Li-ion Battery - What level of battery should we charge

Đang dính vụ sửa 1 bo mạch sạc dự phòng. Phải điều tra tài liệu về pin li-ion. Ngộ ra là nếu ko sạc full (<100%) thì tuồi thọ (số lần charge tiếp) mà vẫn đảm bảo capacity tốt hơn.
Tiện thể tìm cái app notify khi pin level đến 1 mức nào đó.
Mặc định khi gần hết pin < 15 hay 10% và khi charge full android sẽ notify.
Mình muốn noti ngay khi pin tầm 70%.
Ko có chuyện tự ngắt sạc bằng phần mềm được trừ khi smart-battery.
Một số dòng laptop như của sony có chế độ sạch 50% (driver + phím tắt).

Sẽ update các phần hay về pin li-ion sau.

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