Braven’s BRV-PRO is one of the most versatile Bluetooth speakers we’ve ever seen, and that versatility is further bolstered by the speaker’s own ecosystem of accessories. We recently received the BRV-PRO Battery Pack ($50), a 3800 mAh battery that is added onto the top of BRV-PRO to extend the speaker’s battery life from an already strong 15 hours to an almost unheard of 40 hours of playtime “at normal listening levels.”…
