Platinum rechargeable batteries are precharged and ready to use right out of the package. Batteries maintain charge three times longer than standard rechargeable when not in use. No memory effect so batteries won"t lose charge capacity over time. Battery Type: NiMH Rechargeable Battery Size: AAA.RAYPL7244. PL7244. Ray-o-vac Ray-o-vac Platinum Rechargeable NiMH Batteries.