Rechargeable Batteries RX20/D Size
RX20 rechargeable batteries by Duracell, Panasonic, Powercell, Uniross, etc.
!

Uniross RX20/D B2 NiCad 1700ma Rechargeable Battery 2 Pack
!
Larger picture 
2 Pack of D size rechargeable batteries.
Part of the Uniross standard range.