Lowest "Safe" voltage for 2s?

[crazyjr]

Most here run 3.1V voltage on their cut-off and the batteries come back to 3.3 to 3.4v per cell as they cool down. I personally run my cut-off to 3.0 and charge when cool and have never had troubles with any good pack. My maxamps puffed within a year but my hyperions and flightpowers have lived over three years and still going strong