Batteries.

[crowdpleeser]

What is the difference between duracell and duracell ultra and duracell plus? Surely it's a scam made up to make us pay more? Has anyone apart from duracell actually tested the difference between them?

[mikewall01]

Duracell make a variety of batteries for different uses. The standard battery, Coppertop, is for general purpose use. The Ultra is for electronic devices that require high power. Then there is a range of speciality batteries, each with a specific purpose. Check further info on Duracell website; http://www.duracell.com/batteries/

[anthomson]

Used to write software for Duracell to test batteries - so they do take their research very seriously. For example 'shock' can seriously shorten the life of a battery - so you would expect different designs of battery to work better in remote control cars.

[crowdpleeser]

still not convinced. Especially from an ex employee of duracell!

[lisaj]

Taking AA batteries as an example, the Duracell Plus (aka Copper Top) are an alkaline manganese battery with a nominal voltage of 1.5V, they weigh 23.8g and have a capacity of 2,850mAh. Duracell Ultra is also an alkaline manganese battery also with a nominal voltage of 1.5V. They weigh 24.4g and have a capacity of about 3,200mAh. This capacity their datasheet doesn't provide as a listed figure, but I've estimated it from a logarithmic graph. It would seem then that Ultra do hold more energy in them, even if it is marginal.
As to where I got this data from, don't ask!