i cannot agree on this:
"1.唔好買太cheap既野,D不明來歷既電好多時都作大C數,放電超出額定C數係變肥仔 ...
I meant you may over-estimate the "C" value. E.g., you run on a 3.5R and you know you need a 60C battery. You buy a cheap one labelled with 60C but actually it was assembled from 40C cells. So, you will drain a 40C battery like draining a 60C one. Your battery may become fat-boy.