Voltage cutoff with 2x 2S.

[BrianG]

2.7v is probably ok for medium to small loads like cellphones and laptops, but our stuff pulls a LOT of current and the 3v/cell+ is just extra insurance. One other thing; I noticed that cells stay in balance far better if the LVC is set to 3.1v/cell or more. Lower and one/some cells can be substantially lower.

Whether you choose 3, 3.1, or 2.7, I usually follow this rule of thumb: Set the LVC point such that when you remove a depleted pack from the load for ~10 minutes, the voltage should rebound to at least 3.5v/cell.