ٰThe video file which I had attached to the previous post is not there any more. I do not know why.
I attach it again in this post.

By the way, let me point to another problem of the Circuit No. 2: It is unable to run on battery alone (it only runs when the charger is plugged)....

I have another circuit (let's call it Circuit No. 2) similar to the circuit I introduced in the posts 1 and 3 (let's call it Circuit No.1), but with some differences for example it has 2 ICs.

[B]Unlike the Circuit No. 1, replacing a good battery did not solve the following problems of the Circuit No. 2.[/B]

When the Circuit No. 2 was OK, its green LEDs lit up one at a time to show that the battery has charged more. But now that the circuit is flawed, LEDs light up as you see in the video: just the intensity of their light increases and decreases. When the light is more...

The DC motor in this device cannot operate while the battery is not connected to the circuit but the charger is connected. Can you suggest a modification to the circuit for enabling the operation of the DC motor while the battery is not connected to the circuit but the charger is connected?...

[B]Bravo stj!
You hit the mark: The bad battery was the culprit.[/B]
(The battery is 3 1800mAH AA NiMH cells connected in series. I fetched 3 other AA cells and connected them in series: the problem went away. Thank you very much indeed.)

1. Can you explain the differences between "re-badged eneloops" and "Lidl batteries"?

2. The DC motor in this device cannot operate while the battery is not connected to the circuit but the charger is connected. Can you show me a way to operate the DC motor while the battery is not connected to the circuit...

Why and how does it look like the batteries are done?...

I had attached all the files but they dissappeared. Again here are the attachments:

[URL=filedata/fetch?id=3559251&d=1738124584][ATTACH=JSON]{"alt":"Click image for larger version Name:\tCamScanner 01-22-2025 18.13_1.jpg Views:\t0 Size:\t939.1 KB ID:\t3559251","data-align":"none","data-attachmentid":"3559251","data-size":"thumb"}[/ATTACH][/URL] [URL=filedata/fetch?id=3559252&d=1738124609][ATTACH=JSON]{"alt":"Click image for larger version Name:\tCamScanner 01-22-2025 18.13_2.jpg...

Hi friends of electronics

What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.

The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.

[B]Please help me fix this circuit[/B].

(the datasheet of the IC: [URL]https://pdf.datas...