yes English is not my main language :) the question is exactly this :
"Do those uses accumulate, letting you potentially have 9 Smites available at once? Yes, I don't see anything that says otherwise " (for me you are right)
But
he says that for this rule:
"Stacking
Stacking refers to the act of adding together bonuses or penalties that apply to one particular check or statistic. Generally speaking, most bonuses of the same type do not stack. Instead, only the highest bonus applies. Most penalties do stack, meaning that their values are added together. Penalties and bonuses generally stack with one another, meaning that the penalties might negate or exceed part or all of the bonuses, and vice versa."
this bracelet only adds one smite at a time and until i use this extra smite i can't have more (from this source)because they don't stack
in the answer you could argue with some official rule if there are any about it thank you again