![]() ![]() ![]() Eventually it comes up to 12.9+4 = ~ 16-17V. The external power supply must provide this headroom, which includes minimum of "drop-out" (or regulation) voltage for switching electronics inside the external power supply and internal charger, 1-2 V per device, give or take. So, for 3-cell, it comes up to 12.6 - 12.9 V of input. So the feeding power must have some overhead to provide the charging process (or let internal charger to do so). ![]() The value of "10.8" indicates that this is a battery of 3 Li-Ion cells in series, giving their standard "nameplate" voltage of 3.6V per cell.Ĭharging the Li-Ion cells requires variable voltage levels, from 2.5-3 V per cell (when in deeply discharged state) to 4.2V (4.35 in some cases) per cell in "constant-voltage" stage of charging process (otherwise the cell won't be charged to full capacity). We will be more than happy to assist you.The voltage on your battery "10.8V" is the "nameplate" voltage, some average voltage that your battery delivers over full discharge cycle. If you are not sure about compatibility, please read our Buyers Guide or provide us with the laptop model number or part number of your original laptop battery. Laptop manufacturers use different types of batteries for the different model of laptop. It is a perfect replacement battery, and on the top price is also very competitive. There is no need to worry about the reliability of the product as the replacement Lenovo ThinkPad X240 X240S 4400mAh 6 Cell laptop battery we ship go through proper quality assurance processes. The new Lenovo ThinkPad X240 X240S 4400mAh 6 Cell laptop battery will meet all the specifications so you can experience a consistent performance out of your laptop. You can expect optimum level of performance just like you were experiencing with your original laptop battery. This is finest quality laptop battery available in the market it will replace your faulty (original) laptop battery. We will send high quality Lenovo ThinkPad X240 X240S 4400mAh 6 Cell laptop battery compatible with listed model. Lenovo ThinkPad X240 X240S 4400mAh 6 Cell Laptop Battery ![]()
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