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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24 views

Overvolting brushed motors by 0.2V

For RC models, I own several brushed motors which are intended to operate at 7,2V. According to my previous tests, they usually take 25 amps, 30 being the absolute maximum. To divide by two the weight ...
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1answer
25 views

11.1V battery charging with optional solar panels

We (beginners) are trying to build a paddle streamer with stepper motors and drivers salvages from an old 3D printer. We would like to drive the motors with 12V (or 11.1V) and the control electronics ...
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69 views

How can LiPo smartphone batteries keep working even after completely discharging them? [closed]

If LiPo batteries shouldn't be discharged below 3V, then how are we able to discharge the LIPo phone battery to almost zero, recharge it, and the battery still works?
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Lipo battery charging [closed]

I have the circuit shown in the picture attached. The switch box converts AC to DC from the power source and supplies to the Motor. It also charges the Lipo battery though the balancer charging module....
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2answers
43 views

Proper algorithm to charge LiPo batteries

We are going to develop a new LiPo battery UPS circuit for our handheld. I have read couple of articles and almost all of them recommend to charge the battery based on the following curve. I have also ...
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1answer
49 views

Make 9v ups for router with TP4056 and MT3608

I am building 9v UPS for my wifi router using TP4056 lithium-ion charging module and MT3608 stepup converter. If USB power is available I want MT3608 to get power from USB (TP4056 Vin Pin) otherwise ...
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1answer
38 views

Use CP2102 as self-powered or bus-powered

I'm drawing a LiPo 3.7V charger circuit. This circuit contains a power path to continue delivering power to the circuit, or by battery or usb. In the final of the circuit I've an LDO to 3v3. Now, I ...
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30 views

Powering and dimming white LED from single-cell 3.7 rechargeable lithium battery (with a 3.3V Arduino mini)

I'm designing a circuit for a handheld project that runs from a 1-cell rechargeable Lithium battery (18650 or prismatic). The circuit powers an Arduino Mini Pro running at 3.3VDC. The Arduino board ...
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18 views

LiPo battery certification standards for EU and US

We are bringing a wearable product to the market that is powered by a 3.7V LiPo battery. The product will be sold initially only in the EU and US markets. We are currently in the process of performing ...
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46 views

Solar powered TP4056 Lipo Charger burning

My project is to build a porch light which will run on a 3.7V Lipo battery, which is charged via 5V solar panel during the day. It has a PIR sensor and has a set timer to light a large LED once a ...
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22 views

5V Lion Battery with battery charger Module

I am using 5V push pull solenoid for my project and drive this solenoid through transistor circuit which is connected to Arduino. I want to give 5V power supply through rechargeable battery with USB ...
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4answers
96 views

Linear voltage regulator for LiPo and 3.3V@200ma ESP8266 - most juice

I am looking for a linear regulator that would follow these rules: input voltage from 3.3 - 4.2. (18650 battery or x3 AAA batteries) output voltage 3.3V @ 200 mA max. (for ESP8266). small footprint - ...
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50 views

What does this mean in datasheet : 2k: Ipgm/10 for term; Ipgm/5 for precharge

I was referencing the datasheet for BQ24040 Texas Instrument IC and could not understand the following statement and what does it actually mean. I am new to this. Can some one explain what does it ...
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1answer
46 views

protection IC stopping battery from charging

So, I'm using an AP9101C as protection IC and MCP73811 as a charger IC for a single cell lipo like this: The load works fine and when I connect +VDC (5V), suddenly CO of AP9101C goes to 0 preventing ...
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1answer
68 views

Multi-cell LiPo charging from 5V USB, without boost circuit

For various reasons I'm happy to describe in the comments section, I would like to charge large (>30S @ 1-30Ahr) packs directly from USB. Speed is not critical and multi-day (or week) charging is not ...
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30 views

Battery Protection IC With NTC Thermistor

I have a battery design which is failing EN 62368-1 for thermal cut-off on charging conditions. IE. at the maximum temperature, charging currents need to cut off at maximum temperature. I am looking ...
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19 views

General LiPo and Li-ion question regarding NTC

Is it only me or are most of the smallish (1500mAh) LiPo rechargeable batteries don't have the NTC pin (only POS and GND)?
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1answer
40 views

How can I design a light-weight, on-board battery & charging system for a self-charging robot?

My project involves the robot navigating to its charging station, docking, charging, then resuming whatever it was doing. The robot is a hexapod with 18 leg motors, 2 camera motors, and will be ...
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39 views

Connecting LiPo Battery Protection Circuit Modules in Parallel

I'm working with three 6S very high capacity LiPo batteries (22000mAh each) and I've designed a power circuit that implements them in parallel to provide 25.1V to the load when fully charged. I've ...
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41 views

PMIC for ESP32 project

I'm looking into improving an existing battery driven design with a PMIC chip. The device runs from a single LiPo cell, sleeps most of the time and wakes up every 20 minutes or so to update an ePaper ...
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43 views

How to charge multiple 3.7V LiPo batteries in parallel?

let's say I have 4x 3.7V LiPo batteries connected parallel. I want to use TP4056 charger boards to charge them. (see picture) As a power supply, I use a 5V 15A adapter, so there is plenty of power ...
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2answers
40 views

Simultaneously Charge and Discharge a LiPo

I have what seems to be a rather common problem, a circuit in which i wish to be able to simultaneously charge and discharge (use) a LiPo battery. The "charge" going "into" the ...
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44 views

Puffed lipo battery

I had an old laptop battery with 3 lipo batteries inside each 3.7v 4300mAh, 2 of them were fine, one puffed. I made a powerbank out of good ones and then decided to test puffed one, connected it it ...
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1answer
24 views

Charging 1S 850 mah battery at low current, 4.2 volts max, potential issues

On an Atari ST computer (1985 -> 1987), there is an optional battery backup circuit board for the clock chip (6301). The voltage output by the board to the battery cable with zero load is 4.17 to 4.20 ...
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50 views

How to prevent a battery powered microcontroller(ESP32) from reseting when motors start running?

I am working on a brushed motor quadcopter. It is powered by a 3.7V LiPo Battery. I have an ESP32 microcontroller which sends PPM signal to a SP Racing F3 EVO Brushed flight controller. The 3.3V to ...
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1answer
66 views

Boosting 18 V drill battery to 60 V to power LED lights, problems with voltage stability

I have a bunch of Dewalt 18 V batteries and 2 LED shop lights that I converted to DC, specifically 60 V, 1.5 amps per strip. I have had mixed luck and I am looking for a better approach. I have no ...
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1answer
25 views

Help with LiPo/solar panel/motor circuit

For a school project I am working on, we have been instructed to use the following circuit design: If you can't see the image, here's the general idea: The solar panel connects to battery via SW2. ...
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1answer
48 views

If I have a battery that provides a high current at almost constant voltage, how do I use it to power other components that require lower currents?

I have a drone which is powered by a 2200mAh 11.1V 40C/80C LiPo Battery. I want to power a Raspberry Pi 3 B and a video transmitter (TS832) that is rated at 220mA at 12V. Do I need to add resistors or ...
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61 views

Feedback on USB-C Power + LiPo Battery + Nema 17 Stepper Motor PCB Design

TL;DR: I need a technical check on my circuit design that utilizes LiPo battery & USB-C charging. Hi everyone, I've been working on a project to build my own camera slider. It's powered by ...
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1answer
43 views

Battery Management Controller

I designed a wearable with a 3.7V Li-Po battery (381018). Everything worked good at the begining and now after 6 months I realize some circuits are not charging anymore. For what I understood when I ...
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1answer
79 views

2S Lipo charger circuit with Adafruit MCP73831 OR alternative?

I studied several topics and sources on the net, besides Adafruit's own, and decided to try designing my own circuit. My goal is to develop the prototype of a robot/drone that does not require me to ...
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26 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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27 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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37 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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2answers
90 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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29 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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4answers
279 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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1answer
55 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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43 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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61 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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26 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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61 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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86 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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1answer
41 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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53 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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182 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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1answer
46 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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1answer
32 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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1answer
54 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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2answers
163 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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