Is this a good extended battery?

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Hey guys, I've been looking at extended batteries for the myTouch 3g, and I just found one on ebay. Does it seem like a good and reliable one? It says it is 3.7V Li-ion 2100mAH, but to tell you the truth, I don't really know what that means. It also comes with a cover. Will it add a ton of thickness to my phone, and do you know if the case around my myTouch will still fit?

Link

Thanks.

Regarding your battery

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Hello!

Here's my opinion on your battery.
The original battery inside your phone now is 1340mAh (milliamp hours).
The one you're looking at is 2100mAh, which for you would be a 56.71% increase in battery life.

The upside:
Ridiculous battery life

The downside:
1970's soviet era technology backing for your phone (it's terrible looking).
No accessories skins/acrylics would really accommodate your phone. You'd have to rely on a universal-type side holster.
The battery is off-brand and ships from China, the quality of these cells are unknown, and who knows how old.
Perhaps try reputable battery brands such as "Seidio" or "Mugen"

I recently purchased a Seidio 1500mAh slim profile battery, which gives me an 11.94% increase in power, whilst allowing me to keep my current backing on with NO increase in device thickness.

Couple this with some operating system tweaks and or a new rom specifically made for battery improvements and you should really enjoy from then on in.

Good Luck!