Unused battery, is there hope for revival after 3 years?

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Mapog

Race Dog
Joined
Jan 7, 2012
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Suzuki DR650
I purchased a product were a battery stood for 4 years, but the positive was disconnected.

I see some battery chargers claim they can revive dead batteries?
My question is wheter its possible?
Or should I just consider it dead?
 
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