1 SERIES - Battery Adapter - Converts 3 AA Cells to 1 D size - outputs 4.5V USA

1 Each - SERIES AA Battery D CELL Adapter Holder 4.5V Cell Converts 3 AA 1.5V to 1 D Size 4.5V               Sold by (1) EACH, of the 3 AA to Standard 1.5 volt D Size Adaptor Get the adapter style you want to be shipped by Fast Economical USPS First Class Mail   This AA to 1D - Size adapter puts AA-size batteries in D CELL devices. These adapters are normally used with rechargeable Ni-MH, Lithium AA batteries to take the place of a D cell in a flashlight. Now you can use the rechargeable AAs you already have to power your flashlight. Battery adapters allow a combination of series and parallel 3AA to 1D battery adapters for longer run times or higher voltages for brighter LEDs - Parallel adapters put AAs in parallel to boost Capacity - Series adapters put AA's in Series to boost Voltage brighter LEDs For example: 2 (1.5V Cell) and (3.6V Li-Ion Cell) lights for: 3 Volts (1.5V Cell) and 7.2 Volts (Li-Ion) = 2-parallel adapters   6 Volts (1.5V Cell) and 14.4 Volts (Li-Ion) = 1-series and