11-10-2017, 07:35 AM
The advent of Low and No Maintenance batteries has altered much of the following traditional information about batteries.
Life is shortened by long periods undercharged or, worst, flat, by overcharging, and by repeat cycles, especially deep, and by a lot of very slow charging (as distinct from floating). In their day most Sevens suffered the first three and life was often short.
For typical modern use, with little night running, a modest summer charge perhaps interspersed by none and maintained by a modern bench charger would seem near ideal, provided initial charge rate when low is about 4amps min (for 80 ah) and voltage on charge is suited old style batteries, and does not exceed about 6.9 v after initial charge.
Life is shortened by long periods undercharged or, worst, flat, by overcharging, and by repeat cycles, especially deep, and by a lot of very slow charging (as distinct from floating). In their day most Sevens suffered the first three and life was often short.
For typical modern use, with little night running, a modest summer charge perhaps interspersed by none and maintained by a modern bench charger would seem near ideal, provided initial charge rate when low is about 4amps min (for 80 ah) and voltage on charge is suited old style batteries, and does not exceed about 6.9 v after initial charge.