When is the best timing to change the battery in remote controller?

Nowadays there are several remotes used at home, i.e. air-condition, tv, hifi, electic fan,…  When it comes to frequently used remotes or appliances, the batteries are quite fast changed after the appliance or remote stopped working, because it is easy noticeable. However if the appliance or remote is not that often used, there is a risk of over discharge and leakage in that appliance.  When you change batteries in the appliance it is highly recommended to change all the batteries in that appliance at once with batteries of the same type, brand, size and expiry date.

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