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Power Banks and Android Upgrades

I see on Lazada.com.th(an online shopping site for Thailand) a list of power banks:P 30,000mAh, 40,000mAh and 50,000mAh for from $6, $9 and $12! I'm will to buy the 50,000 PB, so how can I tell if I'm wasting my money or getting an unbelievable value? Lazada is a good value web site, BTW.
Also, how can I upgrade my Android 4.2 OS?
 
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