A protection circuit can either prevent a battery from being over-charged, or discharging too much. Unfortunately we cannot provide circuit diagrams or consultation on how to create one, but we can say there is quite a lot of free information online.
hlw. I have used 12 servo motor for my hexapod.so could u plz tell me wat should b better ratings of lipo battery to get best performance?i am thinking to use diz rating (800 mah,20A,12.6 V).is it okay?if yes thn how long it can sustain.
Be careful when using 7.4V LiPo batteries with RC servos (which normally work best at 4.8V to 6V). LiPo batteries can normally discharge at high current (a meaure of the capacity). The higher the capacity, the longer the robot will run, but also the heavier the battery will be. For hexapods similar to Lynxmotion’s, a 2-4Ah battery is best, and you might get 15-20 minutes of use. 800mA won’t last too long.
i need to control 20 servo…which battery shall i use?
@siddharth surya You need to add up the current required by all servos (assuming you will use them all at the same time) and then choose a battery which can provide that current. For specific product suggestions, please create a new topic on the RobotShop forum and provide details about your project.
Hallo,
If i have a micro-controller that consumes 150 mw and i wanna use 4AA battery, for how long it will stay till it discharge ?!
It depends on the capacity of your AA batteries. If they are 2000mAh (2Ah), and your microcontroller operates at 4.8V (or 6V), then it will theoretically last 2000*4.8/150 = 64 hours.
so i want to power a 12V 0.4A 36oz-in Unipolar Stepper Motor. I was planing on using a 11.1 v 1300mAH lipo battery to power it, power an arduino Uno and a sound board. or should I use my lead acid battery which is powering 2 12VDC motors
@carlos p For more technical questions, it’s best to create a new topic on the RobotShop Forum. We’ll be happy to help.
hello Coleman. Thanks for your post. I have a question: I use a microcontroller (ATMEGA328P, the same as arduino) with a BLE module too, both powered from a CR2430 litium battery (285mAH capacity). The consumption of the complete board (microcontroller + BLE module) is continuosly 0.8 mA but it comes to 4 mA a every 8 seconds (for a very little duration, less than 1 second). The fact is that the battery is going down very quickly: it takes less than 1 hour to put 3.6 volts in the circuit. What can I do? There is something wrong? Thank you!
I need to make an airboat for a 6 meter race. I bought a quadcopter 3.7V mini DC motor. When i use 2 AA batteries it has good speed, but when i changed them to 1 9V battery the difference was incredible. So, is it safe for the motor and the airboat if i use the 9V battery instead of the 2 AA batteries?
@luis r, This depends on the input voltage range of the motor. Normally a 3.7V motor might accept something like 2-5V, beyond which the motor will not operate efficiently, and the life span will be reduced. You need to find the specs for the motor to know if 9V will drastically reduce the motor’s life, or if 9V is within the tolerable range.
@Jose Ignacio What is the maximum discharge rate for the battery (normally in C). We suspect it might be 2-5C, so it can likely discharge at 1.4A (you need to confirm). Your battery’s capacity is only 0.285A, and it’s likely that your microcontroller is consuming well above 200mA (the BLE unit might consume 0.8mA, but the microcontroller is the one consuming all of the current).
is it possible to get 8amps under normal condition from a 4.5v battery…is there some other equipment to get this high power
@divyanshu it depends on the battery, chemistry and discharge rate. Simply look at the battery’s discharge specs.
hey man, thank you for this information.
i have a query. I am using 4x 9g micro servos which run at 4.8v to 6v
& atmega 328 working at 5v.
Both are connected via voltage regulator 7805.
To power all these, i have an 11.1v lipo 1000mah 20c.
But i still havent bin able to use that battery as i fear it might burn the whole system.
How do i deal with it?
@Abheerup You are correct to assume that powering normal RC servos at 11.1V will destroy them. Most 9g servos consume more current than normal standard sized RC servos, so using the ATMega’s pins to provide power is out of the question. You can split the output from the 11.1V; part of it goes to power the Arduino directly, and the other goes to the regulator (which can handle up to 1.5V) to power the servos. You would need to split the servo cables as well: red and black to the regulator, and signal and black to the Arduino.
i have UDI U818A quad-copter and 3.7 li-po batt at 500ma or the largest updrade @ 1.3a is a joke for flight time 10 minutes (maybe)
can i make a pack out of 3aa ni-mh ELB2800! the batteries should hold up that alot longer flight time do you think the electronics of the 3.7v copter can handle nominal voltage of (roughly 4.5v)
@Robo Lis Most quadcopters have a flight time of 10-15 minutes, with a few around 20min. It’s always a compromise between storage capacity and battery weight.
so would i damage the electronic with 4.5 volt power (i’m leaning toward 3aa @ 4.5 v)
or should i go to li-ion 3.1a single rated at 3.7v