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Chinese BT189 battery tester

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Datman:
Hi all
I bought this battery tester:
https://it.aliexpress.com/item/1005001381541786.html
It reads 1.59V instead of 1,5V and 9,41V instead of 9.00V.
Current drawn is 5.35mA @1,5V (280 ohms) and 2.04mA @9V (4K4).
The internal voltage converter is a XC6385, giving 3.0V at the output. It should work at 0.9V minimum.
The third digit is a bit weird... It shows a number when I attach the power supply, but if I adjust the voltage it doesn't  change anymore... 1.51V, 1.41V, 1,31V... But if I retry, it shows 1.52 or 1.53...

I'll try to adjust it, also adding two resistors to raise current drawn (22 ohms for 1,5V and 470 ohms for 9V). I could also keep only the converter and make a new meter with a ATmega328P and a 0.96" OLED display... :)

Mechanics appear to be good.

Note: on 1.5V contacts it measures also 3.7V (3.2/4.2V) from Li-ion batteries, but they don't fit! :(

TERRA Operative:

--- Quote from: Datman on May 02, 2023, 10:30:38 am ---Hi all
I bought this battery tester:
https://it.aliexpress.com/item/1005001381541786.html
(Attachment Link)

--- End quote ---

Good for you?  :-//

wasedadoc:

--- Quote from: Datman on May 02, 2023, 10:30:38 am ---Hi all
I bought this battery tester:
https://it.aliexpress.com/item/1005001381541786.html
It reads 1.59V instead of 1,5V and 9,41V instead of 9.00V.
Current drawn is 5.35mA @1,5V (280 ohms) and 2.04mA @9V (4K4).
The internal voltage converter is a XC6385, giving 3.0V at the output. It should work at 0.9V minimum.
The third digit is a bit weird... It shows a number when I attach the power supply, but if I adjust the voltage it doesn't  change anymore... 1.51V, 1.41V, 1,31V... But if I retry, it shows 1.52 or 1.53...

I'll try to adjust it, also adding two resistors to raise current drawn (22 ohms for 1,5V and 470 ohms for 9V). I could also keep only the converter and make a new meter with a ATMEGA328P and a 0.96" OLED display... :)

Mechanics appear to be good.

Note: on 1.5V contacts it measures also 3.7V (3.2/4.2V) Li-ion batteries, but they don't fit! :(

--- End quote ---
Do you believe that a 1.5 volt cell always gives exactly 1.5 volts and a 9 volt battery always gives exactly 9.00 volts?

Datman:

--- Quote from: wasedadoc on May 02, 2023, 11:06:58 am ---Do you believe that a 1.5 volt cell always gives exactly 1.5 volts and a 9 volt battery always gives exactly 9.00 volts?

--- End quote ---

Obviously, no. Otherwise, battery testers would be useless!

I wrote:
"It reads 1.59V instead of 1,5V and 9,41V instead of 9.00V."
but I didn't write I measured a battery.

tunk:
A new alkaline AA is ~1.6V, and a new alkaline 9V battery should be around six times that.

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