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It takes almost 3 hours to fully charge the battery with the stock charger at
12V@1.8A. With a USB charger, the fully-charged time is relevant to the
output capacity of the charger itself. For 5V@1A charger, typical time is 15
hours, while 10 hours for 5V@2A charger. Quick charge compatible chargers
would probably take less time. KC908 would measure the current and voltage
to analyze the charger and subsequently adjust the charging current. Yet, even
with the exact same parameters, two different chargers can possibly perform
quite differently. In addition, the length and quality of the charging cable
would exert influence on charging time as well.
Standard 12V(13.8V) car power sources like car battery, on-board radio
power source, cigarette lighter, are compatible for charging. While charging
on a car, a 2A fuse shoule be put in series in the circuit. In an emergency, a
12V AC source is acceptable for a temporary charging.
Once the battery voltage drops below 6.5V, the machine alarms for low
battery and shuts down within one minute. Any operation prior to shutdown
would interrupt and restart the countdown. After the shutdown, user can turn
it on and continue to use for a short period of time.
However, if the battery voltage continues to drop below 6.0V, the machine
would be forcefully shutdown to protect the battery. User cannot turn on the
machine until it has been charged.
4.2 Connector
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