If you want a dependable, long-lived battery, you’ve got to keep it charged — and that goes double for vehicles that see infrequent use, like boats, lawn tractors, and your babied classic car. Schumacher designed this on-board charger to be mounted inside your vehicle, close to the battery, so a topped-off battery is always just an extension cord away.
The SE-1-12S measures 2 x 8 x 9 inches and weighs about two pounds, so you can probably find room for it in all but the most cramped spaces. Like other trickle-type chargers, after it fully charges the battery it shuts off to prevent damage — it then periodically checks the voltage and applies juice as needed.
At about $30 it’s cheap reliable insurance against a dead battery.