Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lithium-polymer]

108 questions
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How much do lithium polymer batteries expand in volume?

I'm designing a device with a small lithium polymer battery (4x12x30 mm, 120 mA-h). Looks like this: I've heard that there is a rule of thumb that the space left for the battery in a case should be around 10% larger (I suppose primarily in…
Alex I
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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 cells, and if I'm not mistaken, each parallel…
vicatcu
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Looking for a explanation/cause of lithium polymer battery failure

I'm hoping that someone on the EE StackExchange could give me some insight into what is going on with some lithium polymer batteries that I have under test. The question I am trying to answer is: what conditions/causes lead to the type of failure…
RobGah
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Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V and capacity of 300mAH. However I found the…
RS System
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What type of fire extinguisher do I need for lithium polymer batteries?

I plan on using reasonably cheap powerbanks (like the Aukey Mini 3600mAh) with my own circuits, and - ideally - I'd like to have an appropriate fire extinguisher on hand in case I mess up. I know that there's protection circuitry inside these…
Stefano Palazzo
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Replacing three AAA batteries with a 3.7 V, 1200 mAh lithium battery

I have earmuffs that use three AAA batteries that need to be replaced after one day's worth of continuous use. I was wondering if I could replace these batteries with a 3.7 V, 1200 mAh lithium battery similar to this one from AliExpress? I already…
WillNZ
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Solder reflow pure nickel strip to PCB ENIG pads

I've arranged for a custom shaped strip of pure nickel that I intend to solder to ENIG pads on a PCB using reflow/paste. Will we have problems getting the solder to adhere to the nickel? Is there a trick to it? Other (potentially relevant)…
Dan
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Lithium Ion prolonged lifespan

According to the Battery University, charging a Li-ion cell to just 3.92 V is the optimal voltage to avoid stress and lithium plating. Problem is, nearly all consumer chargers focus on going to 4.2 V for longest battery life. When charging, should…
sryan2580
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Charge Li-Po battery with TP4056? (Or what else?)

I bought a single cell Li-Po battery and two different charger modules (one without protective circuit and one with protective circuit) from AliExpress. The Li-Po battery has a protection circuit board. Both charger modules have the TP4056 chip. I…
x-ray
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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 24VDC deep cycle battery bank. The charger is…
kbyrd
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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 size! Both are very equal in voltage and…
Rodrigo
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Charging a lithium battery to 4.34 V

I recently came across a device (a headlamp) with lithium-polymer battery, which is marked 3.8 V nominal voltage, instead of usual 3.6-3.7 V. It's charging circuit is based on ME4057D chip, which is a 1 A lithium battery charger. The suffix -D in…
simonov
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TP4056 with DW01, can I use a diode to create an "UPS"? Design review

I'm studying lithium cells and their related mainstream modules. One of the most common -yet wrong- use of the TP4056 module is to use it with the USB 5V input and an active load on the output (at the same time). AFAIK this will screw up the charge…
theGarz
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What would cause my eReader's battery to suddenly start smoking?

I was listening to some MP3 files on my eReader while shopping at a hardware store, looking at a power generator. I previously checked the battery's percentage and it told me that it was at 80% approximately. Then, ten minutes later, it told me that…
HeavenlyHarmony
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MCP73831 Li ion battery charger problem with load sharing circuit

I am building a device which is being powered by single cell Li ion battery (1100mAh), i am using MCP73831 Li ion battery charger and controller in my design to charge the battery. I am using below Load sharing circuit in my design I have got the…
Mudassir Hussain
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