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Can I put it on the charger after charging the battery?

Can I put it on the charger after charging the battery?

Those who have read the "Lithium Ion Batteries" one after another will understand quickly, but as to whether the charger produced by a domestic manufacturer satisfies this charging method, the senior researcher of the battery technology research team at our research center is confident. I sent the test results with the battery and charger for Samsung SCH-400 of.

The bottom line is good.


I monitored the charging voltage and current while charging the medium-capacity battery in the lithium-ion battery household charger for the SCH-400 that I am using.


As for common knowledge of general lithium-ion batteries, the maximum charging voltage is 4.2x2=8.4V because SCH-400 is a two-cell type.


Connect the battery in the state of using about half of it (we call this state 50% SOC) to the charger... At this time, connect the voltage terminal with a voltmeter (7 decimal places) in parallel and the (+) voltage terminal with an ampere meter.

The charger and the battery pack are connected to each other through the connection. At this time, 7.6V was taken during the initial charging phase (although the battery is already 50% charged, but the start is referred to as initial) and 560mA of current flowed. Over time, the voltage gradually increases and the current gradually decreases...

I haven't seen any moment, but the charger was already lit green.

After about 2 hours, the voltage was kept at 8.28V and the current was about 15mA.

After 3 hours, the voltage is 8.19V and the current finally shows "0".

After 3 hours, the voltage of 8.29V was intermittently applied, and at this time, 13mA of current flowed repeatedly.

However, this phenomenon only takes about a few seconds.


In the initial stage of charging, charging is performed using a charging method close to constant current charging (because the current is not accurately controlled), and overcharging is prevented by using a constant voltage at the end of charging.

After charging is completed, if the voltage falls below the preset voltage (about 8.18V in this experiment), an algorithm that charges with a constant voltage of 8.29V is used.

At this time, the current flows approximately 13mA.


At least in the case of the Anycall charger from Samsung Electronics (manufactured by Anam Precision), it was confirmed that there was no problem at all even if the charger was put on for a week or ten days with the green light on.

Currently, there are many ICs for charging lithium-ion batteries in Japan and the United States, and it is believed that one of them is probably used. Even after the green light on the charger, it takes less than an hour, but current continues to flow. In other words, when the green light is on, it is judged that the charging is approximately 90-95% completed. (Summary) In general, it can be seen that constant current charging at the beginning of charging and constant voltage charging at the end of charging, as well introduced by SONY. It is judged that the upper charging limit voltage is probably 8.3 V.

Because one voltage for charging per cell of a lithium-ion battery is 4.2V, and for some cells, it is judged that 4.15V per cell in the middle is used because the battery supplier suggests using 4.1V as the upper limit of charging for long use .

The answer to the question of whether it is good or bad to put a charged battery in a charger, which has recently become a lot of controversy, is okay.

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