Review on Rechargeable 12V 3000MAh Lithium Battery Pack: Power Bank For LED Strip, CCTV Camera & More by Steven Thelin

Pros: Excellent battery that works exactly as expected. I am using it to power a small robot, and the 5v USB and 12v DC connection is perfect for powering a raspberry pi along with higher voltage motors.Cons: Very slow charging time. It comes with a 12v, 500mA charging brick (phone chargers are typically 1000mA to 2000mA for comparison), so it takes a long time for this battery to recharge. From completely drained to fully charged takes me about 10 or 11 hours. I believe they said this is so the battery will last longer, but my guess is just because the smaller charger is just less expensive.Despite the slow charging, I will definitely buy this again for my next robot. I feel like it is a great value for what you get.