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The Macintoshes Classic marked the decline and eventual end of the compact Macs. It was sold from 1990 to 1992 as the low end of the Mac lineup. It ran on an 8 MHz Motorola 68000 processor, which was remarkably slower than its contemporaries, but kept its appeal as the first Mac less than $1000.
Age: Old batteries tend to go bad. The ones in the Mac Classic like to also leak and corode the motherboard, sometimes beyond repair.
Solutions
First remove the battery (or what's left of it). Then try to neutralise the acid with something like soda. Clean the Board as good as you can. You might be lucky and get away with minor repairs like replacing a few components. There's a big possibility though that traces are damaged. In that case try to rewire them as good as you can with some external thin wires.
Leaky Capacitors
Cause
Also age: Capacitors go bad just like batteries. Eventually they will leak all over your board. Try to clean the board as good as you can from the electrolyte. Then remove the capacitors one by one and clean again (A toothbrush and some isopropyl alkohol are pretty useful. For me, water and soap work better but hard water can leave behind awful stains which may also be conductive). Replace the damaged components that may be around and capacitors. All you have to do now is test it.
