At unmanned tech we have tested several chargers from various manufacturers and feel that this one is the best when you consider performance, usability and price. The other great thing about the B6 mini is its compact size so it does not take up much room at all in your toolbox. Using a more advanced charger like this ones gives you extra features that include the ability to discharge your lipo to storage mode and it also has the ability to charge other types of batteries too.
However the two features that make this unit stand out from the rest is the options to add a wifi module so you set and monitor your charge from your smartphone via wifi. A temperature sensor can be attached to your battery for added safety so that your charger will stop charging if your battery gets too hot. It is priced to be very affordable but unlike some of the cheaper alternatives you dont have to worry about it incorrectly charging your lipos. I personally enjoy using these chargers as you dont need to set anything up, just plug in your balance lead and it will start charging.
No need to specify the cell count, charge rate or set any other functions. The E3 charger can charge 2S, or 3S lipo batteries but if you want the ability to also charge up to 4S batteries you can also consider the SkyRC E4 charger. You will hardly ever come across higher cell count lipos unless fling more professional level drones so the E4 will undoubtedly be perfect for hobby level flying. There are a few important specifications you should look at before buying a lipo battery charger.
This process will check the voltages of each individual cell in your battery and ensure they all have the same voltage. This is a critical factory to monitor as if one of the cells voltage increases or drops below the required voltage range the battery could get damaged, or worse, catch fire!.
Fortunately, as I mentioned basically all chargers have this ability. If you need to plug in the balance leads from your battery to you chargers, its a good indication that your charger has the balance function. If you just connect the main connector to your charger, then your charger does not have the balance function.
When using the main lead your charger is only able to read the overall voltage of your battery and not the individual cells so its critical that you check these with a volt meter, or battery monitor to avoid any potential issues with you battery. You can also purchase separate battery balancers to ensure the voltages of each cell are correct, but these are very uncommon nowadays.
Some chargers like the one included with the DJI Phantom 3 many not appear to be a balance charger, but that is because the phantom 3 battery actually has a built in battery monitor and balancer built into it. Cell compatibility When buying a charger you should consider what LiPo batteries it can support.
Some very cheap lipo chargers will only support 2S or 3S lipos, where the fanciers ones will be able to support the full range from 1S to 6S. Other higher end chargers are also able to balance charge more than one LiPo at the same time. Charging current Most batteries specificy a maximum charge rate as 1C, 2C etc… however most chargers you specifiy the charge rate in Amps, so sometimes there is confusion between these two values.
To convert your battery C charge rate to Amps you simply need to multiply the battery capacity by the C rating. So lets say we have a mAh battery with a charge rate of 2C.
So the maximum current we can charge this battery at is 2. Similarly lets say we want to charge a mAh battery at 1C, the max current we will need to set on our charger is 5. The maximum current you can for your charger depends on the power output it is cable of as described in the next section. Power Output All batteries have a certain power output level, defined in Watts, typically around 50W.
This number represents how much power the charger can provide to your battery, ultimately the larger this is, the faster it can charge your battery. Watts are the product of current and voltage, so if you keep current constant say at the recommended 1C value you will use more power with higher voltage bigger cell count batteries. So having more power available it better. Lets look an example, if we want to charge a 3S mAh battery at 1C we will need to use If we want to charge a 3S mAh battery at 1C we will use Power Supply Some batteries include a built in power supply so you dont need to worry about this.
But if your battery does not include a power supply you will need to make sure that the one you buy will match your charger in terms of specifications and also the connector is the same. At Unmanned Tech we have the option to add a compatible power supply on most of our chargers.
Bogdan Bogdan 1 1 gold badge 3 3 silver badges 15 15 bronze badges. There are IC's that will charge each battery on an as-needed basis. Trying to charge batteries in series with an equal charge distribution is nearly impossible.
Add a comment. Active Oldest Votes. Normally it is assumed that a pack is assembled with balanced cells thus a regular BMS is not designed to balance huge differences. Normally lithium cells have a very low self-discharge rate and are quite evenly matched so only minor balancing is required to keep the pack in good working order. Most BMS boards that have balancing only pass a very small current from the most charged cell to a shunt resistor thus they effectively waste charge until the other cells get to the same level.
Most balancing circuits don't pass current from a cell to another active balancing because it's more expensive to do so. Depending on the charging circuit, balancing is not active all the time but might be active only during the and of the charging. Since a large imbalance should not happen it would be stupid to waste energy from a more charged cell when the pack is disconnected from the power supply.
It takes many cycles to balance the cells. The imbalance per cycle of properly matched LiPo cells is usually less than 0.
Colin 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. TJinTech Home. My Heli Hobby and such. My Projects. Support the site.
Electric RC info, how-tos and such. Reviews, Solutions and such. RC Wiring Diagrams and such. I am no expert on this subject. I did not go to school to learn how to charge lipos nor did I even attend a 1-day seminar on the subject. Everything written below is from personal experience, online reading and basic understanding of electrical circuits. If you find a mistake, please let me know. Lipo charging in basic terms The goal of a lipo charger is to charge a lipo to a specified voltage.
That voltage is based on the number of cells multiplied by 4. The charger goes about this by adjusting the output voltage in order to make current flow to the lipo.
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