(20 points) The battery information is listed in the following figure. (a) Pleas
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Question
(20 points) The battery information is listed in the following figure. (a) Please determine the current battery state-of-charge. (b) The current battery capacity is found to be 95mAh. Assume the current drain of · discharge remains the same, how long does it take to discharge the battery to almost empty (i.e., only 2.5% of maximum charge is left)? (e) The current battery capacity is found to be 95mAh. Assume the current drain of discharge remains the same and the charge rate is twice the current drain of discharge, how long does it take to charge the battery to almost full (ie, only 97.5% of maximum charge is attained)?Explanation / Answer
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(a) Current state of charge = (95mAh/1295mAh) * 100 = 7.33%
(b) 2.5% of max charge = 2.5% of 1295 = 32.38mAh
Amount of charge drained = 95 - 32.38 = 62.62mAh
Drain time = drained charge/drain current = 62.62mAh/717mA = 0.087 hours = 5.24 minutes
(c) 97.5% of max charge = 97.5% of 1295 = 1262.6mAh
Current disharge = 717mA and current charge = 2 * 717 mA
Total current charge = 2 * 717 mA - 717mA = 717mA
Amount of charge left to be gained = 1262.6 - 95 = 1167.6mAh
Time for charging = 1167.6/717 = 1.62 hours = 1 hour 37 minutes approx
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