The chargers for my electric RC airplane Li-Po batteries charge each cell to exactly 4.20V. The cells do not get warm when charging and a full charge takes 20 minutes so the average charging current is 3C. The batteries get warm when flying with wide-open-throttle with a discharge in 10 minutes (6C).
Some new Li-Po batteries are 6th-generation and are rated for a max charge of 12C (fully charged in 5 minutes) and a max discharge rate of 45C (discharged in 1.3 minutes).
Some new Li-Po batteries are 6th-generation and are rated for a max charge of 12C (fully charged in 5 minutes) and a max discharge rate of 45C (discharged in 1.3 minutes).