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| The generic NB-2LH replacement battery ($20) from my Canon EOS Rebel did not last nearly as long on a charge as the original equipment battery ($60). I went online to find if there were reviews of 3rd party batteries. I couldn't find much. 
What I found was many people use 3rd party batteries with no problems. 
The current "smart" Lithium-ion batteries have an IC circuit inside which allows the camera
 to read the charge level, and compute the number of shots remaining. 
You can save significantly with a generic. The original NB-2LH is 720mAh. You can get replacements with up to 1,900mAh. There are so many types I couldn't find any good reviews. There were lots of comments in the forums like "You spend $X,XXX on other equipment, why skimp on batteries?" 
Several people reported satisfactory results with Watson batteries sold at B&H and Amazon. 
LP-E6 replacement ratings xx (nnn) - xx - Score out of 5, nnn - number of customer reviews
        Amazon                      B&H
Canon LP-E6 1800mAh 4.5 (773) $67 4.8 (2,609) $62
Canon LP-E6N 1865mAh 4.6 (54) $64 4.8 (93)    $62 *
Watson LP-6E 1750mAh 4.2 (17) $35 
Watson LP-E6N 2000mAh         $43 4.5 (69)    $40
Wasabi 2600mAh  4.3 (1,415) 2 + charger for $30 
STK 2600mAh     4.4 (1,011)     $14
BM  2600mAh     4.4 (288) 2 for $28
Vivitar 2000mAH  4.4 (147) 2 for $22
* Note that the LP-E6 and LP-E6N can be used interchangeably, but the LP-E6
 cannot be charged in the E6N charger. The battery differences are due to 
 changed battery design regulations in Japan.TheTechReviewer has had good luck with Wasabi and Watson. Others also recommended Wasabi. 
e-Retailers: 
Charging: 
Airline regulations on lithium batteries: 
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