Energizer e300487800 size aa alkaline eco advanced xr91 battery pack of 20 energizer e300487800 p a bulk pack of energizer ecoadvanced xr91 aa batteries for use in a wide range of aa compatible electronic devices p p these single use eco friendly batteries are the result of advanced and revolutionary new manufacturing techniques that enable them to be produced using 3 8 of recycled battery material additional advances in the manufacture of this battery have given them an extra long