Tagged Questions

6
votes
3answers
280 views

NiMh or LiPo batteries for unattended charging/usage

I'm in the planning stage of a summer project: A WiFi controlled robot for remotely monitoring a shore home. The robot will consist of a 4-wheel platform (4 motors, 1 A stall current each, 7 V), ...
4
votes
5answers
142 views

Choosing the type of battery for a project

I am working on a machine which consists of 10 servos, and one microcontroller. The servos need to be on pretty much all the time for about 8 minutes. I am planning on using the ATmega16 to provide ...
-1
votes
1answer
741 views

Battery powered portable wall outlet?

For a college competition we aren't given any wall outlets to power our devices. We are purchasing (we don't have it yet) the wireless camera kit in the following link and we need to rig up a portable ...
1
vote
1answer
240 views

Lipo battery monitor for 1s-6s packs

I want to be able to output lipo battery voltage to a display the remaining juice in the battery much like a fuel gauge. It has to work for 1s to 6s batteries and it would be ideal to work using an ...
3
votes
3answers
1k views

Under Voltage Protection for LiPo Battery

I have a 3Cell LiPo battery which I am going to use with an RC Car, and I want to design a circuit to protect the battery cells from going under ~3.3v each. So what do you think of this design? As ...
6
votes
1answer
444 views

LiPo vs. NiMH for kid's toy

I've been researching here and on google regarding potential battery technologies for a toy that I want to make for my kids. I was hoping to get others' perspectives on this, keeping in mind that ...
7
votes
1answer
160 views

Before storage why should a Lithium Polymer battery be charged up to only 40-60%

While storing a Lithium Polymer battery cell or a device with a Lithium Polymer battery why should we make sure to discharge the battery to 40-60% (and only then put it to storage)? What happens if ...
3
votes
1answer
495 views

USB to 3-cell Lipo charger?

I have a data-logger project that needs to run from a 3-cell Lithium Polymer battery. It has 5v and 3.3v regulators to provide regulated power to the system. I want to build the battery into the ...
0
votes
1answer
151 views

MCP73834 disintegrates after a couple of hours

For my first attempt at Li-Po charging I chose the MCP73834-FCI/UN for availability, it has an output current of 1A. I set it up the example circuit in the datasheet and used an 6Ah battery to test ...
2
votes
4answers
875 views

How to power a GSM Modem from a Li-Po battery?

I want to integrate an AirPrime SL6087 GSM modem into a design, this is my first try at working with a GSM module. The datasheet states that the modem draws 2A for 1mS every 4mS (max) at 3.6V, the ...
2
votes
1answer
451 views

Battery charging questions Parallel charging and battery balancing of LiPos

I'm having a long discussion on an RC board regarding LiPo parallel charging. The basic crux is that my understanding of how charging works is something like this: Charger Line voltage of x(8.4v in ...
2
votes
1answer
317 views

POE Battery Survey Toolkit

I want to try my hand at producing a POE battery power supply for use with an access point [AP] for site surveying purposes. My solution is an 11.1v LiPo 3s pack and charger fro a remote control car ...
5
votes
4answers
3k views

Parallel charging of lipo batteries, maximum voltage difference?

There are numerous products that enable lipo batteries to be charged in parallel. Most sources are clear on voltage and capacity requirements, which follow pretty directly from basic circuit ...
2
votes
1answer
291 views

LiPo charger balance plug is kaput

Well, it seems that static electricity has fried my LiPo balance plug adapter. When I was plugging in my LiPo battery to it, which was plugged into my Thunder AC6 LiPo charger, a short wisp of smoke ...
6
votes
5answers
455 views

Need help with LiPO batteries

I am planning on a 1 cubic inch robot as my next project in robotics and the biggest challenge I am facing is on the battery. Lithium polymer seems to be the best option in terms of weight and the ...