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Регистрация: 03.07.2010 Последняя активность: 10.10.2022 08:53
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USB LiIon Charger BH-042100-02U
![]() ![]() ![]() This is a cheap LiIon charger from Ebay, does it work? ![]() I got the charger in a envelop from Ebay dealer: buybtyhere It included the charger and a thin USB cable. ![]() The USB power connector is placed on the back of the charger. ![]() The user interface is a led for each slot, it will show red while charging and green at all other times. ![]() The back has the usual label with specifications, but they are not very precise. ![]() ![]() The connection are the common slider style that can handle from 31.5mm to 69.5mm, this means a few protected 18650 will not fit and the new xx700 will not fit. ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() The charge current is on the high side for small batteries and of course the voltage is too high for all batteries. Measurements charger
![]() The charging is a rather bad CC/CV charge curve around 600mA and the charger never terminates, instead it charges to 4.3V. The charge circuit goes into oscillations at one point during the charge (This is probably a combination of voltage and internal resistance of the battery and do not show up on my other curves). ![]() Slot #2 is similar, but it do not oscillate, it is slower to charge and have a lower termination voltage, but still way to high. ![]() I did not try with a lot of batteries, due to the high voltage. This cell was charged in a similar way to the above. ![]() Simulating a long cable or a weak charge do not affect the charger much ![]() The charger maintain same charge speed with two batteries. ![]() M1: 34.2°C, M2: 35.2°C, M3: 44.5°C, HS1: 49.9°C ![]() HS1: 45.6°C ![]() ![]() There is a constant current generator for each slot inside the charger, it will use a low current for fully discharged batteries. Tear-down ![]() ![]() What is inside this type of cheap charger? The bottom was five screws and the circuit board was one screw. ![]() Not much on this side, only two dual color leds and the battery connection. ![]() ![]() ![]() Not much on this side either, only one unmarked chip for each slot. Each chip has two resistors and two capacitors. ![]() Conclusion This is not a very good charger, the main issue is the high charge voltage and the secondary issue is that it never terminates. Notes The charger was supplied by a reader for review. Here is an explanation on how I did the above charge curves: How do I test a charger
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My website with reviews of charges, batteries and other stuff: http://www.lygte-info.dk/ |
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Ходэн (05.12.2019)
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