Hi Tony,
The IT guys in my office turned me on to a very good laptop replacement battery called Max Capacity which is what I think you are looking for. My office has been using them for our work laptops and they pack more power and last longer than the Dell/HP/Lenovo factory batteries and do it at a better price. They use some advanced li-ion cells from Panasonic that store about 30% more power and have a longer service life than most replacement batteries. The extra power is perfect for me while the longer service life helps the IT from having to deal with battery orders all the time
The amount of power stored in a laptop battery should be printed somewhere on the battery pack and stated in terms of mAh (milli amp hours) and Wh (Watt hours). Basically the higher the numbers means then more power a battery can store and the longer it can power your notebook / laptop. As for the service life (how long the battery will last) that depends on the quality of cells inside the battery.
Example:
- A typical 6 cell Amazon/Ebay battery rates at 4000-4400mAh/ 47Wh and uses cheaper generic cells will typically power an average laptop for about 1-2 hours and will need to be replaced after about 300 charging cycles or only 1 year worth of use.
- A Typical 6 cell factory Dell or HP battery rates 4400mAh-5200mAh 47Wh-55Wh and uses brand name cells made by Samsung/Sanyo/LG. These batteries will typically power an average laptop for about 2 - 3 hours and will need to be replaced after 500 charging cycles or 2 year worth of use.
- The 6 cell MaxCapacity.co battery which I stated rates at 6200mAh/66Wh and uses these special Panasonic cells which last about 700-800 charging cycles (3 years). The run time I get is about 3-4 hours which is about 1 hour more than the brand name Dell I had. I wound up getting a 9 cell 99Wh battery for when I travel and get about 6 hrs of run time on balanced power mode and almost 9 hrs it I run in “extended Battery” mode
If you wanted to see some examples of these good batteries, here is where my IT gets them from ...
http/SafeBatteries.com
The average cost seems to be between $70-$80 which I think is good considering the extra power and 3 years of service life you get.
Cheers,
Allen