Dear Sir or Madam, This is Mars from Renerge China. We are an origin manufacturer of rechargeable lithium batteries in Shenzhen, with UL, FC, TUV, PSE, UN38.3 certified. The use of high energy lithium battery would be a good way to achieve your creative electric products. Pls feel free to contact with me if you would like to know more! Have a nice day. Mars Skype: mars@ray-cell.com