Some notebook computers are designed with a dedicated battery for backing up RAM functions when the machine is temporarily shut off. These type of batteries are alternately known as bridge batteries, RAM batteries, or resume batteries. Most RAM batteries are rechargeable NiCad and will last around 2-3 years. It is recommended that you replace your notebook's RAM battery when replacing the CMOS battery. That is difficult to determine.
Actual battery running time depends upon the power demands made by the equipment.
The use of the monitor, the hard drive and other accessories results in an additional drain upon the battery, effectively reducing its running time. The total running time of the battery is also dependent upon the design of the equipment. The difference between them stems from the fact that each type requires a different charging pattern to be properly recharged. Therefore, the portable device's charger must be properly configured to handle a given type of rechargeable battery. Refer to your owner's manual to find out which rechargeable battery types your particular device supports, or simply use our search engine to find your device.