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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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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 ...
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14 views

Suggestions for utilizing a lithium-polymer battery to power a microprocessor and approximately 5m of 144 LEDs/m?

I do apologize if this may be asked by someone else in a different context but as someone with no prior knowledge or understanding of electrical work, I may have overlooked and overthought about my ...
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2answers
51 views

Stored LiPo battery voltage going up

I have an 8s8p LiPo battery with a fully charged voltage of 25.9 V and 25 Ah. This battery was used to run a brushed DC motor (rated current 1 A) using a motor driver circuit (which I assume helps ...
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18 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 ...
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21 views

Switch between charging source for LiPo battery using PMOS?

I have a 3.7V LiPo battery, a usb charger this one and a solar MTTP LiPo charger (this one). The goal is to use the solar charger as default and the usb as a back up. Especially, when charging with ...
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46 views

How to make this circuit to use a single USB for programming and charging?

everyone, I am making a simple circuit with a led strip (ws2812b) 1 using a wemos d1 mini clone (esp8266) [2] and a lipo charger usb module (TC4056A) [3] here is the breadboard diagram in fritzing: ...
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15 views

3S LiPo Charger and Balancer CIRCUIT request

I am in need of a circuit that can charge and balance a 3S1P 1000mAh LiPo battery @250mA. Does anyone have one of know of where to find one? A little bit of project background: I've been messing ...
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38 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 ...
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59 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 ...
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53 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?
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20 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. ...
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139 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 ...
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2answers
80 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 ...
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2answers
64 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 ...
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34 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 ...
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3answers
160 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 ...
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1answer
34 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 ...
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41 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 ...
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103 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 ...
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2answers
107 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 ...
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16 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 ...
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41 views

Calculating Rprog for MCP73213 Li-Po charging IC

I would like to use the MCP Microchip MCP73213-A6SI/MF to charge a 7.4v 1000mAh Li-Po battery. (This one). The website doesn't give much information but mentions that the continuous discharge current ...
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2answers
24 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 ...
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30 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 ...
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14 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 ...
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1answer
99 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 ...
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2answers
48 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 ...
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1answer
276 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 ...
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1answer
100 views

Li-po battery protection

I have got schema of li-po battery protection circuit. translation of czech title of components: Napěťová reference = voltage reference Zátěž = output of protection circuit Battery has got 2.75v ...
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33 views

Charge 2 18650s with eBay charger + pcb

I'm currently building my own Bluetooth Box and need a portable power supply. For that I use two 18650s LiPos and a PCB Protection board. PCB Protection board: https://rover.ebay.com/rover/0/0/0?mpre=...
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26 views

Charging 18650 Lipos with PCB and micro USB breakout board

I have a circuit with 2 18650 Lipos, which are connected to a 2s PCB Protection Board which has a p+ and p- connector for out- and input. My question is whether I can charge the two batteries by ...
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65 views

PCB Protection Circuit for LiPo batteries doesn't output a voltage

I have two LiPo batteries (18650) connected to a 2s PCB protection circuit. I can read a voltage at the b+ and b-, which is about 7.03 V but there's no voltage at p+ and p-. Is there something wrong ...
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1answer
73 views

Powering module directly from LiPo Charger with LiPo connected

I have a GSM module (Particle Electron) which has pins for powering it from a LiPo battery. The pins accept voltages from 3.6V to 4.4V. The module can also be powered from 5V supply through another ...
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47 views

What is the difference between load testing and discharging a LiPo?

I would like to test max discharge rates for 1S (200 mAh) LiPo's. But I can see three ways of doing it: Using a charger, discharge at highest rate and see how high the battery goes. Using a resistor (...
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108 views

Parallel lipo batteries with mcp73831 charger IC

After reading this very informative blog about load sharing while charging batteries, I'm planning on using an MCP73831 in the same configuration as detailed by the blog for use in a project I'm ...
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38 views

One lipo battery to supply multiple circuit boards

I want to supply all my circuit boards with one lipo battery. The design is like this. I need a battery connector cable. So, I made my own battery Y-cable like this. I use XT-90 connector to ...
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1answer
159 views

14watt 6v solar panel feeding to a TP4056 based charger for charging a Li-ion battery

How to design a solar power based power supply for charging a Li-ion Battery of 3.7v 3500mAh, using TP4056 ? Specs about Tp4056 based charger using are it is programed for 1.2A current max, and 4.2v ...
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1answer
154 views

How long to wait between usage and charging of a LiPo (or Li-Ion)

Introduction Like the most of us I've used Li-Ion batteries in many everyday devices. I also use a few LiPo Batteries in RC-airplanes. In the last years I read about their correct usage and charging. ...
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43 views

Designing a Lipo Charger for 1 or 2A charge, 5A discharge

I'm looking for/designing a Lipo charger which can handle a discharging current of 5A at 5V. Obviously, the lipo's charge is 3.7V (max 4.2V, min 3.2V), so most charging circuits inside a power bank, ...
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1answer
49 views

Connecting parallel to Li-po

I think I have pretty newbie question but I couldn't find specific answer for that. I have 7.4 V li-po pack. What I want to do is connect in parallel two dc loads. One will be motor drive which will ...
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1answer
66 views

DC Motor Theory and Practice

My first post here, I have been playing with a DC motor and attempting to upgrade the original batteries from SLA to Lipo, the scenario is as below and i'm looking for some advice on what happened and ...
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75 views

Charging 3.7V battery from 300W+ generator

I am doing a project involving a bike generator of 500W. All of my previous projects were small LiPo battery powered devices so I want to double check certain aspects of this relatively high power ...
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1answer
443 views

BMS for Li-Po with balancing and protection

I want to build a robot based on Raspberry Pi with Raspberry Camera. It will use tracked car chassis to move around my flat. I'd decided to use 3-cells Li-Po battery to power this robot (because of ...
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1answer
48 views

LDO Voltage Regulator - What happens inside dropout range?

I’m using this 3.3V LDO (https://www.sparkfun.com/products/526) to power a device which normally takes 2 AAs (3V), using a 3.7V LiPo battery. The device won’t power on without the regulator (it can ...
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63 views

Solar panel Voc

Open circuit voltage is high in solar panels,when feeding the same voltage to any charge controller IC which has Operating voltage range which is far less than the Open circuit voltage, will that ...
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39 views

Estimating the capacity of unknown LiPo cell

I recently salvaged this small (30 x 9.5 x 3.5 mm) LiPo single cell battery from an old device that lied broken for at least 3 years. Therefore I expected it to be garbage ready for recycling, but ...
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88 views

Beard trimmer powered by LiPo battery [closed]

I'm trying to convert a beard trimmer's motor to run on LiPo battery instead of original Ni-Mh AAA size battery. It occurred to me as simple DIY project, but it turns out that's not the case. ...
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1answer
168 views

Can I supply 2 units of peltier module(TEC 12706) connected in series with Lipo (22.2V ) ? will it damage the unit? [closed]

I need to build a portable temperature control cooler box using TEC. I am using 2 units of TEC which has rating of 12V/6A. I understand that parts of the battery may drain very fast but is it possible ...
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1answer
248 views

TP4056 and Lipo batteries

I have several 3.7V 1800mah and 700mah Lipo batteries that also have the 8205A MOSFET and DW01a chips mounted to the top. I've seen the two types of TP4056 boards (one with these two chips for lipo ...
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1answer
34 views

Analyse charging circuit for a small voice recorder

I'm trying to analyse a miniature MP3 audio voice recorder power/charging circuit. By examining the PCB I've managed to produce this schematic. Some of it looks clear to me. J1 disconnected from USB ...