Battery Packs for IoT. Voltaic solar panels and power banks are designed to be plug and play. If you need a battery with an efficient solar charge circuit, our V15 (4,000mAh), V50 (12,800mAh), V75 (19,200mAh). V70 IoT (19,200mAh) and V88 (24,000mAh) have been designed with IoT applications in mind. Besides charging efficiently from solar, these batteries have a Always On function that a) keeps