6x AA Battery Holder with DC Barrel Jack (9V) | Compoden

Use this holder to power Arduino robots and motorised builds from six AA cells (9V total) through a standard 5.5×2.1mm centre-positive barrel plug — plugs straight into an Arduino Uno/Mega barrel jack or an L298N motor supply screw terminal (via a jack adapter). Commonly used for line-follower robots, obstacle-avoidance cars, and any 7–12V VIN-powered build that needs to move without a wall adapter. Not suitable for loads above ~2A sustained or for 3.3V/5V logic rails without a regulator. Key specs: 6×AA in series, 9V nominal output (7.2V with NiMH), 5.5×2.1mm centre-positive barrel plug, ~150mm leads. Alternative: the 8x AA holder for 12V motor systems, or a 2×18650 holder for rechargeable 7.4V.

Product photo: Limor (Adafruit), CC BY 2.0, via Wikimedia Commons.