I would like to buy a Nekteck 21 watt portable solar panel array mainly to charge AA batteries. I've heard many times how it's better to connect the solar panels to a battery bank, and then to a device such as a phone to charge that device. However, if I'm simply charging AA batteries, doesn't it make more sense to just connect the panels to the battery charger? IOW, would connecting solar to a AA battery charger run the same risks associated with connecting solar directly to a smartphone? Here are the solar panels and charger I'd like to get: https://www.amazon.com/gp/product/B017GQ7OEA/?tag=survivalmonke-20 https://www.amazon.com/gp/product/B07TGT9D98/?tag=survivalmonke-20 Also, I have looked at dedicated chargers for charging AA and other conventional batteries. They almost all got bad reviews. Plus, the batteries would get really hot inside those chargers since they're within the same unit as the solar panel absorbing the sun's heat. I'd like to avoid that by having the battery charger separate from the panels.