1.5V Alkaline Button Cell Battery, We can also do the battery pack as your request. Pls supply us the drawing, or tell us your detail request, our engineers can do fully as it. Below is our LR41 datasheet for your reference, we have industrial bulk packing in tray, and 10pcs/blister card packing, any ones you need, welcome to ask us, we can supply you the best product and service, thanks.