4-Cell AA Battery Holder (Double-Sided)

Four AA cells wired in series through a holder like this deliver roughly 6V nominal (1.5V per cell), a common voltage for basic microcontroller and small-motor projects that don't need a regulated supply. Rather than soldering wires directly to loose batteries - fragile and genuinely unsafe over time - this holder gives each cell a proper spring-contact terminal and holds all four securely in a molded plastic case with leads already wired in series.

A white plastic housing keeps the design simple and low-cost, and the double-sided contact terminals ensure firm electrical connection at both ends of each cell rather than relying on a single point of contact that could work loose from vibration. As a passive holder rather than a charger or regulator, it's meant for standard (non-rechargeable) or rechargeable AA cells swapped out manually when depleted.

Common uses are simple battery-powered Arduino and microcontroller projects needing a basic unregulated 6V supply, portable electronics prototypes, and educational STEM kits needing an accessible, swappable battery power source.