Battery Acid around terminals on auxiliary

Some vapour / gas containing very fine droplets of battery acid may be venting around the post. Put a felt washer covered in vaseline/petroleum jelly over the post before you put on the terminal clamp.

Yeah go the felt pad under the connectors. I also spray all exposed metal around battery with lanoline spray. Does the job for me. Also make sure that you haven't put too much water in the cells. This can also cause excessive 'splashing' of droplets etc onto terminals.

Boil up the jug, put 2 or 3 teaspoons of Bi-Carb Soda in a large mug, add the boiling water and tip it over the acid build up.
Acid will desolve, wash it off with the hose and then add some of the whats in the can below.
and get a terminal cleaner

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Andrew,

All good advice above. My aux battery was doing this and then the starter batteries (2x on 100s) started to do this - ended up being a Aux battery on the way out. The alternator was trying to push huge amps into the system to charge a dying battery.

I cleaned everything up, replaced the aux battery and all's good.



Tim

Use Wurth battery terminal spray, before & after you fit the terminals.

If liquid keeps on appearing near a battery terminal, then the seal between the battery and the case is defective.

Either that, or abnormal force has been applied to the terminal.

All you can do is apply a water repellant grease at the base of the terminal to prevent the acid migrating up to the battery clamp.

Lanolin Grease is more acid-resistant than Vaseline.

Might be worth mentioning what type of vehicle - where is battery mounted, and what is the temperature like in that area.

Land Rover Disco 2 usual position for aux battery is on left hand side up close to the firewall. This position is known for the battery being exposed to excess heat from the exhaust / turbo (at least in the diesel), and I have read reports of batteries boiling / leaking in this position. Can be remedied by installing a heat shield between battery and the turbo in this case.

I've got a Disco 2 and looking at options for installing second battery. Have found a few reports on batteries overheating in this position - many Disco owners install aux battery in back of vehicle because of this.