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Flexible Lithium Polymer Battery Safety Guide

From:CTECHI GROUP Limited     Release time:2018-09-25

Overview:Flexible lithium polymer battery, Flexible LiPo batteries, have very specific charging requirements and MUST only be changed by the chargers which are designed to charge lithium polymer batteries. Incorrect using of these batteries can lead to fire or explosions.

Flexible lithium polymer battery, Flexible LiPo batteries, have very specific charging requirements and MUST only be changed by the chargers which are designed to charge lithium polymer batteries. Incorrect using of these batteries can lead to fire or explosions.

Flexible lithium polymer battery or LiPo batteries are a great new way to store energy for portable devices from cell phones, home electronics to RC hobby flexible lipo battery pack used in electrical vehicles. They're great because they can store about 350% more energy than a typical NiCd/NiHm battery pack and weigh 10% - 20% less. They can also discharge much more current than a NiCd/NiHm battery and can be fully charged in about an hour. LiPo batteries also don't develop memory or voltage depression characteristics like NiCd/NiHm batteries, and do not need to be discharged before being charged.

Flexible Lithium Polymer Battery

But they're also have shortcomings. Mishandling of these batteries can lead to fire, explosions and toxic gas. In the rest of this guide we will cover safety guidelines of charging and handling flexible lipo battery pack. Some may seem pretty obvious, but it is often the obvious things that are the most dangerous when ignored.

We recommend that lipo cells MUST only be changed by the chargers which are designed to charge lithium polymer batteries. For example, ultrathin rechargeable polymer lithium batteries have the specific charger designed for their own features.

"1S" or 1 cell LiPo battery has a nominal voltage of 3.7v. When fully charged it has a maximum voltage of 4.2v and when fully discharged, it should never be below 3.0v without risking cell damage. Based on this logic "5S4P" battery pack means that the pack contains 5 cells in a series circuit and 4 cells in a parallel circuit. Since each cell is 3.7v (nominal) a 5S LiPo battery has a nominal voltage of 18.5v, a fully charged voltage of 21.0v and a maximum discharged voltage of 15.0v before damage occurs.

When charging flexible lithium polymer battery or flexible lipo battery pack, they must be charged at the voltage of the number of cells in series, therefore a 5S4P pack must be charged as a 5 cell pack.

The LiPo charger you're using must be able to handle the cell count of the battery you are charging. A good smart chargers will automatically detect the cell count of the battery being charged while the cheaper ones will require a manual setting.

Chargers that automatically detect the cell count of a LiPo battery can sometimes make a mistake. They use the current voltage of the battery to determine the cell count and if the battery is fully charged or at a lower voltage than it should be, it may read the cell count incorrectly. This is why it is very important to recheck that it reads the right cell count which is typically displayed on the LCD display.

Doing some research and investing in a good quality Lipo charger from the outset will not only save you budget in the long run and give you more enjoyment of whatever you are operating, but will also ensure your safety!


At CTECHi, We provide various quality batteries, including ultrathin rechargeable polymer lithium batteries. If you have any request, please feel free to contact us.


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