| Products > Test Equipment |
| Test coin batteries |
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| Smokey:
https://www.tek.com/en/products/keithley/dc-power-supplies/2300-series ? Probably find something used under 2K |
| tszaboo:
--- Quote from: ebastler on November 11, 2023, 07:19:28 am --- --- Quote from: tszaboo on November 09, 2023, 11:17:33 am ---Well let's say a CR2032 coin cell is 200mAh, you don't want to test a battery for a thousand hours, you would set up like 2-10mA discharge current. --- End quote --- If the goal is to check whether the supplied batteries meet specifications (as stated by the OP), I would test them under the conditions the manufacturer has specified. For the Energizer CR2032, that would be a 15 kOhm load, resulting in approx. 50 days of discharge time: https://data.energizer.com/pdfs/cr2032.pdf So I think one feature of a practical tester for incoming inspection would be the ability to test a small batch of batteries in parallel. The "Arduino ADC with load resistor" solution doesn't look too bad... The spec I would be more worried about (if this is for an application like a pocket calculator) is self discharge, by the way. About 1% per year is the spec, and I don't see a solution to accelerate the test. On the other hand, no dedicated tester required -- just put a few batteries into the drawer and take them out once a month for a brief measurement. --- End quote --- True, but if you want to check if the batteries are not meeting the specifications anymore, that's a different story. You can a-b test with a sample from a previous batch. Plus I can tell you that for free, that stopping production for a 50 day long test is going to be an issue everyone involved. You would want to get answers as soon as possible. |
| mariush:
Why not just spend money on a multimeter with data logging feature, and discharge a few batteries using various resistor values. Then import the logged data into Excel and see if the battery behaves as you should expect. If you want to test things like on-off , you could short out the resistor using a 555 or a microcontroller ... |
| HKJ:
A multimeter with computer connection, a resistor and TestController, then you can do it. TestController thread: https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters |
| Fungus:
--- Quote from: tszaboo on November 11, 2023, 10:53:09 am ---Plus I can tell you that for free, that stopping production for a 50 day long test is going to be an issue everyone involved. You would want to get answers as soon as possible. --- End quote --- You could do an accelerated test against a known-good battery and see if there's any obvious difference, eg. if the suspect battery dies in half the time. (by "accelerated" I mean over 3-4 days...) |
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