You shouldn't need to worry about that. The 20% SoC check recommended by @ScruffR above will keep you out of odd situations with cell connectivity and complete data transmissions but I think bricking is a very low probability event if you use their battery. I've asked questions along similar lines and think you may find another useful nugget or two in some of the responses, like this one: Smallest viable battery for E-Series (LTE M1 or 3G) - #11 by BDub.