Disconnect both battery cables or one?

I always do both but noticed when boat was winterized last year they just disconnected the positive cable. OK or ? Just wondering.

One is fine to prevent discharge, but I always do both. That way, when I hook up everything in the spring, ALL the terminals get cleaned, both negative and positive.

No need to disconnect both, but like Ron stated, it’s a good idea to clean and tighten all terminals in the spring.

Thanks

I do both. It only take 5 more seconds

Would you do any if you have a battery kill switch? I’ve never taken my boat battery terminal off during the winter. I completely remove my RV batteries but that is because I store the RV away from home.

SuperDave1959 wrote:

Would you do any if you have a battery kill switch?

I have a Perko selector switch in mine. I had planned on just turning it to off, but when I had it winterized, they suggested turning it to off and disconnecting, just in case something is wrong with the switch.

Ralph Wiggum wrote:

<div class=”d4p-bbt-quote-title”>SuperDave1959 wrote:</div>
Would you do any if you have a battery kill switch?

I have a Perko selector switch in mine. I had planned on just turning it to off, but when I had it winterized, they suggested turning it to off and disconnecting, just in case something is wrong with the switch.

LMAO! Disconnect in case the reason you bought a switch doesn’t work.

SuperDave1959 wrote:

LMAO! Disconnect in case the reason you bought a switch doesn’t work.

Right?

I’d have been fine with just turning the switch to off, but they disconnected the batteries, so I just left them. I guess that 100% removes any possibility of a parasitic drain killing a battery.