Battery Life Test Kit includes essential materials and and online instructions to assemble a basic electric circuit to test general purpose alkaline (dry cell) batteries.

The basic kit includes material for testing one D size battery (as shown in the picture). If you need to test 3 D size batteries at the same time, then you will need 3 of these.
The standard kit includes materials for testing up to 4 AA size batteries at the same time. (Not shown hear. Click Here to see a picture and more details)