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Rechargeable batteries Mono-D
The thickest one we know is this Mono-D battery also called LR20. At the time it was conceived for equipment that used a lot of power, such as toys, doorbells, devices with a motor, flashlights, etc. p>
The disadvantage is that it is expensive and that many chargers can not charge it. We also have a handy adapter that makes a mono-d from an AA battery p>