AA batteries are actually a blessing in a device like this. You can use NiMH rechargeables, which cost next to nothing. With a few spares, you can play for days without having to find a charger. When you do have to charge, you can have one set in the device, while charging the spares.
I'm actually really annoyed by the fact that everything it the world has it's own, proprietary, $30 lithium-ion battery. Sure, Lithium does get you more power in a smaller size, but there are a lot of devices that could benefit from using AAs instead. Especially when, as is often the case, the only way to charge the proprietary battery is in the device itself.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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AA batteries are actually a blessing in a device like this. You can use NiMH rechargeables, which cost next to nothing. With a few spares, you can play for days without having to find a charger. When you do have to charge, you can have one set in the device, while charging the spares.
I'm actually really annoyed by the fact that everything it the world has it's own, proprietary, $30 lithium-ion battery. Sure, Lithium does get you more power in a smaller size, but there are a lot of devices that could benefit from using AAs instead. Especially when, as is often the case, the only way to charge the proprietary battery is in the device itself.