Carrying a second battery on the Pace 500

I was thinking of securing I to my planet eco bike rack that I purchased from Aventon, but not sure how much weight it will carry, any ida?
 
Do you think that I could carry the battery in a pannier?
You can carry a battery in a pannier as long as they are compatible size, as battery sizes and panniers can vary a lot. The think to look out for is that batteries are quite heavy and if you are on trails and they bounce around a bit it can really put a strain on the bag, so make sure it is a well constructed one.
 
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