NiMH batteries have long been a popular choice for airsoft guns due to their affordability. These versatile batteries can be configured in various styles, including small (mini brick), large, nunchuck (butterfly), stick, and crane stock/tri-panel. With voltage options ranging from 8.4V to 9.6V (and even 10.8V), NiMH batteries offer a reliable and cost-effective power solution for airsoft enthusiasts.