~~ I am also not stranger to having trouble establishing a dialouge, getting answers to my questions and getting spec sheets with pacific rim manufactured solar equipment and batteries. It helps if the equipment can be purchased from a reputable provider who has an established location on the North American continent with technically savvy salespeople who can find answers to your technical questions. For what its worth, im pretty sure that Topband knows their stuff and knows how to build their products and they have been around about twenty years. The following link contains some different ways to communicate with them, (including live chat), not sure if they have good translators on staff give it a try? Good luck, be patient, have your model and serial numbers and purchase information available and keep your language and questions simple.
China Quality Rechargeable Lifepo4 Battery and 48v Lifepo4 Battery suppliers Beijing XD Battery Technology Co., Ltd., We are committed to providing high quality products, Which have been sold worldwide at low prices.
www.rechargeablelifepo4battery.com