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?