I'm well aware of the best practices for charging lithium chemistry batteries, and how the charges themselves work.
I've never had a water tight explanation on why having a load on a battery during the CC phase is dangerous.
My understanding is that battery charging works as follows:
- Battery is charged at constant current, variable voltage
- When current flow reduces to 10% of capacity, charger switches to constant voltage (full voltage) to top the battery off
I know that if a load is present on the battery during the CC phase, the charger might not neccissarily detect that 10% threshold, my question is, why is this a problem.
Unless I'm mistaken, the charger achieves the constant current by increasing the charging voltage to the max charge voltage - e.g for 4S that would be 16.8V, it doesn't increase it beyond this.
So, you can't actually over charge the battery?
The battery voltage and charger voltage could be slightly out if there was a load on it, but it still wouldn't be over the max voltage as the charger (to my mind) does not do this.