Li-Ion battery charger from junk
Many, probably, have a problem with charging a Li-Ion battery without a controller, I had this situation. The killed laptop was delivered, in the accumulator 4 banks SANYO UR18650A were alive. I decided to replace in the LED flashlight, instead of three AAA batteries. The question arose about charging them. Having rummaged in an Internet I found a bunch of circuits, but with the details in our city is tight. I tried to charge from charging the cellular, the problem is in controlling the charge, you need to constantly monitor the heating, from charging otherwise the battery skull at best, and then you can make a fire. Decided to do it yourself. I bought a bed in the store under the battery. At the flea market I bought charging. For the convenience of tracking the end of the charge, it is desirable to find a two-color LED that signals the end of the charge. It switches from red to green at the end of charging. But you can and normal.Charging can be replaced with a USB cable, and charged from a computer or charging with a USB output. My charging is only for batteries without a controller. The controller I took from the old cell phone battery. It ensures that the battery is not recharged above 4.2 V, or less than 2 ... 3 V. The protection circuit also saves from short circuits by disconnecting the bank itself from the consumer at the moment of short circuit. There are DW01 chips on it assembly of two MOSFET-transistors (M1, M2) SM8502A. There are with other markings, but the schemes are similar to this one, and it works the same way.Cell phone battery charge controller.Controller circuit.Another controller circuit. The main thing is not to confuse the polarity of the controller soldering with the bed and the controller with charging. The “+” and “-” pins are indicated on the controller's board.In bed near the positive contact, it is desirable to make a clearly visible pointer, with red paint or self-adhesive film, in order to avoid polarity reversal. I put it all together and that's what happened .Charges great. When a voltage of 4.2 volts is reached, the controller disconnects the battery from charging, and the LED switches from red to green. Charging is over. You can also charge other Li-Ion batteries, just use a different bed. Good luck to all.
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