The MTU01X is a Li/ion rechargeable battery with an economical design to suit handsets. This model fits our new range of handsets, the SC100AU & SC101AX. Previous handsets are also supported, D5130GB, D5131GB, D5141 & D5142. The MTU01X is a Li/ion rechargeable battery with an economical design to suit handsets. This model fits our new range of hands..