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Lipo Safety: A Safety Guide for Using Lithium Polymer Battery Chargers

Lipo Safety: A Safety Guide for Using Lithium Polymer Battery Chargers

When it comes to lithium cell technology, the lithium polymer (LiPo or Li-poly) and the lithium ion (Li-ion) are significantly different from the commonly-used NiMH and NiCd batteries. There are various aspects to consider before you use lithium cells.

One of the most being safety. While every type of cell should be treated with caution due to energy contained in the batteries, once they are fully charged it is important to know that lithium cells contain the maximum in energy density. These batteries have unique qualities and require extremely specialized safety considerations.

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Charging Lithium Polymer Batteries

The lithium cells have to be charged in a very different way than the NiMh and NiCad batteries. These batteries require specialized chargers that are designed in a specific way in order to charge lithium polymer cells. One of the recommended chargers would be the TAHMAZO T26 charger; this is the type of charger that can be used on all cell types and is able to charge up to 10 LiPo cells. This charger features 10 battery memories, which makes it far easier to utilize.

Typically any type of charger that is able to charge the lithium ion will be able to charge the lithium polymer, making sure that the batteries in question have the correct cell count. It is extremely important to note that a NiMh or NiCad-only battery charger is never used to charge the lithium cells because charging the cells is dangerous when using the lithium batteries.

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Manufacturers and experts all recommend extreme caution when charging these cell types.[1] One of the first steps in preparing the charger for lithium cells is to make sure the charger has been set to the right cell count or voltage. If this step is missed the battery could potentially burst into violent flames. To date there have been numerous fires that have been caused directly from lithium batteries. For this reason it is now a standard practice that anyone wishing to use lithium polymer batteries should be aware of how to charge the cells and the safety precautions involved.

Below are the guidelines for charging and using lithium polymer batteries:[2]

  • Only use the chargers that have been approved for use with lithium batteries. These chargers should be designed for use on Li-Ion and Li-Poly.
  • The correct cell-count must be set on the charger. If the user is not informed on how to perform this operation it is advisable to rather use a charger that you do know how to operate or not charge the batteries at all.
  • Make sure to balance charge your new lithium battery for the next couple of cycles. After that you can do it every 10th cycle. This is vital due to the risk of a pack that has become unbalanced, thus having the potential to explode. If each of the cells is showing a reading that they are not within at least 0.1 volt to one another, the user needs to charge each of the cells separately up to 4.2 volts, which means they will all be equal. If after the period of each discharge the lithium pack shows up unbalanced, one of the cells are more than likely faulty and the entire pack will need to be replaced. (Of course, some lithium packs are different and will require a different amount of volts for recharging.)
  • The batteries and the charger need to be placed onto surfaces that are safe before charging the batteries, which means that if they do catch on fire damages can be contained. Some of the suggestions include fireplaces, Pyrex dishes that are filled with sand or a vented fire safe.
  • The batteries should never be charged for more than an hour at a time. Exceeding this time significantly increases the chances of a fire.
  • If one of the cells happens to balloon while on charge, the cell should not be punctured while still hot. This will cause a short circuit resulting in overheating. After you have let the cell sit in a fire safe place for at least 2 hours. Discharge the cell/pack slowly by wiring a flashlight bulb of appropriate voltage (higher voltage is ok, lower voltage is no) up to your batteries connector type and attaching the bulb to the battery. Wait until the light is completely off, then throw the battery away. This is an important step to do so the cell is safe enough to throw away.
  • The batteries should only be charged in ventilated and open areas. (In the case of a battery rupturing or exploding they will emit dangerous material and fumes.)
  • When charging lithium batteries, keep a bucket of sand nearby. This is a cost effective way to extinguish fires. It is very cheap and absolutely necessary.

(Also make sure to check out this battery disposal guide for information regarding instructions and regulations about battery disposal.)

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Final Thoughts

When it comes to handling lithium polymer batteries with care it is important for any user to realize that these batteries can be extremely dangerous. It is very important to follow these safety tips and ensure that the right charger is used.

Featured photo credit: Hexcam via dronetraining.co.uk

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Reference

[1] Battery University: Lithium-ion Safety Concerns
[2] Sydney Radio Control Society: October 2006 Newsletter

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Elise Bauer

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Last Updated on November 5, 2019

5 Best Language Learning Apps to Master a New Language

5 Best Language Learning Apps to Master a New Language

Learning a new language is no easy feat. While a language instructor is irreplaceable, language learning apps have come to revolutionize a lot of things and it has made language learning much easier. Compared to language learning websites, apps offer a more interactive experience to learn a new language.

The following language learning apps are the top recommended apps for your language learning needs:

1. Duolingo

    Duolingo is a very successful app that merged gamification and language learning. According to Expanded Ramblings, the app now counts with 300 million users.

    Duolingo offers a unique concept, an easy-to-use app and is a great app to accompany your language acquisition journey. The courses are created by native speakers, so this is not data or algorithm-based.

    The app is free and has the upgrade options with Duolingo Plus for $9.99, which are add free lessons. The mobile app offers 25 languages and is popular for English-speaking learners learning other languages.

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    Download the app

    2. HelloTalk

      HelloTalk aims to facilitate speaking practice and eliminate the stresses of a real-time and life conversation. The app allows users to connect to native speakers and has a WhatsApp like chat that imitates its interface.

      There is a perk to this app. The same native speakers available also want to make an even exchange and learn your target language, so engagement is the name of the game.

      What’s more, the app has integrated translation function that bypasses the difficulties of sending a message with a missing word and instead fills in the gap.

      Download the app

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      3. Mindsnacks

        Remember that Duolingo has integrated gamification in language learning? Well, Mindsnacks takes the concept to another level. There is an extensive list of languages available within the app comes with eight to nine games designed to learn grammar, vocabulary listening.

        You will also be able to visualize your progress since the app integrates monitoring capabilities. The layout and interface is nothing short of enjoyable, cheerful and charming.

        Download the app

        4. Busuu

          Bussu is a social language learning app. It is available on the web, Android, and iOS. It currently supports 12 languages and is free.

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          The functionality allows users to learn words, simple dialogues and questions related to the conversations. In addition, the dialogues are recorded by native speakers, which brings you close to the language learning experience.

          When you upgrade, you unlock important features including course materials. The subscription is $17 a month.

          Download the app

          5. Babbel

            Babbel is a subscription-based service founded in 2008. According to LinguaLift, it is a paid cousing of Duolingo. The free version comes with 40 classes, and does not require you to invest any money.

            Each of the classes starts with with a sequential teaching of vocabulary with the help of pictures. The courses are tailor made and adapted to the students’ level, allowing the learning to be adjusted accordingly.

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            If you started learning a language and stopped, Babbel will help you pick up where you started.

            Download the app

            Takeaways

            All the apps recommended are tailored for different needs, whether you’re beginning to learn a language or trying to pick back up one. All of them are designed by real-life native speakers and so provide you with a more concrete learning experience.

            Since these apps are designed to adapt to different kinds of learning styles, do check out which one is the most suitable for you.

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            Featured photo credit: Yura Fresh via unsplash.com

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