The device being powered must be able to tolerate the 8.4v over-voltage condition (full lipos) for the duration of time it takes those cells to deplete to the nominal 7.2 volts.
A 'protected' lipo cell is only protected from over charging/discharging (terminal voltage) ~ the IC (dw01 or similar) does not control the charging profile/current rate.
The charging/current profiles for NiCd/NiMH differ from what's required to charge lipo cells (must be current limited for low cell terminal voltage), and are unsuitable.
2 lipo cells in series (2S) should ideally be changed by a 3 wire charger (tap inbetween the 2 cells)
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