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Questions tagged [battery]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy.

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37 votes
4 answers
46k views

Quadcopter liPo battery weight/capacity trade off

I'm trying to find where additional battery capacity becomes worthless in relation to the added weight in terms of a quadcopter. Currently with a 5500 mAh battery, 11.1V, I can get between 12 minutes ...
Chris's user avatar
  • 1,005
19 votes
3 answers
780 views

What's the most effective type of rechargeable battery when taking into account size / weight / Ah?

I'm looking to build an underwater glider robot that will need to remain autonomous for long periods of time, perhaps even months. Power draw should be minimal, and I'm thinking of including some form ...
berry120's user avatar
  • 1,265
9 votes
2 answers
7k views

How to charge a LiFePO4 battery?

From what I've seen, LiFePO4 batteries seem like one of the top battery choices for robotics applications. However, I've seen people mentioning that you can't use a charger for a different battery to ...
golmschenk's user avatar
  • 1,564
9 votes
4 answers
14k views

How can one determine whether a LiPo battery is going bad?

In our lab we use LiPo batteries to power our quadrotors. Lately we have been experiencing stability issues when using certain batteries. The batteries seem to charge and balance normally and our ...
DaemonMaker's user avatar
  • 3,921
8 votes
4 answers
5k views

How to know when a Li-Po battery is discharged?

I'm building a quadcopter and I've seen that a Li-Po battery must not be entirely discharged, otherwise it could damage it. How do you know when you have to stop your quadcopter or robot in order to ...
mimipc's user avatar
  • 415
7 votes
4 answers
5k views

Robot docking for self-recharging

I want to build a simple obstacle avoider robot, but this time I want it to be self-recharging so I am building a dock for this purpose, so I want it to be able to locate the dock and go for it when ...
Jihed Jaouabi's user avatar
6 votes
1 answer
193 views

Do 6 motors require 6 individually-assigned batteries?

For the Dagu Wild Thumper 6 Wheeled platform, or any multiple motor system, do I really need 1 battery for each motor? Or should I just buy 2 for either side of the platform. In addition, for larger ...
Monte Carlo's user avatar
6 votes
1 answer
526 views

Vex motors and tank treads drained 9-volt battery more quickly than expected

I've got a couple Vex 269 Motors hooked up to an Arduino Duemilanove. These motors run a some Vex Tank Treads. I powered the whole setup with an off-brand 9-volt battery. Everything seems to run great,...
golmschenk's user avatar
  • 1,564
4 votes
3 answers
451 views

Best power solution for my robot

I've built quadruped robot which is using 12 servos (TowerPro SG90 Servo) and Raspberry Pi (model B 1). Right now I'm "feeding" it with 5V 2.5A charger. How can I make it un-tethered? What should I ...
sssemil's user avatar
  • 143
4 votes
2 answers
409 views

Choosing motor and battery for a robot

I have a project which requires a robot to move around a room with a flat surface (concrete floor). The robot must carry a laptop. I estimated that the total weight would be 6-7kg (including motors, ...
Anura's user avatar
  • 43
4 votes
2 answers
261 views

Building robots with high reliability, durability, and battery life

I'm involved in research on psychologically plausible models of reinforcement learning, and as such I thought it'd be nice to try and see how well some to the models out there perform in the real ...
zergylord's user avatar
  • 143
4 votes
2 answers
89 views

How do I dispense a greasy fluid?

I'm a agricultural engineering student and complete newbie trying to build a simple mechanism attached to a drone that dispenses a grease-type fluid. However, since I'm not familiar with the field, I'...
Tiago Pereira's user avatar
3 votes
3 answers
98 views

Battery damaged?

Could you please see the attached battery images and tell me if it is safe to continue using this battery or should I discard it?
user3752073's user avatar
3 votes
2 answers
2k views

Mechanical robustness/shock resistance LiPo batteries

How mechanically robust are LiPo batteries? How much force or acceleration can they maximally withstand before failure? What is their (mechanical) shock resistance? For some electrical components ...
JJM Driessen's user avatar
3 votes
2 answers
1k views

Will a 20amp ESC run a Turnigy 2213-980?

I'm a noobie just starting out and trying to come up what I need to build my first quadrocopter, I just wanted to run something by people with some experience before I commit to buying anything. ...
Shannon's user avatar
  • 133
3 votes
1 answer
2k views

How much can realistically be drawn from a 25C max 50C battery?

I am using 8 brushless motors for an octocopter. Each motor can be run at maximum 30A. I use 4 batteries in parallel. How high C number is needed? $$\frac{30*8}{4*2} = 30C$$ When running the motors ...
Friend of Kim's user avatar
3 votes
1 answer
66 views

What Battery Voltage to use?

Im currently designing a small robot that uses 2 of these 12v motors, which are manage by the L298N motor controller board, and is being controlled overall by an arduino. Now I have come across an ...
dka13's user avatar
  • 33
3 votes
1 answer
918 views

Battery system for a robot with a RaspberryPi or microcontroller

I'm building a robot which is actually a rotating ball. All my circuitry will be inside this ball. I'm using a Raspberry Pi as the brains. Apart from Raspberry Pi, I've an H-bridge IC (L298N), a 6-...
Tejas Jadhav's user avatar
3 votes
1 answer
57 views

Battery pack discharged

I used a Turnigy 2200mAh 3S 25C Lipo battery pack with Turnigy balancer & Charger 2S-3S for about a month. Yesterday I left the battery plugged into four ESCs of my quadrocopter. Today I've found ...
Kolyunya's user avatar
  • 133
3 votes
3 answers
583 views

How to get constant motor RPM regardless of battery voltage?

I have a brushless motor with a propeller attached, driven by an ESC and a LiPo battery. I noticed that as the battery level drops, the motor spins slower, which makes sense. My question is is it ...
Johnny's user avatar
  • 41
3 votes
3 answers
311 views

Powering multicopter with multiple dedicated batteries

I am in the starting phase of building a fairly large octo-copter drone. I am currently thinking about the possibility of powering my octo-copter design using 4 separate batteries where each battery ...
RalleGAB's user avatar
2 votes
4 answers
42k views

Does the mAh of a battery mean longer power or more power?

If a Lipo battery has more mAh will it be slower to run out of energy or will it have larger power output? Thanks in Advance
Ben's user avatar
  • 63
2 votes
2 answers
5k views

Charging multiple LiFePO4 batteries at the same time?

I'm looking to use 4 of these 3.2V LiFePO4 batteries. I intend to have 2 pairs of 2 in series in parallel. So two 6.4V battery packs in parallel. Because my setup will be run off of this, it will also ...
golmschenk's user avatar
  • 1,564
2 votes
1 answer
398 views

Powering a multirotor with dedicated batteries for each motor

I'm currently thinking of extending the battery life of my quad by powering each motor and ESC individually. I will be using 1 dedicated battery for each motor, and 1 dedicated battery for the flight ...
Kenneth .J's user avatar
2 votes
1 answer
79 views

how to know if the LIPO battery I have is compatible with the motors and motor driver I have

I am building a robot and I have a concern. Will it properly connect a 11.1V 30C 4500mAh to this motor driver : https://www.pololu.com/product/708 thanks in advance ..
ShehabAldeen's user avatar
2 votes
2 answers
244 views

Parallel connection of batteries with equal voltage but different Ah?

I bought some batteries for a project with the recommended voltage but too weak Ah. The batteries are to be connected in parallel. I can't currently afford to upgrade both batteries, but I was ...
Hack-R's user avatar
  • 139
2 votes
3 answers
105 views

how to get an 8 hour autonomy for an underwater robot?

CONTEXT: I'm working on a project consisting of making an underwater robot "fish" for an aquarium. It is mandatory to get at least 8 hours of autonomy. I'm responsible of the electrical part ...
Ben Derrahim's user avatar
2 votes
1 answer
2k views

How to calculate battery capacity for my robot system

I am part of a team and we build a robot. I know how many watts all the subsystems of the robot will need and I also know how much time we want to operate it. Our system will need 323.344 Watt and we ...
MichaelDuth's user avatar
2 votes
3 answers
460 views

How to create a stable 48V 10A power supply?

I'm shopping for batteries and it's easy to find a 48V lithium ion battery that has like 30A max continuous discharge rating. However, I know that the battery supply has a variable voltage from 54V - ...
aztrorisk's user avatar
2 votes
1 answer
90 views

What battery capacity would be required to run a component for an hour?

I have a 9.8kW Component that runs at 51.8 Volts. That means I need a battery that has about 9.8kWh of energy to run the component for an hour For the sake of simplicity, say I have some batteries ...
tuskiomi's user avatar
  • 195
2 votes
1 answer
207 views

How to decide between LiPo or LiFePo for robot battery

When choosing a battery for a robot, should you use a LiPo or LiFePo? For LiFePo, the pros: can deliver higher sustained amps many are built to be drop-in replacements for lead-acid batteries and ...
Cerin's user avatar
  • 294
2 votes
3 answers
826 views

Crimp or Solder to LiPo Battery?

So, I'm planning out my second hobby robot(I'm 15). I am planning on using a 7.4V LiPo battery and my idea is to solder on a 3-pin header to connect to the electronics. Anyways, should I solder to ...
Zack Frost's user avatar
2 votes
1 answer
2k views

18 MG996R servo motors control and power

I am currently working an a personal hexapod robot project. I am building it using 18 MG996R 4.8 to 7.2 V servo motors. I would like to use a Raspberry Pi 3 B+ to control it. I purchased a 7.4&...
RayB's user avatar
  • 21
2 votes
1 answer
66 views

battery question for DW558 Explorer (small quadrocopter)

I recently bought a DW558 Quadrocopter (http://www.gearbest.com/rc-quadcopters/pp_110531.html). After few minutes, the battery is dead. Which is understandable since the battery is so tiny. It is a 3....
MrYoshiji's user avatar
  • 123
2 votes
2 answers
419 views

How to decide the battery power for my robot

I need my motor to be powered with 12V, 5A for 1 hour continuously. How can i decide the Ah rate of the battery. Please suggest some lithium ion battery for the specification
user3725099's user avatar
2 votes
1 answer
2k views

How do I if know my quad is powerful enough to take off vertically smoothly and how do I calculate max Thrust(g) for given current(A) and voltage(V)?

If I build my quadcopter with the following components, will it take off vertically smoothly? Frame: F450 glass fiber and polyamide nylon [280g] Landing Gear: High Landing Gear for F450 [90g] ...
Saravanabalagi Ramachandran's user avatar
2 votes
1 answer
212 views

What charger to use with my ZIPPY Compact 6200mAh 4s 40c Lipo MultiRotor Battery [closed]

Hello I am trying to build a Quadcopter for a school project and I need to finish quick before our mission trip because I was asked to finish it before then so that I could take it. But I am having a ...
Ben's user avatar
  • 63
2 votes
2 answers
1k views

Am I calculating my drone's power consumption right?

I want to make an drone with these motors: https://www.amazon.com/XtremeAmazing-2200KV-Brushless-2212-6-helicopter/dp/B01M3UBGU9 1: First of all, are they good? If not, could you suggest me other ...
Vincent Quirion's user avatar
2 votes
1 answer
39 views

Going around Voltage Limitation on Battery for Steppers?

Am building a device that will use two stepper motors and a servo. One of the main requirements, is that the on-board battery cannot exceed 9.6 volts. The stepper motors have not been picked yet, and ...
RocketPenguin's user avatar
2 votes
1 answer
146 views

Switching from wall power to battery and back again

I'm in the final phase of my BeerBot* project, and I'm looking for the best way to power it. BeerBot will spend most of his life sitting in a docking station, keeping his battery charged and running ...
Jeff Loughlin's user avatar
2 votes
1 answer
100 views

Create 2 light red/green

I am working on a project with the Create 2. Just recently I have run into a problem with the battery state. The Create 2 has been charging all night so its clean light shows green. However, when I ...
robotCoder's user avatar
2 votes
3 answers
453 views

Are there any Lithium Ion battery monitors designed for hobbyists (quadcopters)?

I have a friend who is getting into quadcopters and being the good techie buddy, I'm trying to find the right technology for battery monitoring so his expensive machine does not fall out of the sky ...
hauptmech's user avatar
  • 4,445
2 votes
1 answer
2k views

Using DC motor as a generator to recharge battery of my robot

I am trying to recharge my 12V lead acid battery with a 12V DC motor. I am using the battery to power the robot when it climbs. When it descends, I notice that I dont need to apply reverse voltage ...
goddar's user avatar
  • 311
2 votes
1 answer
43 views

Extending iCreate battery power for auxilliary equipment

I plan to use the icreate as a platform to carry a tablet, or notebook PC and want to have power for some time so I need more than the 3000 mAh battery. I want all to be powered from same battery ...
Nickfixit's user avatar
2 votes
2 answers
2k views

How to provide power to a robot/raspberry pi?

I'm building a robot and powering it with a Raspberry Pi. I am looking at this battery pack, but I am flexible with which one to use. My problem is that I need to be able to charge the robot while it ...
James Westman's user avatar
2 votes
1 answer
203 views

Robot start-up movement problems

I have created robot using a robot chassis kit from hobbyking. At first when testing the robot connected to USB power source and the wheels lifted above the ground everything seemed to be OK. Then, ...
Niko Gamulin's user avatar
2 votes
0 answers
117 views

How could I make an all electric model rocket? [closed]

What I've been noodling on is how to convert that energy into thrust to create an all electric model rocket. I got as far as realizing that dumping electricity from a battery into a capacitor might ...
Jonathan Koomey's user avatar
2 votes
0 answers
118 views

McKibben artificial muscles and the 400:1 ratio

I was recently reading that those artificial muscles had the highest power/weight ratio while electric motors only have a ratio of less than 100:1. As electrical engineer I have never worked with ...
Mehdi's user avatar
  • 681
2 votes
1 answer
629 views

Salvaging a bunch of laptop battery packs

I'm working on my first robot project. I previously used a 12V 6Ah sealed lead acid battery, but recently I aquired some 15 ASUS Li-Ion battery packs, each of them 14.8V and either 2200 mAh or 4400 ...
frodeborli's user avatar
1 vote
3 answers
1k views

Can too much input current destroy my motor driver?

I have a 18 V rated driver I'm using to drive two 12 V DC gear motors using my Arduino. I bought a new battery pack which is rated 3300 mAh 25C, 11.1V making the total current input 82.5 A. My driver ...
YaddyVirus's user avatar