24v battery to 12vdc for stereo possible?

i want to use a 24v Kobalt battery 2.0ah lithium-ion for a 12vdc stereo. i found a battery holder for this now im wondering how possible this is and what ill need, i assume a step down unless i can find a 24v stereo. this will be like a dewalt work radio w/o a charger. If your wondering no Kobalt 24v line does not have a stereo and i like to use the same battery's(also the price and reliability vs dewalts 20v wins) the main battery i intend to use will be a 24v lithium-ion 2.0ah but possibly also a 1.5ah. along with a car stereo(probably pioneer preference) and a pair of 100w speakers all in a med sized box. i would settle for using a cheap brand stereo if need be thanks for any help

 

thank you, the one i was planning on using was 10a max but i found another that was 12v 5a max speakers will only be 30w x 2 but if i can make it work...also just looked up some specs. the battery is 24v but at peak, normal run is 21