I'm Rachel, i work for joysuny in zhuhai China .we have very professinal R and D team.We can provide one-stop solutions for batteries, Let me briefly introduce:Zhuhai Jiasheng New Energy Technology Co., Ltd., located in the high-tech district of Zhuhai City, is a sino-foreign joint venture invested by Australia's Phoenix Technology Group. It is currently one of the leading manufacturers with the most comprehensive range of lead-to-lithium batteries in the world. Our ranges offer features such as but not limited to: multi-level current time-based overcurrent protection, self-recovery of ultra-low voltage collapse, short-circuit self-recovery, synchronous leapfrog equalization of multiple strings of cells, parallel function of battery packs, virtual substitute for single-circuit cell disconnection, virtual short-circuit protection, etc. www.joysuny.com.