Question: Can I use the components and wall power adapter included in a battery eliminator kit to power an electronic device that uses a different sized battery but the same number of cells, and if so, what additional components would I need? ... Answer: Yes, you absolutely can! The required additional components would depend on which battery eliminator kit you already have and what size batteries are required in the other electronic device you are trying to power. In the example given above, all you need to do is remove the AA Active and AA Passive Dummy Cell Batteries from the hollow black plastic AA to C battery converter dummy cases (see picture below). The AA Active and AA Passive Dummy Cell Batteries can now simply be inserted into the electronic device that uses 2 x AA batteries! It's that simple. The reason you can do this without having to get a different wall power adapter is because AA, AA, C and D batteries all have the same initial terminal voltage of 1.5VDC (brand new and unused); therefore, 2 x C and 2 x AA batteries both generate 2 x 1.5VDC = 3.0VDC, so the wall power adapters that come with our 2 x C and 2 x AA Battery Eliminator Kits are the same and rated at 3.3VDC@1A (3.3W). You may notice that this wall power adapter's output voltage of 3.3VDC is slightly greater than the voltage generated by 2 batteries (3.0VDC). 3.3VDC is within the acceptable range required by electronic devices that use 2 batteries. The electronic circuitry inside of devices that use 2 batteries is designed to operate at voltages higher and lower than 3.0VDC. Generally, the maximum voltage is about 20% higher than 3.0VDC which would be around 3.6VDC, but the exact value will vary from device to device. The low-end operating voltage of a single battery has to do with the battery's terminal voltage once it's totally discharged (end-of-life) which is typically around 0.75VDC (half of its terminal voltage when it's brand new); therefore, for 2 batteries, this end-of life voltage is 2 x 0.75VDC = 1.5VDC. Since our battery eliminator kits will always supply a constant voltage, your electronic devices will always be operating just as well as if they had a fresh set of batteries installed! AA Active & Passive Dummy Cell Batteries Slide In & Out of AA to C Cell Battery Converter Cases