Sealey CP1200BP4 Power Tool Battery 12V 4Ah Lithium-ion for SV12 Series

Lithium-ion batteries give an all-round better performance than standard Ni-Cd/Ni-MH cells.
Maintains a higher energy density level (generally twice that of a Ni-Cd cell) giving more battery power per gram.
Has a flat discharge curve - performing better for longer.
No memory effect - these batteries can recover from a deep discharge with no tendency to reduce overall capacity.
Suitable for use with the SV12 Series.