The battery housing is very traditional, 2 recesses with spring and contact plate to hold the batteries. This design has been used for a long time. Some products use pop-out scheme to access the battery, but this works best for a single battery or for batteries that are placed top-to-bottom. This scheme won't work here with this headphone. Furthermore, pop-out battery's housing design tend to have problema with battery contact because of the battery's pressure exerting on the plastic cover. In some case, the battery will pop out by itself, especially when the object is hit or dropped.
Other alternative is to use built-in rechargeble battery. This will take care of frequent battery replacement but also called for frequent recharging. Furthermore, rechargeble battery of this kind tend to be heavier, thus the headphone would be a bit heavier. I have a wireless bluetooth headphone of this type. It has to be recharged after about 3 or 4 hours of continue use. Battery's life should now increase in newer models. Last but not least, if you use the headphone while tracking through the wilderness without an easy way to recharge it, you are out of luck.
The solution to this problem is to redesign the battery cover so it can be more easily opened without sacrifcing its purpose or its overall aesthetics. You guy in product design, get to work.
