Step 3: After that, use a multimeter to check each cell group’s voltage to find the bad cells. If you find a cell lower than 2.5V it is more than likely bad and if you find a cell higher than 4.2 volts, it could be dangerous.
A new laptop battery costs something around 100$, and finding out a new battery turns out to be pricey venture. In the following section, you shall learn how to replace laptop battery in four easy ways. But before that, we shall make a small digression on different types of batteries laptops use for better understanding. Lithium Ion (Li-Ion battery); Nickel-Cadmium (Ni-Cd battery); Nickel-Metal Hydride (NiMH) Li Ion Battery

Used Cars for SaleNew Cars for SaleSell My CarCar ValuatorAbout CarSwitchHow It Works
If you have Magnesium sulfate (commonly known as Epsom salt) with you can easily recondition a car battery. First step is to check the battery voltage and ensure it to be less than 12 V. This shows that it is already dead. Heat about half a liter of distilled water to about 333K-348K (about 30 K below the boiling point of the water) Now, mix about a quarter of Epsom Salt in heated distilled water and stir it until the salt dissolves. For two different types of cells, this step involves different procedures.For flooded cells, you need to remove the battery cell cap.For dry cells, please drill through the sealed cap.For both the cells, pour out the old electrolyte. Insert the new electrolyte into the cell with the help of a funnel. (mainly Epsom salt + water) Next, for a flooded cell, replace the battery cap. For a sealed cell battery, plug the hole in this step. Keep in mind that you have to keep electrolyte properly distributed with no hint of air bubbles inside the cell. Finally, charge it slowly by keeping it on trickle charge overnight and then let it cool. By morning, you have a reformed cell in your hand that performs as good as new!