Questions tagged [lipo]

Questions regarding Li-Po batteries (Lithium-ion Polymer, Polymer Lithium Ion or more commonly known as Lithium Polymer), including proper charging and usage.

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20 views

DC to LIPO charging module reverse Feedback

I want to be able to use DC 12v to power my circuit but also have ability to have it powered by a battery. The thought I have is: * A on/off switch allows battery output to be switched on/off while ...
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23 views

Is it OK to manually charge a single cell of a 2 cell LIPO battery?

I have a 2 cell LiPo battery and my project involves charging it from a rectified and regulated voltage source. My question is, is it OK if I charge only a single one of these cells instead of both? ...
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35 views

14.8V LiPo Battery Protection

Disclaimer: This is my very first time I have to work with batteries so I have basically no idea whatsoever. I need to protect a 14.8V LiPo Battery from overcharging/overdischarging. I have looked up ...
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80 views

What plug type is this?

I recently bought some LiPo battery packs from Ali, Now im trying to figure out what type of plug it has! Anyone knows the answer? Would be awesome.
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26 views

Low power LiPo cell ADC with an nMOS switch and a resistor or capacitor divider circuit?

This is my first question on this platform and am looking for advice on doing a very low power LiPo battery measurement for a wearable device. My current circuit looks like this: (See image below) ...
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40 views

Charging current/voltage for lipo batteries

I have a 500mah 1S lipo battery. I wanted to charge it with my lab bench power supply. Easy, I thought: I want to charge at 2C (which is 1A) so I simply set my power supply to 4.20V and 1A limit and ...
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54 views

Charging a 3.7v lipoly battery at less then 4.2v?

I'm trying to experiment with supplementing battery power using microbial fuel cells. MFCs are batteries that produce their charge from decaying matter, but they often only get up to 0.9v (unless ...
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39 views

Strange Behaviour of Lipo Battery ESR during charging

I performed three charge tests on a single cell 190mAh Li-Po battery with Keithley Battery Simulator instrument. Charging started at 3V and stopped at 4.20V in all tests. After completing the three ...
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53 views

How to calculate right current to charge 2 cell series 8.4V 4000mAh battery lipo?

I have 4000mAh 2 cell series 8.4V lipo battery I need make a custom charger I am thinking of using LT3650-8.4 2A charging Ic if I set 2A how long will it take to charge this fully /if timer is ...
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25 views

Automatically switch charging lead to highest available connection in a variable series of batteries

I have a circuit which I use to charge LiPo batteries with a balanced charger. The idea was that I want to charge up to three 2S batteries as one 6S battery without the problems related to simple ...
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49 views

Beginner charging + wireless charging IC

This will be more beginner question. Could you please help me choosing the right charging ICs for my project? I have never been doing anything with charging (except Chinese TDA4056 module). Yeah, I'...
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49 views

ESP32 MOSFET Control with a Twist

Looking for some help with using an ESP32 (running Arduino IDE) to control a MOSFET. Currently, I have used the combo to control many things successfully by electronically "pressing buttons" by ...
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21 views

How to connect a Sparkfun LiPoly Charger to an Arduino Nano?

I was able to upload the Adafruit SSD 1306 OLED Library to an OLED Display using an Arduino Nano. Now I want to power the Arduino Nano via a Lipo Battery but the battery must be rechargeable and I ...
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42 views

Lipo Charging Circuit- Relay vs MOSFET

I am currently working on an application which will use both a Lipo and an external power source (DC). The external power source will charge the lipo as well as power the system load at the same time (...
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29 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
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43 views

Drone lipo battery not working properly

I'm having an issue with the lipo battery of a drone. When I normally plug it into the drone it won't power up the drone, but when I connect the battery to the balance charger even when the charger is ...
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31 views

Using a small Li-Po as a backup power source for a model

I am building a model of a trolleytruck (similar to a trolleybus but with a truck) and I'm adding an Arduino to get data. The microcontroller should never lose power because it would restart. I was ...
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28 views

Upgrading Bluetooth earbuds case battery

Recently I got Chinese true wireless earbuds called Redmi AirDots. It has 3.7V 300mAh Li-Po battery in it's charging/carrier box that I want to replace with the one with higher capacity. I opened the ...
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61 views

Balance charging and protecting 4s LiPO battery pack

I'm planning to use a 4s 18650 LiPo pack to power a portable speaker and I'd like to include a charging circuit, so I don't rely on an external balance charger. I currently have it hooked up to this ...
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1answer
67 views

High Short-circuit protection for LiPo Battery

I will be using a LiPo battery for a project, and I want to make certain that I fully understand the safety features of the Protection Circuit Module included with the battery, so that I have a safe ...
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32 views

Li-po cell in RF remote

I am working on a zigbee wireless remote. MCU datasheet says it operates in wide voltage range of 1.8 to 3.8 volts. Besides zigbee MCU, there will be a few LEDs and tact switches (fairly simple and ...
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34 views

Design power bank with BQ24195

I want to design a power bank control board for a single-cell lipo battery. The IC I have selected is BQ24195 by Texas Instruments - datasheet here. I think it is perfect for what I need. It comes ...
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58 views

What kind of battery to choose for my electrical car project

I hope that this is the right place to ask this. I have a small RC car that I opened and added a raspberry pi in. Now I want to pick a battery. First of all I heard that Lipo batteries are really ...
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40 views

DW01 LiPo Protection not auto detecting

I've designed a LiPo charge/protect/boost circuit but am having problems with the DW01 protection IC. The IC successfully cuts off the battery when the voltage goes below 2.4V, but it doesn't auto-...
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54 views

How to safely test a Lithium Battery Management System board

I'd like to design a Battery Managements System board (based on TI bq40z50-R2) for my own small (2-4s) lithium battery pack, but I am still unsure how can I test it safely. I am worried that an error ...
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123 views

tp4056 power consumption

I have replicated the li-po battery charger with the famous TP4056 , the protector DW01A and the mosfets FS8205A... exactly like the comertial board. I design a board that contains this circuit (and ...
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55 views

6S LiPo/BMS combo charging very slowly

I have a battery pack comprised of 2 6S 8000mAh LiPo batteries (link) with each one connected to an individual BMS module (link). I'm trying to charge the pack using a 25.5V dc power source as ...
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51 views

Battery connector and wire ampacity

I’m considering using a JST ACH connector with my LiPo, but I don’t understand whether the current rating on the data sheet is for aggregate or for each wire individually (which is my guess since they ...
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25 views

Present information in coulomb counter in Windows/Linux

I'm making my own mini laptop using the innards of a compute stick clone. One thing that has me confused is how I should interface the battery monitoring to Windows in order to show it in the standard ...
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1answer
69 views

Any reasons why my 18650s go very hot when I charge them?

I have some PanasonXX 18650 batteries the grey and the green one I charge them in 2.5A 4.3v but I found that the green battery is very hot after I charge it about an hour later, I don't know the ...
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1answer
168 views

Are lithium ion batteries damaged by strong magnets?

I'm wondering if it is okay to put a lithium ion battery directly next to a strong permanent magnet. Would this affect the functioning of the battery? Can it lead to early failure? In the worst ...
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2answers
142 views

Can batteries shrink physically in size?

A few days ago I took apart my laptop,an HP BC000nq, with the intention of adding a new 4GB RAM module but I found something intriguing.The battery surface was carved with deep cavities between each ...
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71 views

LiPo short circut

I connected my LiPo battery (4S 1500 MAH 14.8V now 15.2V) to the charger that came in the set through the pins and there was a short circuit. I unplugged the charger immediately. The smell of burned ...
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32 views

Can I put two loads on one battery and both loads draw 3.7v as they expect?

I have a project in mind where I replace the tinny 40mAh LiPO battery of a "smart band" (Like a Mi Band 1) and replace it with a regular 18650 LiPo battery, so it last a long time without recharging. ...
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19 views

Lipo Storage Charge Cell Variance

I am new to RC, and I have got a cheap iMax B6AC (non-SkyRC, but that's because it was $20 more expensive) LiPo Balancer / Charger. So far it works great, and I have been calibrating it (It is about 0....
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47 views

Problem Powering 13.3 inch LCD Screen with 3.7v Battery [closed]

I have been working on a project that involves running a 13.3 inch lcd screen off of a rechargeable battery. I bought the lcd screen and controller board listed below and verified that it was working ...
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1answer
42 views

Protected 3.7v battery as replacement for 3.8 [closed]

I have a set of bodycams that need replacement batteries, and i cannot find anything suitable short of 400 quid to send them back to manufacturer. At that price i might as well spend the extra 100 and ...
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1answer
59 views

LiPo Shrinkwrapped components

Besides over voltage protection, what other purposes are served by the shrink-wrapped (in yellow) components seen here? Do they have any effect on discharge, and will they discharge the battery other ...
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1answer
48 views

Solar panel and power bank

I would like to charge a 20,000mAh power bank with a 18V 20W solar panel. The power bank has 8*18650 batteries in parallel. I came out with 3 options. The first one is to use a buck DC-DC converter ...
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46 views

Safely storing Lipo batteries

Two parts to my question. I see multiple suggestions to use the fiberglas bags for storage of Lipo batteries. How do these help prevent fires? With the oxidizer a component of the Lipo battery, ...
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258 views

Measure LiPo Battery Cells with Voltage Divider?

First, I am new in this topic, so please excuse unnecessary questions. I want to measure the (four) cells of my lipo battery. The connector of the battery has a plus pole and four minus poles. (Image)...
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64 views

Can Lead Acid and Lipo batteries be connected together to achieve higher resulting current?

I have a lead acid battery setup which has 3x12V 12Ah batteries connected in series resulting in 36V 12Ah output. I also have 3 LIPO batteries (1x11.1V 3300mAh, 1x11.1V 3000mAh and 1x12.6V 4500mAh). ...
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68 views

Battery pack solution for a 5V 500mA project

My project contains: Raspberry Pi Zero W Arduino ProMicro 10 5V RGB LEDs I2S amp that drives a 4Ω 3W speaker Currently I am powering it from a 10000mAh USB power bank. But in order to avoid brutal ...
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21 views

Charging and monitoring LiPo battery on docking station

How can I charge a LiPo battery (4 cells) without the "classical Lipo Balance Charger". Also, is it possible to monitor the battery level from, let's say a Raspberry Pi?(Using the 4 pins that are ...
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117 views

Powering up raspberry pi 3 b+ with one 11.1V 3S 2200mAH 30C Rechargeable LiPo Battery

I wanted to power up my raspberry pi with the only lipo battery I have which is a 11.1V 3S 2200mAH 30C Rechargeable LiPo Battery. I done some research, and most of them used a voltage regulator to ...
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1answer
83 views

If I increase the number of motors in a parallel circuit, will my current increase? [closed]

I am new to electronics, and am looking to build my own quadcopter. Before I purchase anything, I want to make sure I can get an appropriate battery to power the motors. The battery I am looking at ...
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39 views

Sense resistor connection

I'm looking throw bq76940 datasheet and I've found such connection of sense resistor: What is the purpose of the additional resistors and capacitors? Why all 3 capacitors are required?
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49 views

Why bq76940 cell0 has two capacitors

I'm exploring bq76940 datasheet. I've found such typical scheme for cells connection: Why VC5-VC4, VC4-VC3, VC3-VC2, VC2-VC1 pairs have only one capacitor and VC1-VC0 pair has two capacitors? What is ...
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1answer
44 views

Trying to understand Battery Chargers vol.2 [duplicate]

The answer by Bill dubuque was very helpful and got me to read the complete datasheet of MCP73831/2, but there is one thing from the datasheet that I don't fully understand and is the cause of lots of ...
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1answer
81 views

Circuit heating

I am using 14.8 Volts 21Ah Lithium ion battery to control a circuit. The circuit consists of a controller, LM2596 buck converter (set to 5.5 Volts), 5v relay driver , 5v electromagnectic relays, and ...

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