Re-Calibrate Your Old Laptop BatteryIt is difficult to predict how long a laptop battery charge will last because each computer user has different habits and needs. But if you begin to notice that your Dell inspiron battery is not lasting as long as it used to, then you may be able to improve its performance by re-calibrating it. Most computer companies like Apple and Dell recommend that laptop users calibrate their batteries every couple of months in order to keep them functioning properly. Laptop batteries will run out quicker as they get older, but re-calibrating can improve battery health.
First connect your laptop's power adapter to the computer. Plug the other end into a standard electrical outlet. Charge your Dell inspiron battery until the screen indicator says that it is fully charged. Allow it to run all the way down until the computer shuts off automatically. Do not plug your laptop into the power adapter even if you receive a low battery warning. Once the laptop battery has fully drained, plug your laptop back into the power adapter and leave it connected until the battery is fully charged again.
Re-calibrate your battery every month or so by fully charging, fully discharging, and then fully charging again. Basically to have a chance to re-calibrate your laptop battery is to turn off all power-saving features completely and then fully recharge them. If it doesn't work for the first time then try two more full discharges and recharges.
The above way of re-calibrating the Dell laptop batteries works well with laptops using Ni-MH cells. But not with laptops using Li-Ion batteries because deep discharges will actually decrease the charge capacity and lifespan of Li-Ion cells. Moreover Li-ion batteries irreversibly lose approximately 20% capacity per year from the time of manufacture at a typical 100% charge level at 25deg.C, even when unused. That is every deep discharge cycle decreases the capacity of the Li-ion batteries. As the Li-Ion batteries are chemical in nature, charging and recharging is not going to fix the problem once the chemical reactions stop happening. Therefore the best advice for re-calibrating the Li-Ion batteries is to store the battery at 40% charge if it kept unused for any unlimited period of time. Also don't leave your battery in the laptop if you don't use the battery or if you plug the laptop into outlet power.