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I have small toy and it’s not used for three weeks, later I found out one side of the battery holder at (-) negative polarity spring got eroded. I knew battery gets discharged without using the device but how come the chemical reaction occurred and entire spring disintegrated?

Battery got discharged and eroded the spring

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    \$\begingroup\$ My guess: You have been using cheap zinc-carbon batteries (with the text "heavy duty") on them. They have leaked, because they are terrible. Next time, use alkalines. \$\endgroup\$ – Dampmaskin Feb 27 at 13:15
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    \$\begingroup\$ Alkaline batteries are also prone to leaking especially Duracells.I have had a number of good flashlights ruined by alkaline batteries leaking and swelling so they can't be removed. \$\endgroup\$ – Barry Feb 27 at 13:32
  • \$\begingroup\$ True enough. While "heavy duty" batteries will leak, alkalines may also leak. In either case, it's good practice to remove the cells from a device before storing it. \$\endgroup\$ – Dampmaskin Feb 27 at 14:28
  • \$\begingroup\$ Well I used Alkaline batteries. \$\endgroup\$ – danglingpointer Feb 27 at 15:15
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  1. The quality of batteries. Branded batteries can be of bad quality. Be cautious of Panosanic or Sanio batteries;
  2. Damaged batteries, e.g. the parcel full of batteries have fallen to the floor during transportation, and interior and exterior battery structures get damaged, causing the leak shortly;
  3. The position of storage. Note that third battery did not leak, because it is located upside down.

The pic of the batteries would help to diagnose the problem better.

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