Will this charger work with my MacBook?

Ok my macbook broke. It wont charge the battery anymore. It'll run fine off when I have the AC plugged in but it wont charge my computer. I asked some people and they said it was most likely the logic board. The thing is I had this problem back when I hadwarrantybut the person (apple store. Mac Genius) only replaced the battery connector. Now that I'm out of warrenty my macbook stopped charging my battery again.

So I if I take it in to the apple store and it is the logic board it'll cost me. But if they say its the battery connector it'll cost . But if the person makes the mistake again and it was the logic board and it breaks again well thats 0.

So I was looking at some alternatives. Well I came across this external battery charger. Well I bring my laptop to school so I could just charge my laptop over night using the external charger. So it'll only be ainconvenienceof having to take the battery out alot if I want to charge it. thing is when there is no school I wont have to charge it alot (like right now over summer because I'm at home next to a outlet)

So has anyone tried this thing before and do you know if it will mess up your battery or not? Also how durable is this thing? It is a smart charger right?

'http://www.amazon.com/External-Battery-Charger-PowerBook-Standalone/dp/B001LWUHY0/ref=sr_1_4?ie=UTF8&s=electronics&qid=1244860417&sr=8-4'

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