How good are 3 party chargers

Hi i bring my macbook to school with me and would like to have a extra charger with me. i have one laying around i don't use i but will it be oaky if i were to use that with my macbook

The problem is that Apple has not licensed anyone to make "official" chargers.  Chargers from the laptop manufacturer are typically expensive.  What that ends up creating is an easy opportunity for someone to slap something together and sell it for a fraction of the price.  The problem is that there can be little to no quality control where these things are made.  They may work fine, they may not work at all, or they may fry your Mac.  So, when you say "cheap", I guess you have to consider the potential cost of having to replace your Mac (or at least a costly repair).  There is also the potential for fires, etc.  Batteries and chargers are typically two things that I get only from the manufacturer. There's nothing to say that it might not work fine for you.  You just have no guarantee of that.  At the very least, you would want something U.L. listed (which the one you have linked to does not appear to be).

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