Think of internal resistance as the weight that is being added to a battery over time as it ages that will not allow the battery to perform it to the full extent, for a battery to perform satisfactory it has to supply useful amount of power to the device that is being used as required by the device a new battery has low internal resistance and thus it will be able to supply the required power, but as a battery ages or if a battery is damaged it’s Internal resistance …

To test the storage capacity of a rechargeable battery like NiMH you need a battery charger / Analyzer like the La Crosee BC 900 / 700 Series or the Maha BC9009  and they have a mode to test the capacity of the batteries.
How do you measure the capacity of the battery

The only way to find out the true capacity is to fully discharge the cell at a fixed current, and measure the time it took and the capacity of discharge in (mAh) that is why the test modes in the …

Look around you, digital camera, remotes, mp3 players, gaming controllers, toys, flash lights  and other other little gadgets that you use, if I am not wrong most of these use “AA” / “AAA” batteries to power them,  like it or not but we are surrounded by batteries and you might be using Alkaline batteries or the older normal Zinc Carbon batteries in them, the problem with these batteries are that once you use them you just throw them,  image the amount of waste that is being generated due to disposal …