Each piece of Laptop lithium battery composed by PCP board (base plate), PCM plate (protective device). On the lithium battery we have applied four way to protect your PC entirely:  1. overcharge protection;2. over-discharge protection;3. overcurrent protection;4. temperature protection  and During the production process,  there are three times  quality inspection barried before delivery to ensure excellent quality. Products have received a number of international quality certification such as CE, UL and EMC certification, the product is in line with our standards of 3C....  Our products are new and Durable.... Battery Type: Lithium-ion Volts: 10.8v Capacity: 4400mAh & 8800 mAh Description: Rechargeable Laptop Replacement Battery for IBM/LENOVO Series laptop computer. This battery can replace the following part numbers:Lenovo 41U3196,41U3197,41U3198,42T5225,42T5227,42T5229,42t5230,42T5262,42t5263,FRU 42T5262,FRU 42T5264,ASM 42T5265,43R2499,42T4530,42T4531,FRU 42T4532,ASM 42T4533,FRU 42T4548,FRU 42T4645 Compatable for laptop:Lenovo T61,T61p,t61i,T61u,T61w,R61,R61i,T400,R400 Series Laptop Battery ThinkPad R61  7732     ThinkPad R61  7733     ThinkPad R61  7734    ThinkPad R61  7735 ThinkPad R61  7736     ThinkPad R61  7737     ThinkPad R61  7738    ThinkPad R61  7742 ThinkPad R61  7743     ThinkPad R61  7744     ThinkPad R61  7751    ThinkPad R61  7753 ThinkPad R61  7754     ThinkPad R61  7755     ThinkPad R61  Series (14.1”widescreen) ThinkPad R61i 7732     ThinkPad R61i 7742     ThinkPad R61i Series (14.1”widescreen) ThinkPad T61  1959     ThinkPad T61 6377      ThinkPad T61  6378     ThinkPad T61  6379 ThinkPad T61  6480     ThinkPad T61 6481      ThinkPad T61  7658     ThinkPad T61  7659 ThinkPad T61  7660     ThinkPad T61 7661      ThinkPad T61  7662     ThinkPad T61  7663 ThinkPad T61  7664     ThinkPad T61 7665      ThinkPad T61w 7663     ThinkPad T61i 7732 ThinkPad T61w Series (14.1”widescreen)       ThinkPad T61p Series (14.1”widescreen) ThinkPad T61u Series (14.1”widescreen)      ThinkPad T400 2764     ThinkPad T400 2765     ThinkPad T400 6473    ThinkPad T400 7417 ThinkPad T400 Series   ThinkPad R400 7443     Thinkpad R400 Series