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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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0answers
16 views

Graupner Ultra Duo Plus 80 TCS stops charging after few minutes [on hold]

I'm using brand new LiPo 1450mAh 7.4V 25C 10Wh batteries. Graupner is set to this: ...
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2answers
37 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
257 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
87 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
26 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
17 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
23 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
57 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
39 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
67 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
46 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
34 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 ...
0
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1answer
79 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 ...
1
vote
1answer
71 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
24 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, ...
0
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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 ...
1
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1answer
49 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
62 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 ...
0
votes
1answer
173 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 ...
0
votes
1answer
42 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
45 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
29 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
68 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
112 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
126 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
32 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
150 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
34 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 ...
1
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1answer
310 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 ...
0
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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
34 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
129 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 ...
0
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1answer
121 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 ...
0
votes
1answer
304 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 ...
0
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2answers
75 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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vote
3answers
169 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 ...
0
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1answer
41 views

Li-Ion vs Li-Poly For Quads

Instead of using a $25 Li-Poly battery with a $10 charger, I was going to use one of these- https://hackaday.io/project/46436-3-cell-rc-battery-pack-made-with-18650-batteries What I was wondering Is ...
0
votes
1answer
43 views

Can I use a battery protection circuit for a 3S 18650 with a LiPo 3S pack?

I am looking into getting a battery protection circuit for the 3S LiPo pack I am planning on using in my project. Max current draw will be 5-6A. Since I think it's more efficient to buy something ...
0
votes
1answer
171 views

Stepper Motors Calculations

I am currently working on a project for PV tracking systems. I have two stepper motors, one for each axis to track the position of the sun and the power generated would need to primarily recharge the ...
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3answers
150 views

What's inside power bank car jumper

All powerbanks that have car-jump function have some thingy between the clamps and powerbank socket: What's inside that thingy? The manufacturers typically claim 300A of starting current for ...
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2answers
161 views

Simplest way to measure 4 cell LiPo battery State-of-Charge during discharging

For testing purposes, I need to know an aproximate percentage of the battery charge in order to know when the battery must be recharged. It doesn't need to be accurate at all, p.e. a simple signal (...
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2answers
251 views

Selecting a logic level MOSFET compatible with 3.7V power source

Continuation of prior question: Logic level mosfet to switch on 3.7v battery I am a 'mature' entrepeneur Arduino level electronics noob, apologies. Want to build a flashing alert using 3W LEDs in ...
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1answer
67 views

Switching between 2 power supplies upon dropping below cutoff voltage efficiently

I am making a circuit which is powered by a lipo battery of 11.1V(3.7V*3). I need to check for the lipo's under-voltage so that the circuit automatically switches to a second lipo when the first one ...
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0answers
115 views

Simple under-voltage protection for 3 cell LiPo

I am building a circuit that will require the use of a 3 cell LiPo battery. In order to protect the battery I would like to include a simple circuit that cuts the power when the battery cells drop ...
1
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1answer
96 views

Wrong target voltage in Li-Po charger

What would be the consequences of using a charger that targets 4.3V to charge a 4.2V Li-Po battery? Will the battery be damaged? In what way?
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votes
1answer
46 views

Smartphone Fast Charger with Lipo and UBEC

I have a 3 cell, 11.1V Lipo and a 5V@3A UBEC that I am using to charge my Samsung S8+ with USB type C cable. This works fine, but my phone reports "slow charging" and takes about an hour to charge 10%...
1
vote
1answer
83 views

dangers of 1500mah LiPo

I have an electronic device that uses a 3.7v 1500maH LiPo battery and is encased in a poly-carbonate housing. I understand the dangers of LiPo in general, but the battery in question is not large ...
3
votes
3answers
214 views

What gauge wire do I need to connect a 3.7V 750 mAh LiPo battery?

I originally thought that I could use any type of thin wire, but after some research, it seems that different voltages and milliamps require different size wire. Am I correct with this? My question ...
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0answers
73 views

Can I connect a LiPo and a microcontroller to the same ground?

I am trying to power a circuit via a 3S LiPo battery while feeding this circuit a signal generated from a different circuit powered by USB. The signal for the LiPo powered circuit must have the same ...