Put a bit of vinegar (it neutralizes the acid) on a cotton swab, mop around, let it dry and then you can use it. Depending on how it was laying, the acid probably leaked onto the board. You can scrape the corrosion off the contacts and put in new batteries. But if it still doesn't work, just chuck it in the fuckit bucket.
Alkaline. 7-10 year shelf life, self discharge at about 2-3% per year. Lead-Acid. 5% per month. Nickel-based. 10-15% over the first 24 hours and then 10-15% every month afterwards. Lithium-ion. 5% over the first 24 hours, then 1-2% per month afterwards. CR123A, AA, AAA, C, D and 9V batteries for sale at low prices, and the best chargers and LED
Removing the battery will take a little extra work. Try using needle-nose pliers to grasp and pull the battery. Twist and tug gently. If that doesn't work, try filling in around the batteries with white vinegar and let it sit for several hours. Then, try twisting and tugging on the batteries until they pop loose.

Step 1: Dissolve the Discharge. Surprisingly, battery corrosion is a base on the pH scale. You can neutralize it using a household acid. Lemon juice or vinegar are both great options. First, put on some protective gloves. Then remove the batteries and set them aside.

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