AA Portable Power Corp. (dba: Batteryspace.com) was found by several previous BYD USA team members in 2000 and became a joint venture of several battery and charger manufacturers over years. We specialized in all kinds of rechargeable batteries and chargers, including Nimh batteries, Nicd batteries, Lead Acid batteries, Li-ion batteries, Polymer batteries, LiMnO batteries, LiFePO4 batteries, PCB/PCM/BMS and related battery chargers. We have a 20,000 Sq.Ft. warehouse and two battery assembling lines in Richmond California. We also have office, warehouse and production lines in Shenzhen, China. We have customers from all over the world, USA, Canada, Europe, Australia, New Zealand, India etc. At AA Portable Power, we are not only sell batteries and chargers, but also provide expertise to help customer design their own custom batteries. We also stock inventory for customers who place schedule order. Our sales and engineers have more than 10 years of experience, if you have any new design or inquiry, please just give us a call at 510-525-4710 or email us sales@aaportablepower.com. Our engineers will work with you to provide you the best solutions. In 2014, we set up our own UN38.3 Safety Testing Lab and can provide UN38.3 test service to our customers now.