ProgressiveRC 8 PowerLab - Manual (Page 58)

different number of cells together in parallel. This is less a function of the PowerLab 8
and more about assuring proper connection of packs to the PowerLab 8.)
If a pack is at 80% or less of its capacity when connected to an auto-detect speed
controller, the controller may lower its cut-off voltage. This could over-discharge the
pack during the flight. Auto-detect speed controllers should properly set cut-off voltage
if packs are charged to at least 90%.
To save time, stop charging when the pack reaches about 95% of capacity. That last
5% takes the longest. By default, User Presets notify you with two beeps when a pack
reaches 90% of capacity (that threshold can be easily adjusted using the Charge
Control Software).
Some cells may sag 0.10V within an hour after charging. This is normal as packs age.
In REVOLECTRIX’s opinion, over-discharging an A123 pack below 2.0V/cell will
damage the cells (contrary to some reports). PowerLab 8 requires a minimum pack
voltage of 1.5V to activate charging. If an A123 pack is below this voltage, do not try
to repair the pack by boosting voltage. Even if you manage to repair the pack, it will
not have many cycles left and PowerLab 8 will reject it for multiple reasons (as
indicated by displayed Safety Codes).
Storing packs
For best results, LiPo and A123 packs should be stored at 50% of capacity. Use
PowerLab 8’s LiPo All Brands Storage Charge preset to prepare LiPo packs for
storage, and the A123 All Cpcty Storage Charge to prepare A123 packs for storage.
CAUTION: Be sure the storage preset matches the battery chemistry. Using
the incorrect preset will damage cells.
LiPo packs charged to 100% should not be cooled below room temperature. Cells at
90% or less capacity can be cooled below 32ºF (0ºC).
58