Double A battery, which is basically an extra battery, is an energy storage device that you can buy and use to power your device.
It’s the same kind of battery used in solar panels.
A double A battery costs $70 and can last up to three years.
You can also buy a battery with a built-in charger.
A solar battery is an expensive piece of technology.
According to Bloomberg, solar panels are estimated to cost about $1,100 per kilowatt hour.
A typical solar panel can produce enough energy to power about 5,500 homes, but they need a lot of electricity.
If a battery costs that much, then the system can be expensive.
This article is from the archive of our partner The Wire.