To add to Bruce's solid advice, the cut-off and balance settings can be fine tuned to squeeze more capacity at the expense of more rapid aging and conversely, more conservative values for extended life cycle * Ah capacity. The exact tradeoffs depend on supplier quality and cell temperature determined by I^2ESR= Pd effects that rise rapidly when the battery becomes charge "saturated" >90% SoC (state of charge) and/or "depleted" < 10% SoC = 90% DoD ( depth of discharge )
When packs expire, the ideal is when all cells expire simultaneously with >300~ 500 cycles. The reality is that charge life cycles can range from 1 > 3000 cycles depending on rates used and degree of imbalance for over/under charge. When ESR rises when depleted <10% it accelerates heat rise and accelerates differential aging.
Thus monitoring ESR, state of charge (SoC) and temperature of each cell is a critical parameter for battery quality.
THis BMS looks like an excellent tool
- try to measure this ESR parameter with your BMS and record after each cycle and/ or make a pulse charge/discharge tester with a Sample and hold.
Beware of measurement errors from inductive long wires and noise may affect perfect operation such as a CM Noise filter with a ferrite sleeve on the battery cable.
Understand that the incremental series resistance or ESR is typically < 10mOhm new and rises rapidly < 20% %DoD then restores when charged. ESR also lowers with rising temperature as well as increases Ah capacity somewhat, but also reduces the cycle life significantly.
- heat is like adrenaline to the heart. Small amounts used sparingly are useful. Too much or sustained will kill the battery.
It depends on your budget and goals. Do you prefer max power or max life cycle?
- Thermal pack conductance and temperature rise of the module is a user responsibility. Do you intend to add a heat sink?
Since the BMS has limited size Watt heatsink for balancing, this limits the charge rate when any imbalance occurs. So beware the stage 2 and 3 parameters need to be tuned to avoid overheating of BMS with aging because of need to dump power from mismatched cells rises with aging. 1=CC, 2=CV, 3=Cutoff, 4=Float or off. SO more conservative values are necessary as cells age. It's only natural.
Ref my other post