Rechargeable Li-on Battery 3.6V, 3000mAh for RK25/RS35 UHF RFID Reader
https://www.eutronix-safety.eu/shop/kbrk250x00504-rechargeable-li-on-battery-3-6v-3000mah-for-rk25-rs35-uhf-rfid-reader-25791
https://www.eutronix-safety.eu/web/image/product.template/25791/image_1920?unique=95530b6
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Internal Reference: KBRK250X00504