10 - English Setup Connecting to AC power Before using your Bose Â® SoundLink Â® Mini speaker the first time, connect it to AC (mains) power and charge the battery. You can connect the power supply cord into the charging cradle, or directly into the speaker. While the battery is charging, you can begin using the speaker.
Ann is completely right. Given the alternative energy aspect of solar lights it seems a bit funny to have them charged by electrical lighting. Given enough direct and reflected sunlight in a room, they could be charged indoors. The stored charge wouldn't be as efficient as if they were in full sunlight though.
1 However, sooner or later the sun will shine again and then the solar battery charger will be able to successfully do its job.  A solar battery charger will not recharge batteries as quickly as a standard 120-volt house current battery charger. However, if the electricity if off, and your batteries are completely drained, then you may not object to waiting a little longer to recharge your radio and flashlight batteries.