The 8-cell ThinkPad battery 78++ is a replacement/spare battery for P70 system. The battery is rechargeable and can be used as replacement or as a convenient spare for mobile workstation ThinkPad P70 system. This battery is powered by Lithium-Ion technology and has a safeguard chip which authenticates with Lenovo systems. The battery lasts on average 96 watt hours and utilises over-discharge protection to ensure a secure flow of power.*Many factors affect battery life. These include: screen brightness, battery conditioning, features, applications, power management and other customer preferences.