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Hi Micah. The capacity of these Lithium battery banks is commonly overrated, sometimes by a large margin. If it's truely 14Ah then it's a good deal, but there's definitely risk with this buy. The other quality consideration is that of the in-built charging circuit. Li-ion / Li-poly batteries are highly temperamental and can be ruined by inadequate charging regimes. In this case, you wouldn't know until it was too late. Sorry, this doesn't paint a rosy picture. At the end of the day it's only $130 and eBay is pretty good for returns.
As an alternative, you could look at Lithium batteries for motor cycles. I just did a quick search and found heaps available in Australia for around the same $. I suggest these over the backup charger packs because they're much more likely to be good quality (because of the high current drain required to start an engine). You would need a charger too, but all up you would be pretty certain of getting better bang for your buck.
Or if you're not afraid of a little DIY you could do what I did - make a high quality pack with batteries and a charger from a hobby supplier. As with motor vehicles, remote control gear needs to be high quality because of the massive amperage and physical demands that are placed on it. I've dealt with Hobbyking.com quite a bit for batteries. It's a pity that they don't make any 'off the shelf' 12v platforms.
Cheers,
Dane
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