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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1answer
21 views

Charge LiPo battery with protection directly through dev board

I am just buying some LiPos (3.6V) and charging circuits for a project. The batteries come with overheating, over-voltage, over- and undercharging protection circuitry. In the reviews, someone ...
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1answer
33 views

Can I safely replace flat Lipo battery with a Li-Ion round battery pack on a constantly powered device?

I did some research, but didn't find the exact situation. I have a device that has a battery inside and is powered by a 5V 4000mA USB-C charger. The device requires the battery to be connected at all ...
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3answers
100 views

Solar panel not charging LiPo Batteries

I am a totally beginner in electronics and I am facing a big problem with my prototype. I am trying to create an autonomous circuit that runs an Arduino powered by a 3.7 LiPo battery. The problem that ...
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0answers
26 views

PSU charging / USB charging with data transmission - LiPo cell

I am designing Rev.2 of my Geiger counter trying to squeeze in more functionality in it and make it portable. I decided to go with single LiPo cell 3.7V, STM32 microcontroller and step-up converter 5V ...
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0answers
20 views

Two IP5306s one Battery

I have a circuit which provides power to an SOC and charges a battery when needed. For this, I have chosen to use two IP5306s. The reason I use two of them is because of the "feature" it has ...
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1answer
32 views

LiPo 18650 cell TLC

When I look at 18650 LiPo cells with in built cell protection (either the small disk type fitted to the top of the cell or the side mounted ones with a straps that that run to the battery top & ...
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0answers
47 views

LiPo battery sparks when used with DC step up convertor

I'm using a LiPo battery 700mAh 3.7V with MT3608 DC-DC step up boost converter module 2V-24V 2A. The problem is when I connect these to anything or even the wires just touch each other they produce a ...
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1answer
37 views

Power Raspberry Pi3 with regulators [closed]

I want to power my Raspberry Pi3 with an LM2596HVS regulator module which gets its input from a LiPo 3 cell battery. Is there any risk of damaging the Raspberry Pi?
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1answer
1k views

Is this MOSFET upside down?

I'm looking at existing circuits and trying to understand them so I can design my own. Also to improve my electronics knowledge, for some reason MOSFETs have never quite sunk in for me. I came across ...
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2answers
31 views

How does the TP4056 overdischarge protection work?

I want to buy this integrated circuit (IC) to charge li-po battery. TP4056 Type-C 1S 3.7V It looks nice for charging but I am afraid of the overdischarge protection of this IC because in the ...
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1answer
82 views

My LED driver keeps blowing up when connected to a Lipo battery

I bought this LED driver for my Cree XHP70.2 LED The driver specs are: Input voltage: DC7V~15V Output voltage:DC6V Current: 4-4.5A Single mode full power I connected the driver to a power generator ...
5
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1answer
325 views

Block battery if USB is plugged in

I'm building a battery powered device and I want to make sure, that no current is drawn from the battery, if USB is plugged in (while charging). I know that I could solve this with two diodes, but ...
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0answers
43 views

Resistor value to discharge the battery

I had a LiPo battery with specifications of 14.8 V, 2200 mAh, 23.6 Wh with 25 C rating. Can any one tell me how to calculate the resistance value. Current= 25C x 2.2 A= 55 A Power P = VI = 14.8 V x 55 ...
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0answers
30 views

Arduino Every Nano with 3.7V Li-Po - Reading voltage

I have Arduino Every Nano and 3.7V Li-Po battery (Akyga LP903759). I want to read the current voltage of a battery using analog pin. If I use a 50 kOhm and 200 kOhm resistor (in voltage divider) I'll ...
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2answers
66 views

How to make a solar battery charger using more than 1 Lithium polymer

I have atleast 5 lithium polymer [not 18650] batteries taken from laptop. the print on them is pale, it is 14.01wh [ 6 cell 6 x 14 = 84wh, but i split each battery now] it is 3840mah each. I would ...
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1answer
38 views

TP4056 reference design 1R resistor function

From the datasheet of the TP456 li-po charging chip, a 1R resistor is added in series to the 10uF capacitor. I am assuming the capacitor is for signal conditioning. But why is the 1R resistor added? I ...
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1answer
45 views

Constant current driver and undervoltage protection for lipos

I'm searching for a way to drive a couple LEDs with a single-cell LiPo battery, such that the LEDs will be cut off completely when the LiPo voltage drops below, say, 3.3V. PCB space, component count ...
3
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1answer
64 views

TP4056 battery output (charging voltage) is not constant

I tried to design a charging circuit based on the TP4056 li-po chip. At a usb voltage of 5V, the battery charging output (Pin 5 of TP4056) 4.3V. This seems acceptable, but there seems to be no ...
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4answers
286 views

Understanding working of MPPT charger

I am trying to understand working of MPPT charger for LiPo battery (3.7V nominal) and 6V 2W solar ‎panel so that I can select right charger for my project. After searching and reading lot of related ...
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0answers
38 views

Can you use LM5117 as a CC/CV LiPo charger for a 1mAh LiPo cell?

I am trying to build a LiPo charger for a custom 1mAh LiPo cell. The cell is rated for charging with 0.5C, so 0.5mA max charging current. I cannot find any off-the-shelf ICs that can charge with such ...
3
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2answers
58 views

Can a bad USB-C PD charger puff up a battery?

I have a notebook which supports USB-C PD charging. I've been using 3 chargers that I have. The battery that came with the notebook (original) puffed up after about 1 year of usage, but I didn't seem ...
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3answers
105 views

LiPo charging circuit to supply 1mA peak current, to charge a custom 1mAh LiPo cell

I am searching for a schematic or design that would help me charge a very small 1mAh 3.7V LiPo battery. I've done a pretty thorough search and the closest off-the-shelf IC I can find provides 10mA ...
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3answers
68 views

Does a boosting circuit reduce battery voltage without any load?

Suppose I am trying to boost the voltage of my 3.7V Lipo battery to 8V using a boost converter (MT3608 module) and lighting up some LEDs. Does the voltage of the battery reduce just because of the ...
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3answers
73 views

Resistance effects on LED when connected to battery

I have this doubt whether to go with theoretical method or practical. Lets say I'm using a 3.7V battery 350mAh to light up a LED which has forward voltage of 3.3V (which means LED lights up if 3.5V is ...
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1answer
28 views

Insulating JST-PH solder points

Shown in the image are the solder points corresponding to the two terminals of a JST-PH connector. (Jumper is there as a size reference). They are way too close for comfort for me, especially with ...
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0answers
39 views

Voltage And Current Leak into My Electronics Design Prototype

I designed & build a circuit/PCB to control a 5V PWM PC fan on Autodesk Eagle. It's based off the Arduino Leonardo platform (ATMega32U4). The PCB is made by JLCPCB and I soldered on the components ...
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2answers
28 views

Is charging current shared between Separate LiPo batteries wired in parallel?

I have two separate 2000mAh LiPo batteries (not RC type the standard 2 wire DIY component type https://coolcomponents.co.uk/products/lithium-polymer-battery-2000mah) Which I want to wire in parallel ...
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2answers
77 views

Wireless charging Lipo batteries

I found this discussion while looking for a way to wirelessly charge my 3S drone battery. I would like to find a way to drop my drone on my desk (like I do my phone) and let it charge. If I am ...
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1answer
58 views

2S 10C LiPo 6000 mAh step-down to 6V

There are a ton of buck converters that can step-down 7.4V to 6V. But looking at their specs, all of them can't seem to handle the typical LiPo high current discharge rate of say 60A. Is there ...
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1answer
29 views

Does a LiPo balancer board need switching for external power supply

I have 4 18650 LiPo batteries in a battery holder that I am connecting a to a charging balancer. According to the description it comes with charge protection and does proper balancing for the 4 cells. ...
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1answer
76 views

Establishing Safe Operation Range for Lipo Battery with Buck Boost Converter

I have a circuitry that I need to power up with lipo battery. I need to regulate battery to 3.3V with buck-boost converter, since LDO can not be able to provide required current output and causes ...
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1answer
55 views

How to boost my Lipo battery automatically when connected to a load?

Ibam using a Lipo battery to boost the voltage from 3.7V to 10V using a MT3608 module. Since the MT3608 module always boosts the voltage no matter if I connect the load at 10V. Is there a way where ...
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2answers
61 views

Does boosting voltage using MT3608 from 3.7V to 10V module reduces the Lipo battery capacity?

Suppose say, Iam trying to boost the voltage of my 3.7 Lipo battery to 10V using MT3608 STEUP UP CONVERTER and I need to run 3 LEDs(connected in series) which takes 9V (3v for each LED) If my LIPO ...
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0answers
46 views

What connector type is this?

I recently disassembled a broken Motorola G5+ and saved the battery, vibrator motor, and main circuit board for whatever I wanted to use it for. Now I'm ready to use it, but need to find a connector ...
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1answer
30 views

Should there be a clearance between a lithium polymer cell and a charging circuit?

I'm building a compact portable console that is going to use a 500ma charger board from Adafruit and possibly a 5v 1a boost as well. Past experience has taught me the chips on those little circuit ...
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1answer
28 views

LiPo LED/Fiber job not working correctly after plugged in

I'm putting LEDs and fiber lighting into a ship model. There's not a ton of room, but I found I could fit two LiPo (3.7v, 2400mAH, DTP 605068) Batteries in series with a single two-prong connector. ...
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0answers
33 views

Is it safe/possible to add a BMS board to a soft pack 3s1p LIPO for charging and discharging?

i would like to make a 12V battery pack from a soft pack LiPo which can supply 10A for my projects which i can charge from a 12.6V DC wall powersupply. I dont want to use an external big special BMS ...
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0answers
37 views

How to tell a battery is LiPo or Li Ion (based on apperance)?

I have this battery and I don't know it is lipo or li-ion: Is there any way to tell a battery is lipo or li-ion based only on apperance?
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0answers
26 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
28 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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2answers
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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2answers
45 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
152 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
50 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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0answers
38 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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0answers
28 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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0answers
71 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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4answers
128 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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2answers
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
57 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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