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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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