Running out of battery very frequently even after 3-4 hours of charging is a call for buying a new battery. The 9 cells IBM T61 R61 14 Inches Wide Battery 42T4645 (Black) offers nonstop reliable functioning and performance to utilize time and CPU of your system. No more pending work logs due to power cuts. This product when charged for an hour or so provides a power backup of 4-5 hours. Tested and vali+dated by dexterous dell technicians on all dell systems, this product is for sure a great buy. This product functions properly on almost all the Dell models and is powered by 9 turbocharged cells.