
here's a google link to other 6S battery discussions using google
https://www.google.ca/search?rls=en&q=site:diydrones.com+using+...
Hope that helps :)