The L21 battery is a 6.0V 10amp/hr multi-purpose rechargeable battery.
Although the L21 battery is specifically designed for use with the L210 (Old Type) of Duolite and the L360 rechargeable handlamps; this versatile sealed battery can also (with a little adapting to the energiser connections (requires cutting off and replacing the terminals), be used with the P1 Kestrel and P150 Harrier electric fence energisers.
All Hotline re-chargeable batteries are sealed and fully maintenance free.
