Originally Posted by
waitwhat
That is just not true. You can set your storage voltage to 7.6v and it will charge a non-HV pack to 7.6v, which will happen above 50% capacity (nominal) where the voltage starts to climb for the last bit of the charge. The charger doesn't care and the non-HV battery is not hurt by sitting at 7.6v because it is still much lower than the 8.4v limit of a full non-HV pack. I don't know how else to make you understand that which voltage you tell the charger for storage mode doesn't mean anything. Storage mode is just something to trick uneducated people into leaving the pack close to nominal voltage. I don't use storage mode and never will. I understand to leave the packs close to nominal if I am not using the pack for a while.
I never said you had to storage mode them at the same voltage. What I said was that the general recommendations for what voltage to use for storage mode is the same for both LiPo and LiHV.
Originally Posted by
waitwhat
Go run your car for 1.5x the length of a normal race. Bring the car into the pits and put the pack on the charger. BEFORE you start charging your pack will be at either 7.4v or 7.6v. If you charge an HV pack to 8.4 it will still rest at 7.6v at 50% charge. If it is a non-HV pack it will rest at 7.4v.
It's usually 7.6V-7.8V after ~10 minutes.
Originally Posted by
waitwhat
^ Ignore the part of the red or green line above 4.2v (charging an HV pack to 8.4v) and the HV pack still holds a higher average voltage than a non-HV pack. If your packs are HV cells labeled as 7.4v cells then they have an advantage over anyone running true non-HV cells. There is a difference in chemistry between LiHV and LiPo and that manifests as a difference in nominal voltage.
Is that graph supposed to be for the same battery pack? Those curves look very similar. If you take the red line, truncate it to 4.2V (since you're only charging to 4.2V), and then shift it left it to the same starting point, you end up with basically the same average voltage over the run.
I've attempted to do just that - I just copied the red line and moved it left until the starting voltage roughly lined up - it's the new orange-like line. With my crappy artistic skills, and without knowing the source of this data, these discharge curves look very similar.
I wouldn't say I have a battery advantage with my pack. Everyone I race against has similar calibre batteries. Nobody runs a shorty in the class I run.