Hello Felix,
>>1. Could modification battery detect voltage? if yes, How to change it.
On SabreSDP board, 2 MAX8903C chargers was used, the chager IC can only charge battery with 4.2V full voltage, so voltage that needs to be detected should be max 4.2V, if you are using Li battery with 3.6V, you don't need to do any modification.
>>2. What is the minimum current requirement, when the power from DC in switch to battery?
At differenct charging stage, Charging current is different, it is determined by charger IC, so you had better read MAX8903C datasheet carefully.
Have a great day,
TIC Weidong
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