> This was posted here earlier this month, and while it's a cool invention and worthwhile endeavor, it must be noted that this is battery-free because it's powered by sound. The reporting is kind of disingenuous because only the transmission back to the surface is energy-efficient.
And it's also disingenuous because the battery is literally described in the article as well:
> Those sound waves could come from any source, like a passing ship or marine life. The camera stores harvested energy until it has built up enough to power the electronics that take photos and communicate data.
I guess what they meant to say is that it doesn't require manually recharging of the battery it has, or that it can recharge itself underwater.
Storing energy is quite literally what a battery is, and it has a device that does just that.
And it's also disingenuous because the battery is literally described in the article as well:
> Those sound waves could come from any source, like a passing ship or marine life. The camera stores harvested energy until it has built up enough to power the electronics that take photos and communicate data.
I guess what they meant to say is that it doesn't require manually recharging of the battery it has, or that it can recharge itself underwater.
Storing energy is quite literally what a battery is, and it has a device that does just that.