Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

4
votes
1answer
77 views

I'm trying to build a lipo discharger

The way I want it to work is to slowly discharge the lipo down to storage voltage and then stop. I think the best way to do this is to use a TL431 to control the voltage shutoff and use a power ...
0
votes
0answers
13 views

BMS for 2S Lipos

I have 2 lipo batteries in series, each has a built in protection circuit and these specifications: Voltage: 3.7 Vcc Capacity: 1000 mAh Maximum discharge rate: 2100 mA I need to charge them, but I ...
0
votes
1answer
42 views

What is the internal resistance of a LiPo battery determined by?

Given DKNguyen's answer to my last question, I wanted to know what determines the internal resistance of a LiPo battery. Does it have something to do with its inside chemistry? Is it just roughly ...
1
vote
1answer
50 views

What is the “C rating” of a LiPo battery determined by?

In a LiPo battery, we find the "C rating" to be the maximum discharge rate (current draw) in terms of C (the capacity of the battery divided by one hour). But, what determines this value? Does it have ...
2
votes
2answers
60 views

Lithium Ion Battery and Warm Circuit Board

I’m curious if I have a legitimate concern or if I’m just being overly paranoid. I have a rechargeable Lithium-Polymer battery (prismatic shaped) rated for a max charging temperature of 45 °C. The ...
-1
votes
1answer
31 views

Using a 7.4 V LiPo Battery for an Arduino Feather 32u4

I am working on an Arduino project at the moment, with the following board: Adafruit Feather 32u4 And it says I need 3.7 V of LiPo to power it. However I also have a valve that I want to open and ...
1
vote
0answers
27 views

Standard LiPo battery packs & product liability

I'm designing a high-power portable product that I would like to eventually bring to market. I need to use LiPo battery packs in order to achieve sufficient energy density, but I do not think I will ...
1
vote
2answers
36 views

LION/LIPO battery capacity measurement

What is the cutoff voltage for 18650 3.7V Li-ion batteries? Since there is an internal regulator board on these how can they accurately be measured? When they reach their cutoff voltage will this ...
0
votes
0answers
20 views

LiPo ballancing circuit

I'm designing a circuit board to which I'll be able to connect multiple LiPo batteries (2-6S) and charge them in parallel without bothering user about balancing those packs firstly. So the charging ...
0
votes
2answers
53 views

Calculate battery percentage on LiPo battery?

I have voltage measuring on my LiPo battery that is defined full at 4.2V and empty at 3.2V. This reading is very accurate but I want to convert this to percentage numbers. I know that the percentage ...
-1
votes
2answers
63 views

Limiting current to a LiPo battery [closed]

(Updated: Amended text. The smaller battery is a lower voltage than I originally thought.) I have a small 7.5V LiPo battery that needs a top-up charge of max (say) 500mA from a large 12V LiPo battery....
0
votes
1answer
41 views

Transfer charge from a battery to another battery storage

I am conducting a feasibility study and one of the features of our innovation is that the "charge" that has been stored in our "Li-Po battery" can be transfer to another "battery storage" I would ...
0
votes
0answers
32 views

How to implement coulomb counter using Sigma Delta ADC for Battery Gauge?

I am trying to understand working principle of the fuel gauge units of the LiPo batteries. During my investigation I found that coulomb counting method has been used to calculate energy consumption ...
1
vote
1answer
60 views

How to combine a charger for LIPO battery with a boost step-up voltage converter?

I want to power a device with up to 4A at 5V from a single-cell LIPO battery of 3.7V 5000mAh and be able to charge it. The idea is to have everything packed up inside a case, so I don't want to rely ...
0
votes
0answers
8 views

Series + Parallel Custom Lipo Cell Charging Options

I have a custom LiPo cell, made up of 8x 11.1V 2200 mAh 30C bats. They are wired in pairs in series, and then all four ensuing sets are connected in parallel, to form a 22.2V 8800 mAh battery. I am ...
0
votes
1answer
42 views

Connect two different LiPo batteries in parallel

I am working on a device which needs 1000 mA current at any time. Due to space constraints, I forced to use two different size and capacity battery from the same manufacturer. One is of 270 mAh and ...
0
votes
1answer
19 views

Li-Po Charging from automotive supply and powering load at 3.6v

This question is very similar to many other threads, but with some additional constraints. I require a 2.7v to 3.6v supply derived from an automotive supply (typically 7 to 33v) at maximum of 1 amp. ...
2
votes
0answers
14 views

bq24171 battery charger does not charge

I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
0
votes
0answers
23 views

LiPo-management and alarm-clock sharing on same MCU

I am working on a wake-up light alarm clock project using a small 3.7V LiPo battery (5V USB charger). I am considering using a microcontroller to do the alarm clock function rather than a dedicated ...
2
votes
2answers
104 views

Solar panel as day/night switch for a load

I'm using off-the-shelf components to power a buck/boost LED driver and charge a battery from a 6V solar panel. To power the LED driver from the battery at dusk only, would I have to use a MOSFET ...
-1
votes
1answer
64 views

Building a LiPo battery pack for output 270v DC

so this is related to my other question if anyone wonders. I’m building out a EV battery pack to boost charge a vehicle in real time during heavy duty cycles. The vehicle currently has no external ...
0
votes
1answer
83 views

Charge and discharge lipo batterie with BMS 3S

I am looking for a solution to power a raspberry pi connected to a lcd screen 10 inch with three Lipo batteries 3.7V 5000mAh connected to two BMS 3S for charge and discharge. I designed the following ...
4
votes
1answer
131 views

Li-Po battery ritual when using first time

We are using lithium-ion polymer battery in our project. The battery manufacturer recommends that battery needs to be fully charged and discharged for four times before usage as to reach its maximum ...
0
votes
1answer
66 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
0
votes
1answer
63 views

Powering Arduino Uno with 9 V LiPo batteries

Would it be safe to use two 9 V LiPo batteries in parallel to power an Arduino Uno?
1
vote
1answer
96 views

Connecting a 12V LED strip to a 7.4 2s Li-po battery in addition to two motors

I know this is going to be a completely stupid question, but since I'm working with a Li-Po I want to make sure I get this right. What I am building is a modified Nerf blaster that has two motors ...
0
votes
0answers
35 views

What negative effect may a polyswitch have on Li-Po/Li-ion charging?

I have a single-cell Li-Po battery (3.7V 380mAh) connected to a dedicated charge controller (TI bq21040). The programmed charge current is 180mA. Although the battery is shipped with a PCB with ...
0
votes
1answer
56 views

Chain lithium battery charging board and DC-DC voltage step-up

First I am sorry if it is a duplicate of https://electronics.stackexchange.com/a/151157/207677 I have this two cards: 1 A LITHIUM BATTERY CHARGING BOARD LM2577 DC-DC VOLTAGE STEP-UP (BOOST) MODULE ...
0
votes
1answer
71 views

PWM as a voltage regulator for 12V wiper motors and 14.8V LiPo

I'm using 12V (~40W) car wipers motors for small robotic project. Motors are driven over MOSFET H-bridge (IRF1405/IRF4905) with PWM speed/power regulation. Currently a voltage source for motors is a ...
0
votes
1answer
31 views

TP4056 to charge xS1P li-po li-ion

Very related to this question. While it's already clear that several TP4056 can't be used to charge and discharge several cells, it's not clear to me if it's possible to only charge a battery pack ...
0
votes
1answer
581 views

Charging 2s lipo with 3 wires

I have a 2s lipo baterry pack I would like to charge with a multi-purpose battery charger I use quite often for bigger balanced pack. That one (see picture) does not have a balance wiring harness and ...
1
vote
0answers
70 views

DC-DC buck output voltage

I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant ...
4
votes
2answers
166 views

What is the best way to mount a LiPo battery in a project box?

If you were going to use a LiPo battery such as this one: . . . and needed to mount it safely and securely inside a project box similar to what is pictured below what best way to achieve that?
0
votes
2answers
33 views

Using an LIS3DH at LiPo Voltages

The LIS3DH 3-axis accelerometer specifies that it's supply voltage should be between 1.71 V and 3.6 V. For most applications, this just means you are using either 1.8 V or 3.3 V as your main rail. ...
0
votes
1answer
151 views

I need 5v@500mA to 12v@5A for 2.5 seconds every 5 minutes

I've run into quite the problem. I have a load that requires 12v@5A for under 2.5 seconds. However, my supply is a USB 5v@500mA. This is not an immediate load. The load will only need to be activated ...
2
votes
2answers
298 views

Powering a circuit from either USB or LIPO

I have a small hobby project which includes MCU and some peripherals. It is powered by 3.3V power source and consumes 200mA-800mA for up to a minute. However, most of the time it's in deep sleep mode ...
0
votes
2answers
80 views

Connect 3 Lithium Polymer battery with different capacity in parallel [closed]

I am working on an IoT product with has a total current requirement of 1.3 A at the peak. Due to space constraint, we decided to select Li-Po battery with capacities one with 600 mAh other two with ...
0
votes
1answer
65 views

Powering a RPi and a motor driver with the same LiPo battery

I have a 2-cell LiPo battery, a RPi3, and a motor driver with 2 DC motors. I wanted to use the same LiPo for both, instead of a LiPo for the driver, and a Power Bank for the RPi3. My idea was to use ...
1
vote
3answers
247 views

Best battery to power a Microcontroller outdoors [closed]

I live in a place where the temperatures can range from -20°C to +40°C in different seasons. I need to power a small micro-controller that uses very low energy with a solar panel and a battery. Which ...
-1
votes
1answer
57 views

what extra circuit to make a LiPo charger to a LiPo charger can sharing load?

As a (LiPo charger)(Charger A), I refer to this (LiPo charger can sharing load)(Charger B), this So, I have a LiPo battery with protection module. Can I just connect the LiPo and a LOAD in parallel ...
0
votes
1answer
57 views

Reasonable Li-Po Battery Protection Circuit?

I'm designing a circuit to monitor the voltage of a Li-Po battery (single cell 3.7v, 2500mAh, 25A) and switch off the battery when the voltage drops to a certain threshold. The Circuit will also ...
0
votes
1answer
152 views

What happens when a LIPO drops under 3V? WeMos in DeepSleep doesn't start up again?

I have a Lipo (18650) which is charged by a solar panel (6V/6W + TP4056 charger). It's feeding a WeMos D1 Mini which is put in DeepSleep every 10 seconds. When it's awake, it sends something to ...
0
votes
2answers
112 views

How come consumer products aren't powered by power banks? [closed]

I wonder why no commercial battery-powered consumer product is designed to be powered by power banks. All of the ones I know of have either built-in battery holders or internal LiPos with charger ...
0
votes
0answers
29 views

LiPo Monitor IC vs MCU

I am planning to build an electric bike powered by a 12S LiPo battery, and I am trying to decide how I should implement monitoring of the individual cell voltages. Manufacturers like TI provide a ...
1
vote
2answers
61 views

Can you discharge a 3s LiPo battery from both its main plug and it’s balance plug?

So I’m building a quadcopter, and I want to be able to use the same battery to power both the escs and the flight controller. However, the escs are connected to the PDB which is connected to the ...
0
votes
1answer
36 views

Frequently interrupting the CC charging stage of a Lithium-Polymer battery

Because of design constraints I need to charge a 2S Li-Po battery over its balance connectors using a single-cell charger IC (e.g LTC4002). In order to allow the user to interrupt the charging process ...
0
votes
0answers
47 views

Advice on connecting a Li-Po battery to SMD terminal?

I would like to connect a Li-Po battery pack with female PH connector such as the one shown below to a PCB which will use SMD devices. I have also provided the circuit diagram below and highlighted ...
0
votes
1answer
126 views

Load causes voltage collapse. Why?

I have a circuit where a typical 3.7V LiPo battery supplies power through a bq24074 Charger IC, which should in theory short that voltage straight to the output of the charge-protect circuit, which ...
0
votes
2answers
66 views

Charge current for a 8000 mah lipo battery?

I have a 3.7V lipo battery with 8000 mah nominal capacity. From what Ive seen online, the charging current should be 8A for a 8000 mah battery. Is that true? Will charging it at a lower current damage ...
2
votes
1answer
296 views

Why does my board start smoking when I put in a higher battery same voltage?

I just got my custom PCB in the post from PCBWAY. Plugged in small battery I got with adafruit only 2000mah at 3.7V (PKCELL LP803860) and showed the LED light to show it was being powered so I ...