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So the battery is not bad, however the actual specifications are a bit lower than the official ones. ReviewsThere are no reviews yet, would you like to submit yours?Disclaimer: These are user reviews.
In part one, we covered some basic ways to quickly and easily power your electronics project.
Take care when implementing these methods and be sure to double check your wiring before connecting power as some of them can fail somewhat spectacularly.
Cons Most applications will need not only a battery management IC, but also a voltage booster!
Lithium polymer (LiPo) batteries have been an increasingly popular choice in a variety of different applications including mobile phones and radio controlled models. One notable downside to LiPo batteries is that they require a non-trivial charging curve which means you can't just plug them in and throw power at them and expect them to behave well. To use a LiPo battery, you'll need to use a separate battery charger (as with most RC cars) or integrate your own battery management and charging circuitry. My recent battery powered projects are using this circuitry with the added bonus of charging directly from the micro USB port which also functions for programming. For an alternative voltage booster that comes in a more easily solderable package, you can try the LTC3525-5. For a simpler projects or prototyping, you may want to find a pre-assembled LiPo battery management circuit. We covered the easiest way of getting DC power from an AC outlet: using a pre-made AC adaptor, but there are other options that avoid a bulky plug against the wall or taking up all the space on your power strips. The above diagram shows the input AC current, an intermediary step, and the output of the bridge rectifier. Pros Can accommodate a range of voltages, small and cheap power supply without a bulky plug. For all of these advanced circuits, take the time to research them on your own before trying to apply them to your own project. Originally a Kickstarter, Reflowster continues to design and build for electronics hobbyists and consumers alike. Lithium polymer batteries last much longer than NiMH packs as they have a far better energy density.
The batteries are rated for 25C constant discharge rate and higher burst ones, but are these batteries really capable to deliver such performance?
Moving to higher discharge rates such as 5C and 10C (5 and 10 times the capacity) the battery handled quite well. Then moving to higher discharge rates of 5C with no problems, next was 10C discharge rate that the battery still managed to handle without issues even though the temperature got a bit high at 62 degrees Celsius at the end of the discharge test. The batteries under that brand are considered to be of quite decent quality and a very good value, though we are going to check how good their perform and if they match the official specifications.
Once your order is shipped, you will be emailed the tracking information for your order’s shipment.
In this section, we'll cover some more advanced methods for powering a project that may not be practical to breadboard out.

In particular, when testing your own AC power supply, I'd advise taking precautions such as an isolated power supply or at least a easy way to quickly cut power from a safe distance. As the battery reaches fully charged, the charging current provided by the chip ramps off to keep the battery from overheating. For most projects, I'd suggest simply adding the battery management directly to your PCB. A simple diode in the USB's power line protects your computer or USB power supply from any feedback from other power supplies you might be working with. Notice how the output of the bridge rectifier, while no longer alternating between positive and negative voltages, is not a clean power supply. Because of the relative simplicity of the transformer and rectifier, you'll find this kind of power supply relatively robust. It solves the two largest problems with the linear power supply in exchange for a bit of added complexity. This is controlled by a specialized integrated circuit coupled with a specialized transformer that switches the circuit on and off to keep the output power steady.
As you can see, the complexity for this sort of power supply is significantly higher than for previous examples.
There is a lot of additional information about the circuit there including specific part numbers, recommendations, and even an example PCB layout. This article is meant only as a list of suggestions to be aware of while planning out a project.
The Turnigy DX7S and DX8 Intelligent Transmitter Pack also features a built in voltage protection circuit, this circuit will automatically cutoff once the pack drops to 2.85v per cell ensuring the battery will not be damaged if you accidentally leave your transmitter switched on. At 15C constant discharge rate in the end the temperature of the battery was a bit hot at 55 degrees Celsius (still within acceptable levels) and the capacity provided was already less than half of what the battery could provide at 1C discharge.
These specifications seem quite reasonable, however we are still going to check if they are true in reality or not.
Moving to 15C and 20C discharge rates the the battery still handles quite well, but the real problem is that it gets way out of the safe operational zone with temperatures of 78-79 degrees. However the official specs about the discharge rates this battery is capable of are far from the reality we’ve measured.
You can choose your preferred shipping method on the Order Information page during the checkout process. Instead, you'll probably incorporate these when designing a PCB or moving toward finalizing a project. Furthermore, they're able to deliver that charge very quickly when compared to other batteries.
You can use the MCP73832 or a similar controller along with the recommended application circuitry between your battery and the rest of your circuit. In this example, I've wired it so that the battery management IC is always running directly off the battery so that you can charge your battery via USB without turning it on. A linear power supply uses a large voltage transformer to drop the 120VAC (or whatever your region happens to use) down to the 5v (or 3v) that you'll most likely want for your microcontroller projects.
To smooth this supply out, we run this messy waveform through a large capacitor and a voltage regulator to produce a clean and consistent 5v.

You'll choose your transformer based on your input and output voltages (in the US, probably 120V in and 5V out).
When designing your circuitboard, be sure to take reasonable precautions with your high voltage traces. When the capacitor drains below a certain point, the circuit switches on momentarily to charge the circuit. Not only is the switching controller required, but a number of auxiliary components including an inductor, a handful of diodes. The voltage protection circuit will also restrict charging to 4.2v per cell ensuring the pack can never be over charged.
These batteries usually find their place in small scale helicopters, quadcopters or planes, so it is very important that you know what they are capable of in order not to crash your flying RC model because of battery not handling as well as it should be and you now aware of its actual capabilities. At 35C discharge rate (21A) the battery is not able to handle properly even peaks, let alone provide a constant discharge. Turning the switch on enables the voltage booster that powers the microcontroller and the rest of your components. To do this, a linear power supply first scales the voltage down to a more reasonable level and then irons out the AC sine wave using a configuration of four diodes known as a bridge rectifier. Something like a 100uf aluminum capacitor will probably be sufficient to take the majority of the noise out of the power supply and the voltage regulator and decoupling capacitor will smooth out the rest.
In general, you'll want to keep a minimum of an 8mm gap between high voltage traces and low voltage traces or components. This is especially important for projects that may eventually need work internationally where the wall voltage may be different than what you're used to at home. This switching mechanism is what makes this power supply able to handle a range of voltages.
A few resistors manage the output voltage of the power supply and some additional optional components can improve the safety and efficiency of the circuit.
The status pin on the battery management IC is currently wired directly to the UC which means you can read the charge status and react to it programmatically. You'll also want to avoid using a high-voltage circuit like this one without some kind of case or shielding to keep stray fingers from coming in contact with the live traces. You'll have to break this habit for high-voltage circuitry where a thin trace will heat up considerably.
This temperature is at the edge of the safe zone for discharge of LiPo batteries, even though this temperature has been achieved with the battery standing on one place and if you are using it in a moving RC model the airflow will help in cooling it a bit and the actual temperature will most likely be lower. They didn’t have the balls to see how their product stacked up to the competition, or 4.
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