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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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32 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
147 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
30 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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1answer
40 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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1answer
87 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
103 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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0answers
13 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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0answers
27 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
22 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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1answer
28 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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0answers
13 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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0answers
28 views

LiPo-charger/Boost converter circuit review

I'm an CS/CE-student and I would like to familiarize myself with the more 'analog' domain of what I am studying. As I'm into embedded systems and µC's I would like to design a small battery powered ...
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0answers
40 views

Can I use Li-ion BMS for Li-Po?

As Li-ion is less maintenance to Li-Po, are there any separate BMS for Li-Po or can I use Li-Ion BMS for Li-Po by checking Max.Current I need? As you know the lipo cells will swell if we fully charge ...
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1answer
96 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
44 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
273 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
92 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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0answers
29 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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0answers
22 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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0answers
31 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
67 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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2answers
43 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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1answer
189 views

How can I find the discharge rate of a phone battery?

I am in a position where I have to use a LiPo battery of a phone, but I can't find the C (max discharge rate) of this battery... only capacity and voltage are mentionned, and can't find information on ...
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1answer
70 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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0answers
36 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
124 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
97 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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0answers
35 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
57 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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0answers
71 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
358 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
44 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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1answer
53 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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0answers
30 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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2answers
78 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
138 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
213 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 ...
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0answers
236 views

Integrating Li-ion charging & protection on the same PCB, how to wire/ground properly?

I'm designing my first PCB in which I'd like to include a battery charging IC as well as a protection IC, with a focus on small footprint and low BOM. The trifecta that I came across quite often was ...
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1answer
42 views

AXP209 : Usage without ACIN?

I'm currently bulding and Android device and I've got a question which can't get answered. The AXP209 is an IPS and power manager. It allow the usage and charge of a standard lipo. It has two inputs ...
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1answer
448 views

TP4056 Lithium Charger cut off voltage [closed]

This module that I got from ebay has a cut-off voltage of 2.5V which is way too low. At that point your Lipo is probably dead. Anyone succeeded in increasing this to higher voltage? I would like to ...
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1answer
30 views

Trying to Find Minimum Output Capacitance

I am trying to choose an output capacitor for the TPS6107 boost converter. My circuit will resemble the example from the datasheet. Datasheet: http://www.ti.com/product/TPS61070/datasheet/abstract#...
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1answer
35 views

Output Capacitor Value

I am trying to choose my output capacitor for the TPS6107 boost converter. I am using the equation Io x D/ Fs x Delta Vout(Desired Output Voltage Ripple). I have found all the other values for the ...
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3answers
146 views

Micropuck LED driver gets really hot

I have a Cree LuxDrive LED powered by a 3.7V 750mAh LiPo Battery hooked up in a circuit with a latching switch. For some reason every time I turned it on, the driver gets really hot and almost starts ...
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1answer
186 views

what does built-in LiPo discharge protection look like?

I bought a 100 mAh LiPo from the b&H website because it specifically said that it had overdischarge protection. I really need a reasonable lifetime for this battery so I hooked up the battery to a ...
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1answer
434 views

TP4056 Heating While in Use

I am trying to charge a 3.7v 200mah 10c E-Cig battery with a 3.7v 380mah 25c Li-Po battery and a TP4056. For some reason my TP4056 is burning up when connected to the 380mah battery. I did some ...
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1answer
53 views

Discharging a Lipo

I'm experimenting with how fast you can discharge a lipo. I have an 2200 mAh battery. Its peak discharge is 100C. I hooked up some copper tubing to act as a resistor. Its resistance is 0.02 ohms. I ...
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2answers
100 views

What's a good discharge current for a LiPo battery without a C rating?

I have a raw (unprotected) 3.7v LiPo cell. It's rated 4000mAh. It has the markings "HRDC 14.8wh 3.7V 606090P 20170528". Apparently 606090 is a number commonly associated with this type of battery, but ...
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3answers
252 views

Shut off a low-current circuit beneath a certain voltage

I have a circuit that requires only 2mA of current. I need to turn it off when my LiPo drops below 3.5V. The LiPo is not at risk of overcharging, because the charging circuit is separate from this ...