Questions tagged [lithium-poly]

Lithium Polymer batteries

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18 views

Is it possible to increase the charging current of a TP4056 with a MOSFET for a LiPo?

I want to charge a Lithium Polymer battery at 6A - can I use a MOSFET to increase the charging current of a TP4056 by connecting it to the "Charge Complete" pin?
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26 views

How to increase charging current above 1A in TP4056 [on hold]

I'm trying to create a Lithium Polymer battery charger that will charge a high C-rating LiPo at 6A - I want to use the TP4056 for simplicity, but the idea of using 18 TP4056s to charge three LiPos is ...
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3answers
103 views

Charging a lithium battery to 4.34 V

I recently came across a device (a headlamp) with lithium-polymer battery, which is marked 3.8 V nominal voltage, instead of usual 3.6-3.7 V. It's charging circuit is based on ME4057D chip, which is a ...
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67 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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27 views

Charging multiple batterypacks in parallel

I am sorry if this questions seems kinda basic. I am currently working on a small project involving a bluetooth amplifier module requiring a minimum of 12v input. My idea was to use a ...
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84 views

TP4056 with DW01, can I use a diode to create an “UPS”? Design review

I'm studying lithium cells and their related mainstream modules. One of the most common -yet wrong- use of the TP4056 module is to use it with the USB 5V input and an active load on the output (at ...
3
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1answer
109 views

What would cause my eReader's battery to suddenly start smoking? [closed]

I was listening to some MP3 files on my eReader while shopping at a hardware store, looking at a power generator. I previously checked the battery's percentage and it told me that it was at 80% ...
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1answer
54 views

Does battery wear depend more on EMF voltage (capacity) or terminal voltage? (charging full slowly vs. charging fast)

Let's say there are two identical Lithium-Ion batteries. (is it any different for Ni-MH batteries?) One gets charged at 0.1C until the EMF voltage (which is capacity-dependent) reaches 4.3V. The ...
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2answers
41 views

How to check protection circuit in lithium battery

I've recently bought a single cell, 600 mAh lithium battery (like this one) and a TP4056 battery charger module, which I intended to use with the battery. The charger has an integrated protection ...
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3answers
474 views

How much do lithium polymer batteries expand in volume?

I'm designing a device with a small lithium polymer battery (4x12x30 mm, 120 mA-h). Looks like this: I've heard that there is a rule of thumb that the space left for the battery in a case should be ...
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0answers
75 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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1answer
173 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
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211 views

Solar Li-Po battery charger with MPPT algorithm

I'm new here but I have read a lot of topics here about my question. I am designing a solar battery charger with MPPT algorithm but I don't know if I am doing it well. First of all my specs are here: ...
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1answer
83 views

Relation between terminal voltage and charging speed in Lithium-Ion/Polymer batteries?

I tested charging a 5200 mAh (20 Wh) battery at 10W. Its charging level at the beginning was 20%. The terminal voltage was 3.68V. Now, I applied 10W of charging rate to the battery. The terminal ...
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2answers
131 views

What is the efficiency of a lithium polymer battery?

I noticed that when charging and discharging a lithium polymer battery, the incoming/outcoming energy I calculated is very near to the specifications of the manufacturer. How is that possible if any ...
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1answer
61 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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1answer
60 views

Charging and Using a Lithium Battery

I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
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1answer
133 views

Battery protection circuit

I’m trying to design a battery protection circuit for this 300mAh 3.7V LiPo battery. I’m an EE student which is designing his first pcb. Please forgive questions with obvious answers. My questions: ...
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2answers
61 views

Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...
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82 views

Best battery configuration: 1s1p vs 3s1p vs 1s3p? [duplicate]

I’m designing a product prototype using a single board computer (like a Raspberry Pi) that requires an 8-18V DC supply. It has to become battery powered, so I’m looking into the best possible ...
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2answers
550 views

Sourcing 3-lead 3.7v LiPo batteries

I'm attempting to source replacement batteries for some medical devices (digital goniometer, inclinometer, etc.) The markings are: GMB063048 3.7V 800mAh 2.0WH 2010.12.08 R I've found batteries of ...
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2answers
148 views

Constant Power Micro Load

I am trying to make a circuit that slowly discharges a multi cell lithium battery to storage voltage. I already have a comparator circuit that can turn on or off discharging. I want to support 2s to ...
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58 views

A cheaper way of Lipo battery charge and power switching

I have been reading stackexchange for last 5 days but could not see any proper / answered circuit / discussion about Lipo battery charging and backup and thus asking the question here. I am doing a ...
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0answers
40 views

Can lipo and Lithium-ion batteries be used together?

Lithium ion batteries have high specific energy and lipo have high c rating (high power). Is it possible to put lipo and lithium-ion batteries in parallel if they are at the same voltage and ...
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1answer
53 views

Batteries for Drones [closed]

I am making a drone for geological applications and for that we require a flight time of 1.5 hr without payload. Could anyone recommend any battery types of alternate power sources that I could use?
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2answers
441 views

Lithium Ion prolonged lifespan

According to the Battery University, charging a Li-ion cell to just 3.92v is the optimal voltage to avoid stress and lithium plating. Problem is, nearly all consumer chargers focus on going to 4.2v ...
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1answer
123 views

May I replace ICR 18650 22F with 26H in Laptop battery?

As in the title, I have a worn laptop battery, made out of 6x SAMSUNG ICR 18650 22F. Now I can't find any 22F near me, nor slightly farther for a sane price. But SAMSUNG ICR 18650 26H are practically ...
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1answer
923 views

Tablet battery voltage

I'm building a sort of homemade tablet out of a 10" touchscreen (designed for RPi-like devices) and an Asus TinkerBoard SBC. The SBC takes the standard 5V 2.5A power source, but the screen requires ...
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1answer
1k views

Charging Li-Poly Battery with Small solar panel

I have Li-poly battery that is 4.2V 2000mAh with a protection circuit. I have solar panel that is 5V 250mA. The aim is to charge the battery to maintain a fully charged battery, so it really ...
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104 views

Help with assessing maximum operating voltage of a circuit

I am designing a field charger for charging lipo batteries while I am out flying and on the go and I already have a huge 16000mah 4S lipo available that I could use to charge my 1300mah 4S and 2200mah ...
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3answers
289 views

Creating DIY ON/CHARGING switch for an Arduino

Currently I'm using the newly released WEMO LOLIN32 (pictured below), and it's a great board, save for the lack of one thing, a power button. Initially I was thinking of a simple ON/OFF switch that ...
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2answers
2k views

MCP73831 Li ion battery charger problem with load sharing circuit

I am building a device which is being powered by single cell Li ion battery (1100mAh), i am using MCP73831 Li ion battery charger and controller in my design to charge the battery. I am using below ...
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2answers
244 views

Is a battery management system necessary for wearables? [closed]

My team and I are working on developing a wearable device (like a heart rate monitor with IP68 dust/waterproofing) and we're utilising wireless charging for our 3.7V 350mAh non-removable battery. We'...
2
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1answer
57 views

Add li-poly battery to projects

I would like to upgrade my RC project, changing from common AA batteries to li-poly. I've chosen them because I always see them in RC planes/cars. My model would require 7.2/9V and a max instantaneous ...
3
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1answer
2k views

Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V ...
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1answer
598 views

Should I charge a 3.7 V 500 mAh battery with a 5.2 V mobile charger? [closed]

I don't have the Li-Po charger but the mobile charger I have outputs 1 A and 5.2 V. So should I charge it? I completely drained my battery by the way.
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1answer
48 views

Discharging a Li Polymer battery

I have a LiPoly battery (3.7V 650mAh, similar in size/shape to a standard AA) that was part of an e-cigarette assembly. While attempting to remove another part of the assembly, I accidentally ...
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1answer
7k views

Charging 3 cell LiPo with TP4056 (Protection included)

I am trying to charge my three LiPo cells with these TP4056 modules. My Idea: simulate this circuit – Schematic created using CircuitLab
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2answers
717 views

How to detect completion of Lithium-Ion charging

Is there a simple way to detect when a lithium-ion battery charging process is complete? I have a basic system as shown here: The load represents my application (including its own voltage regulation)...
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1answer
146 views

Lipo uninterruptible power supply?

How can you safely build an uninterruptible power supply with Lipo batteries? There are a lot of boards out there for connecting a charger to an external supply to build a UPS. However, all the Lipo ...
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1answer
119 views

Charging li-po battery with phone charger

I am planning to make automatic rechargable emergency led light (automatically lights up when there is a powercut). I scavenged led's from old emergency light. I planned on using this 3.7V 300 mAh ...
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1answer
156 views

Prevent Lithium battery discharge until USB/Charging voltage is present (for the first time)

I would like to prevent the battery in a device from discharging (initially) until the usb is plugged in (to keep charge on the battery during storage and shipping). I am using a typical LiPo ...
3
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1answer
436 views

3.7 to 5V Boost Converter Design Issue

I am an electronics hobbyist who has started dabbling in making circuit boards for my projects. I have designed and fabricated a board for a solar powered sign I am making. The sign essentially ...
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2answers
856 views

Lithium Ion Battery Capacity: Discharge Analysis

I have taken apart a battery module consisting A123 Systems ANR26650-M1A cells (they are technically Lithium-Iron-Phospate (LiFeo4) cells) that were used in a commercially controlled environment. ...
2
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1answer
93 views

Replacing Lithium batteries with larger ones

I have some background with electronics, but that was in the "old days", so my knowledge of lithium battery types and charging processes is very limited. I have a bunch of gadgets with one of those ...
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1answer
112 views

Rest time for testing lipo cells

My university's student electric racing team has to test a large number (250) of lipo cells before using them in our electric car. Our testing methodology will be approximately like this: Discharge. ...
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2answers
114 views

Can I convert L-ion battery backup to supercapacitor?

I have a RAID card in my home server and the battery went dead. It's a lithium ion chemistry with the circuits to tell the RAID card miscellaneous information. I could buy another L-Ion battery to ...
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2answers
952 views

Why MCP73871 lithium battery charger IC takes so long?

I'm working on a Microchip IC: MCP73871, a very small linear charger for lithium-based batteries. It has very nifty feature: a load-sharing system that gives priority to the load over the battery in ...
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1answer
275 views

Trouble Driving a Solenoid with a LiPo Battery

I am having trouble getting enough current to drive a bi-directional solenoid with two leads. I am using a half of a L293 (Quadruple Half-H Driver) to drive the solenoid back and forth. The solenoid ...
3
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1answer
5k views

How many battery cells in a smartphone?

Are most batteries built into smartphones (e.g. iPhone) single cell batteries? If so, why might that be?