None of us want to spend more $$$ than necessary, and certainly not for something as ordinary as a battery. However, there may be reasons to go with the OEM Canon battery.
I recently took apart an older (5 years) BP-511 that no longer holds a charge. There is a lot besides batteries in that pack, like fuses and electronics.
***The Canon battery has a lot of protection devices, does the aftermarket battery have them as well?***
I looked at the referenced article on batteries and found a number of holes in it:
>Another important thing you should know is that mah stands for milliamp hours. The larger this is the longer it will last in your Camera.
*Not exactly. Milliamp hour ratings mean little without knowing how they were measured. There is no standard, I can test a Canon battery and come up with ratings from 100 to 2000 mAH. Most of the battery sellers buy their cells from one of only a few sources, and there is little difference in cell capacity.
>when the battery is fully charged it will show well over 8v..and when it is drained it shows around 7.4. I would personally never allow a single cell lithium battery to get below 7.4v.
*A single lithium cell has a nominal rating of 3.7V, not 7.4V. All of our batteries are two cells in series to produce a nominal 7.4V. Open circuit voltage does not mean much anyway, it is the voltage under load (as when it is being used in a camera) that tells how much charge is left in a battery.
To conclude, Canon does not have a lock on battery quality, anyone else can make a high quality battery pack with excellent protection. The question is, who does? Advertisements and endorsements don't mean much unless someone has taken the pack apart and checked to be sure all the protection devices are present.
I may be extra picky about all this but the videos of batteries bursting into flames are pretty impressive, not as good as "Wishes" but not bad!
