So I found out one of my car's battery terminal is missing one of the battery terminal protector. One that is similiar to the one sold in Autozone. Is it really needed to get one for the missing terminal side?


  • For $2 why not? – Hari Ganti Mar 2 '17 at 23:59

That basically just looks like a spacer to help prevent the terminal resting too low down the battery post, a terminal that is resting lower down the post MAY be slightly more susceptible to corrosion but to be honest if the battery is not leaking etc and the terminals are kept clean there is no need for this spacer. If the terminals are corroded or even just look crusty.. Take them off, clean them up using a wire brush.. and coat them with petroleum jelly/vaseline to protect them.

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  • It's sole purpose is corrosion protection not as a spacer. The battery post and wire end terminals are tapered. The wire end terminal is to be placed as low as possible to get a tight connection. Corrosion protection washers cannot be installed on some batteries due to defects, such as stretch, in the terminals. – Fred Wilson Mar 4 '17 at 13:25
  • I apologise.. I got my washer and spacer mixed up. However even so these washers do create a space between the battery casing and the terminal base which helps prevent acid creeping up the post and creating corrosion between the different materials. – Orb Mar 5 '17 at 15:32

While these are not required they do significantly reduce the maintenance needed for cleaning terminals and can prevent damage due to acid corrosion. The following type works very well as they are embedded with a gelled oil that neutralizes the acid that almost always leaks from around the battery terminal post. We install them on every battery we sell and encourage their installation after terminal repair or cleaning.

battery terminal protectors

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