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Questions tagged [lithium-poly]

Lithium Polymer batteries

0
votes
2answers
576 views

Monitoring Lithium Polymer Battery Voltage from Microcontroller

I am working on a project in which a microcontroller (specifically an RFduino) is powered by a LiPo battery and the microcontroller needs to monitor the voltage of the LiPo. Five of the RFduino pins ...
1
vote
2answers
244 views

Finding an ESC for a LiFePo4 Battery

I have a project that uses 12S LiFePo4 batteries, and I need an electronic speed controller. The main problem I have is that pretty much all the existing ones I've found are designed to work with Li-...
0
votes
1answer
445 views

Paralel charging two Lithium Polymer batteries on a MP3 player Colorfly C4

Is it a good idea to replace a built in lithium polymer battery rated: 3.7 V, 2000 mah with TWO x brand new 3.7 V, 1800 mah (...
0
votes
1answer
126 views

How to interpret step-up output current with respect to input/output voltage

I have a Pololu 12V step-up converter (U3V12F12) that I'm powering with a 3.7V 6600mAh lipo battery. The idea was to use it to power a dev board that requires a 12V input. The dev board draws about ...
-1
votes
1answer
427 views

Lipo battery doesn't charge cell no 2 [closed]

I wasted a lipo battery earlier. I googled so I know that when it goes flat it is unusable. Then I bought another battery of same type 3s. After using it for a month or 2, it suddenly started showing ...
0
votes
2answers
294 views

Lithium Ion battery charging

Its just a simple Question Lets Say, I have 4 x Lithium Batteries each 6800mah capacity and Lithium Battery Charger IC BQ24618 from texas instruments. Will I be able to charge these batteries ...
3
votes
1answer
301 views

How do you protect a Li-ion / Li-polymer battery from over-dishcharge?

I'm setting up a power regulation system for a lithium polymer battery, but I'm aware that my LDO will continue to draw current from the battery even after it's fallen below an acceptable level of ...
2
votes
2answers
802 views

How can the SparkFun Lipo USB charger power other devices at the same time as charging?

How is this SparkFun charger capable of charging a LiPo at the same time as powering other devices? The Set up would look like this: This is what the schematic looks like. Basically, my confusion ...
1
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2answers
133 views

Does slowly charging a battery extend the lifetime? -Why?

Does slowly charging (like usb: 500mA) a battery of a cellphone/ tablet/ notebook increase the overall lifetime of the battery itself? If yes: why is it ? Why do LiIon batteries lose capacity over ...
4
votes
1answer
723 views

Will it hurt a non-powered power supply to see 12/24V on the output?

For an RC (mostly LiPo) battery charging setup I've got a 48V Meanwell AC->DC PSU supplying power to the charger. I'm considering simple ways to power the charger either by this PSU or directly by a ...
1
vote
3answers
1k views

How to gauge safety of cheap Lipo batteries?

I see a ton of cheap 12V lipo batteries for sale on Ebay, but other than the mAh rating, I can't find any info or datasheets on how to safely operate them. I'm looking for a good battery to power a ...
0
votes
1answer
314 views

Charging questions, current limitation and voltage

I'm having few issues with chargers, current delivered to a device etc... just need to connect the dots I guess. When I connect a phone to a charger for example IPhone which is rated at (5v,1A max), ...
2
votes
1answer
1k views

How to design a Lithium-Ion battery pack?

I have a project that I am working on that requires the use of a rechargeable battery pack. The major issue I have is that the battery pack needs to be as slim as possible. So far all I could find are ...
1
vote
1answer
536 views

Difference between Lithium Polymer batteries of varying capacity and cell amount

I was looking to purchase a LiPo batteries online for a side project. Upon shopping around, and reading up on LiPo batteries, I have a fair understanding on what the numbers/letters on the battery ...
0
votes
2answers
1k views

Best way to power sensor circuit from LiPo

I want to make small (~cigarette pack size) oscillometric blood pressure monitor (with arm cuff). The device will be powered by single cell 3.7V LiPo battery with USB charger circuit, without LCD ...
0
votes
1answer
3k views

Adafruit trinket power question

I am reading the Adafruit Trinket tutorial here. It states that BAT+ is used for battery INPUT: If you want to power the trinket from a battery or power adapter or solar panel or any other kind of ...
0
votes
1answer
662 views

Faster charging of Lithium Polymer battery possible?

I am designing a system which needs to run for 3 minutes, then charge as quickly as possible, then run for 3 minutes, then charge as quickly as possible, and so on. In order to reduce the charging ...
0
votes
1answer
121 views

Is there any way to control a 12Vdc relay using 60Vdc line

I have a 60V li-ion battery back with PCM board attached to it for protection. According to the PCM datasheet, under fault condition the PCM cuts off the load and thus isolates the battery bank. The ...
0
votes
4answers
2k views

How can I feed the right current to a superbright LED with a 3.7V LiPo battery?

I'm trying to do something that seemed simple at first but is proving to be complicated (shocker, right?) I want to power a super bright LED (Luxeon K2, Cool White, 350mA. It's discontinued, but the ...
3
votes
1answer
398 views

What battery has more capacity: Lithium Polymer or Lithium-ion battery?

In my project I need a battery with a cylinder of 10mm diameter and 35mm high. I thought only Lithium Polymer technology can create battery for this size. Now I discovery Lithium-ion can have the same ...
1
vote
1answer
120 views

How can I charge just one Lithium Polymer cell?

I have a small 3.7V 100mAh Lithium polymer battery. This is just like any other Li-Pol battery, but it is smaller. Like any rechargeable battery, I want to recharge it. From what I found online, I ...
0
votes
1answer
504 views

powering android phone from 3 AA battery directly (not USB!) [closed]

I have Sony Arc phone which was spoiled by me (story OutTopic) as it won't charge lion battery anymore. the phone itself works perfectly. I don't want to do the regular 3AA to USB charger way. Trying ...
2
votes
1answer
545 views

From Li-Ion to Li-Po battery: design a new battery pack for old mobile phone

I have an old working mobile phone. The battery, a compatible 3.6V 500mAh Li-Ion is almost dead (the original one was 800mAh). Is it possible replace the battery pack with a 1200mAh or so Li-Po ...
10
votes
1answer
1k views

Intelligently Charging and Profiling Lithium Polymer Battery Packs

Lithium Polymer battery packs are widely used in Radio Controlled (RC) airplanes among other things for their charge/weight advantages. These packs typically consist of X series cells and Y parallel ...