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I want to conduct this experiment with a multimeter only. What sort of load do I put? I used a Sony Li-ion Np-BPL battery model and after full charge, I put the battery across a load of 1k Ohm; however, the battery discharged suddenly in 5-6min. Its voltage was 4V at the charged state and it dropped to 0.10V. Why did this happen? What should I correct?

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    \$\begingroup\$ Link to the exact data sheet for the battery. Read the data sheet. See how they perform load tests and don't be surprised if they do a constant current load test i.e. more complication than what you want to do. \$\endgroup\$ – Andy aka Jun 19 at 14:38
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    \$\begingroup\$ I totally agree, but nevertheless there seems to be something wrong here with the battery. It should not drop so quickly with a load of only 4mA. \$\endgroup\$ – jusaca Jun 19 at 14:40
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    \$\begingroup\$ You need to say more about the history of the battery. Was it left discharged for a long time before you charged it? If so, @jusaca is probably right, and the solution is probably a new battery. \$\endgroup\$ – Brian Drummond Jun 19 at 14:55
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    \$\begingroup\$ Something is wrong the battery, or wrong with the setup. \$\endgroup\$ – JRE Jun 19 at 14:55
  • \$\begingroup\$ Take care that the battery does not fall below the deep discharge limit if you are not using an automatic load cut-off. This can and will destroy the cell. \$\endgroup\$ – A.R.C. Jun 22 at 8:45

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