There’s no need to worry about batteries with this particular unit for the reason that the XROS three Nano includes a built-in 1000mAh battery that recharges in only 50 minutes with a kind-C cable.
The Ursa Nano https://vapebarsstore.com/product/happi-x-esco-bars-2-gram-d10-disposable-pink-rozay-pastel-cartel-for-sale/