Double A rechargeable batteries are by far the most commonly used, but there are definitely times when C-cell and D-cell batteries would be handy to have around. Rather than provide rechargeable cells in a variety of sizes, Sanyo’s Family Battery Charger Kit comes with four AA batteries and a set a ‘FlexBat’ adapters, hollow plastic cylinders that act as spacers to allow you to use the rechargeable AAs inside C- or D-cell-sized spaces. Of course, the AA cells won’t run as long as the larger cells would, but in a pinch it’s a handy way to always have the size of battery you need available.
Read – Catalog Page [BoysStuffUK via RedFerret]