Yuasa high temperature 18670 size NiMH battery, Standard Charge: 0 → 56 °C. Standard discharge: 0 → 70 °C. Charge the batteries prior to use. Dont solder directly to the battery, Napięcie znamionowe = 3.6V, Pojemność = 4000mAh, Chemia = NiMH, Wymiary = 18