Batteries are electro-chemical reactions between terminals via an electrolyte. This reaction continues for as long as the terminals connect via a suitable resistor. When we are away for weeks, we may return to find our boat, car, or recreational vehicle starter battery has discharged because we left it connected. Since it can be a hassle to remove a terminal cable – and it could weaken the post – the easier solution could be to fit a cut-out switch.
A Word of Caution Before You Fit a Cut-Out Switch
We are not electricians, we sell lead-acid batteries. Hence this is not a DIY suggestion. We came across an idea as a possible job for an auto electrician. Nonetheless, we thought we would provide a brief explanation of how they would fit a cut-out switch. That way you could ensure the technician did a proper job.
The Procedure to Fit a Cut-Out Switch
- Obtain a suitable switch from a reputable supplier rated to handle your battery load
- Disconnect the cable from the negative post to eliminate the possibility of a short
- Now remove the positive cable. This is normally red with a plus sign on the battery case
- Fit a cut-out switch to the negative terminal as indicated. Make sure you tighten it
- Re-fit the positive cable to the positive terminal making sure not to cause a short circuit
- Check the switch is open. Attach the negative cable to the other side of the switch
Now close the switch and start the equipment. When you want to rest the battery, simply open the switch to break the circuit.
A Small Caution Before Using a Cut-Out Switch
Disconnecting a battery from a boat or vehicle wipes the memory from radios, computers, clocks, etc. Make sure you know the passwords if these have protection. Check with the dealership regarding electronics before asking an auto electrician to fit a cut-out switch.
Related
Understanding Battery Shelf Life
Lead Acid Battery Safety Rules
Preview Image: Two batteries, battery cut out switch, and fuel cell with custom fuel cap
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