Replies to This Discussion

Permalink Reply by Hans Mutzbauer on June 18, 2014 at 12:35pm

Batteries are usually not good or bad, batteries are new, used or worn out.

Battery testing is difficult, needs a lot of experience to interpret measuring results, information and time. The measuring equipment itself is not extremely complicated.

Different battery chemistry needs different test parameters and interpretation of the results.

In general:

Fast test - make sure that the battery is completely correctly charged according to manufacturer specification. Connect a suitable load and monitore the voltage drop. If you have lead based batteries, it gives you an estimation.

Long test - make sure that the battery is completely correctly charged according to manufacturer specification. Connect a constant current load to discharge the battery down to the cut-off (end of discharge) voltage according to manufacturer specification. Count the hours. Multiply the Ampere of your constant current load by the hours and you have the available capacity in Ah.

In the field, if you consider the age of a battery and what the customer reports, very often the situation is that clear that it is not worth a test.

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Permalink Reply by Yotam Ariel on June 18, 2014 at 4:39pm

Thank you so much, Hans. Very clear and helpful explanation!

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Permalink Reply by Rolland Zhang on July 9, 2014 at 9:31am

Bring several Resistance for test,

it should be more quickly idea.

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Permalink Reply by Yotam Ariel on July 9, 2014 at 6:25pm

Thanks, Rolland. What does that mean?

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Permalink Reply by Rolland Zhang on July 9, 2014 at 7:13pm

Normally we test battery in factory is use a Continues Power load to discharge the battery, the Load is a resistance load.

in the field, it is difficult to take a test machine here and there, so that we can use some resistance to test the battery
1. can the battery discharge
2. How long does it discharge,
it should not very accurate, but it may help you judge the battery.

Btw, the connector of resistance can be USB, 2WIRES, DC5521 or others.
the resistance voltage can be 5,12V,

Sometime, I also use the 10watt/5V resistance to test the power bank.

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Permalink Reply by Yotam Ariel on July 9, 2014 at 7:22pm

Thank you so much, Rolland. That's very clear and helpful. 

Thanks again for this help.

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