How to choose laptop battery replacement?

There is no laptop without a battery. This what makes our laptop a completely mobile device is not its size or weight, but the battery.

All batteries have a limited lifespan. The batteries most commonly used in laptops are based on lithium-ion tecnology and the duration of their life is approximately 500 cycles (2-3 years). Cells are subjected to a natural aging process, which means that their efficiency and capacity diminish over time. Eventually the duration of the battery usage in one session becomes very low and at the end it is impossibile to use our laptop without connecting the power supply. In this way the laptop is no longer showing the characteristics of mobility which we wanted in the first place. The first and the most important step to restore the original functionality of the laptop is to choose the right battery.

What to look for when choosing a battery for your laptop?

On the contrary to the widespread opinion among many computer users, to select the appropriate battery is not enough to know the brand or the model of our laptop. The most important parameters are original designation, voltage and capacity.

1. Where to look for battery models and how does they look like?

The battery designation is always located on the battery itself. To identify it, remove the battery from the computer and check the label. In addition to other information, such as country of the production and warning signs, there is a unique battery code. Depending on the manufacturer and the computer, the battery code takes form of various configurations of letters and numbers. The following are the most popular patterns of signs.

  • for Apple: AXXXX – for example: A1185;
  • for Acer: ASXXXXX – for example: AS07A31;
  • for Asus: AXX- (for example: A32-M50);
  • for Dell: a sequence of letters and numbers depending on the computer generation (for example: GW240 or J1KND);
  • for Fujitsu-Siemens - Battery Pack code - 3S4400-S1S3;
  • for brands HP / Compaq:
    a) HSTNN-XXXX (for example: HSTNN-UB72);
    b) 9 numbers of which the last three are preceded by a hyphen – for example: 485041-001;
  • for Lenovo / IBM, FRU and ATM numbers - for example: 42T4504;
  • for MSI: BTY-XXX – for example: BTY-L74;
  • for Samsung AA-XXXXXX – for example: AA-PB9NC6B;
  • for Sony: code VGP-BPSXX – for example: VGP-BPS13;
  • for Toshiba: characters PAXXXX (for example: PA3534-1BRS).

II. Battery voltage

Finding the battery code is still not enough to select an appropriate accumulator. The second parameter to which we should pay attention while choosing a battery is its voltage. Depending on the energy requirements of the computer, the battery voltage is 10.8V (or 11.1V - also compatible) and 14.4V (or 14.8V – also compatible). The voltage is closely related to the amount of cells in the battery - usually a battery with voltage of 10.8V has 6 cells and a battery with voltage of 14.4V has 8 cells.

Another important step is to check the battery voltage parameter. Although the dominant voltage value in laptop batteries is 10.8V, sometimes the industry produces batteries with higher voltage. Furthermore, the matter is complicated by the fact that one battery model (for example a popular battery AS07B31) can exist in two versions of voltage, lower and higher. The batteries of different voltage cannot be used interchangeably - battery with a lower voltage in a computer that requires an accumulator with different parameters will not work.
The voltage can be checked as easily as its designation – it is located on the label, often near the battery model name and its international sign is V (voltage).

III. Battery capacity

The third important parameter, is the capacity which is usally marked by two units: mAh or Wh (miliampero-hours or watt-hours). Strictly speaking, the mAh is a proper measurement of the capacity of the cells. Moreover, 1Ah means that the device is able to continuously supply a current of 1A for an hour. On the contrary, the value Wh specifies for how long the battery will be able to function during a single use (if we know the energy requirements of our laptop in watts, for example: the requirement of 20 watts when the battery parameter is 48 Wh means that it will provide the power to the computer for about 2.5 hours). The principle is simple - the higher mAh / Wh are, the longer operating time we will be able to get.

Batteries with higher capacity

The most common original battery capacity is 4400 mAh (48 Wh), which is usually obtained from 6 cells (at voltage of 10.8V). This capacity doesn't always allow to achieve the satisfactory operating times. For more demanding users we offer batteries with higher capacities that are obtained by adding another set of cells that increases their capacity - for 9 cells, the capacity will be 6600 mAh (at voltage of 10.8V), for 12 cells, the capacity will increase to 8800 mAh (at voltage of 10.8V). The usage of batteries with higher capacity means longer working times (compared to the standard capacity of 4400 mAh) and more than 1,5 times (in case of batteries with capacity of 6600 mAh) and up to 2 times (if using a battery with capacity of 8800 mAh).

Keep in mind that higher number of cells in the battery also means larger dimensions. Such batteries are generally extended in two ways: in the back or on the bottom. The solution to extend the battery on the bottom has many followers among the users of laptops, as it lifts the computer for about 2 cm which allows better air circulation underneath and reduces the operating temperature of the laptop. This is one of the main reasons for using laptop replacement batteries - original batteries are not available with higher capacity.

Another way to get higher capacity is to use batteries with non-standard cells. This solution we used in our batteries ULTRA. Through the usage of Panasonic cells we achieved a capacity of 6800 mAh without extending the battery physically, their size is just the same as the size of the original battery.


Applying the above tips into practice will help you to avoid the consequences of selecting a wrong battery as return shipping, exchanges and extra related costs. If you still have doubts, we encourage you to contact our customer service offering help via chat, telephone and e-mail. You can also buy new laptop batteries in our online shop.