Apparatus and method for measuring battery charge level of...

Details Apparatus and method for measuring battery charge level of... Apparatus and method for measuring battery charge level of...

2011-03-29

2011-03-29

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

07915862

ABSTRACT:
Disclosed is a method for measuring a battery charge level of a portable terminal having a removable back-up battery. The method includes determining that the back-up battery is connected in parallel to an main battery of the portable terminal, disconnecting the main battery from the back-up battery for a period of time in a cycle, and checking voltage levels of the main battery and the back-up battery to measure a charge level of each battery while the batteries are disconnected.

REFERENCES:
patent: 5623193 (1997-04-01), Lang et al.
patent: 6229287 (2001-05-01), Ferris et al.
patent: 7133703 (2006-11-01), Aoshima et al.
patent: 7449864 (2008-11-01), Kwon et al.

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