This charge for 8 hours, I looked at the indicator at this time is a red and yellow, the charger has no sound. Shouldn't the instructions be one red and one green?
---- The resistance designed or selected of the charging control circuit is not accurate. When fully charged, the two-color light is lit at the same time (red and green = yellow or orange). Normally, it is red and green, but now it is both red and green.
Then I unplugged it and a few minutes later, the two lights turned red and the charger buzzed.
Question Is it normal?
---- Normal, but will stop after 3~ 5 minutes will not refill.
Does it take a few hours to turn into a red and a green?
---- Not necessarily, it may turn green if the temperature affects the resistance value of the resistor on the control circuit.
The second time I charged it for 9 hours, I still went from 2 red to 1 red and 1 yellow.
----- Your charger's charge control circuit is not accurate, it can be used.
It's not normal. Battery car charger 1 red light 1 yellow light is full or not full meaning. Under normal circumstances, the battery car will only light a red light when charging, which means that it is charging, and it will always be green after it is full, but it will not flash.
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If the charging adapter has a component problem, its parameters will be offset, and at this time the charging will show an anomaly, that is, we often say that the charging has been red, do not jump green.