There are different sizes of batteries available to buy and they are have various alphabetical letters to categorize them. For example the "D" battery is normally used for things like huge torches as this size and type of battery is used for portable items that need extended battery life to operate them efficiently.
It depends on the size of the boombox but most use eight D batteries. Some smaller ones use six D batteries. If your boombox sees alot of usage, you should consider investing in some rechargeable D batteries.
The Sony CFD-S350 CD Boombox requires six "D" size batteries for operation.
This would depend on the brand, but most boomboxes tend to take C or D batteries. The Sony CFD S350 Boombox, a popular model, requires 6 D batteries.
Size D.
The D Rex toy is popular for children eight years old and older. The D Rex toy requires 5 C batteries as well as 2 AAA batteries. The D Rex also has a sleep mode to conserve battery use.
The battery size used for the Sony Xplod is D and 6 would be needed.
6 Volt
You can buy rechargeable batteries of any size (including D batteries) at a local drug store. You can also get them at home improvement stores such as Home Depot and Lowes.
As the Vulcan, the Stampede needs 6 D batteries.
Rayovac and Duracell are two well known companies that provide D batteries. They have long been recognized as leaders in the battery manufacturing industry.
Flashlights, larger toys
The new lithium or titanium batteries always seem to last a long time, but I don't know if they make those in as big a size as d