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Since the way of internal resistance measurement varies, it cannot be realized to measure the
absolute value as professional internal resistance tester does. Therefore, the internal resistance
value can only be referred to when conducting horizontal comparisons, such as judging the
consistency of the cells’ performance or making comparisons of the performance of different
cells. The charging current is an influential factor for measuring internal resistance; batteries
with large capacity and small internal resistance would relatively need large charging currents
to accurately measure the internal resistance.
During the charging process, the screen displays an orange marking which turns into green or
blue as the charging is completed. When the charging completes, the cells’ voltage difference
should be smaller than 20mV, while the screen marking turns into green. Therefore, if the
battery is in urgent use, it’s okay to stop charging. The charger should continue to balance the
battery if the charging process is not terminated, and the screen light turns blue, since the
voltage difference is smaller than 10mV. Additionally, the charger should continue to carry out
accurate balancing of the battery after the light turns blue. If the consistency of the cells is
excellent, the screen light should skip color green to become blue as the charging is complete.
After the charging is complete, it is normal for voltage decline to occur due to different perfor-
mances. As the number of the charge cycle grows, the performance decreases, and the
voltage decline phenomenon becomes obvious. To charge the battery with a larger current
would also cause a more obvious voltage decline after the charging is complete.
NB: When charging the battery in a hurry in outdoors, it is okay to stop charging when the
screen light turns green. If there is enough time and the cells are assumed to be well balanced,
it is better to stop charging when the screen light turns blue; alternatively, wait a little longer
after that to gain more accurate balance effects.
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