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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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Connecting multiple Li-Pos, each with a separate BMS

I have some 3.7v Li-Po batteries, each has a welded BMS, and they're all the same capacity. I need to connect them to get 11.1V and also be able to charge it. Would that be possible, or the BMS will ...
Michael's user avatar
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32 views

Problem estimating LiPo battery life for powering BLDC motors

I'm trying to estimate the battery life for a system powered by a pair of LiPo batteries, in which the main loads are two BLDC motors. I estimated the battery life by dividing the battery capacity by ...
SkepticMind's user avatar
1 vote
2 answers
110 views

ESP32 PCB Review [closed]

I am currently designing a PCB to be manufactured. This version is my attempt at a working prototype. I am new to PCB design but am open to accepting any help I can get! My part is meant to function ...
AmateurEnthusiast's user avatar
0 votes
2 answers
159 views

How to correctly power an ESP32-H2 board with a battery

I'd like to power my ESP32-H2-DevKitM-1 board with a 3.7 V, 2000 mAh Li-po battery. For this I think I must use this pin: Battery-3V3 The above picture is from the Pin Layout section of the ...
Laboratorio di Robotica e Mecc's user avatar
0 votes
1 answer
68 views

LiPo charger with load sharing

I'm trying to make a LiPo charger + load sharing module that is mostly based on the popular TP4056 charger modules, this is my schematic: I've made the prototype and the charging and protection part ...
Razero's user avatar
  • 199
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2 answers
145 views

Can I charge my 3S2P 18650 battery (12.6v) with a normal 12v power adapter if I use a BMS with built-in balancing+protection? [closed]

First off, I would like to stress the fact that I am no electrical engineer or anything of the sort, just a hobbyist that is into this kind of stuff. So please bear with me, as I know a few things ...
Respoda555's user avatar
0 votes
2 answers
88 views

Can I safely operate a DC motor at 40% higher voltage than nominal?

I'm aware that you can power a wound motor (DC or even stepper) if you limit the current inside the coils. You cannot just apply a higher DC voltage to them. I'm using a DRV8871 to control a VN-C1 ...
Mark's user avatar
  • 1,235
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38 views

Modifying Li-po and NiMH batteries

I have three 2s 7.4V LiPo batteries, two balance LiPo chargers that can charge 7.4V/11.1V 1s-3s batteries, and soldering tools lying around, so I'm wondering: Can I convert the three 2s 7.4V batteries ...
Beachy Boys's user avatar
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0 answers
29 views

How best to charge a 120 V series assembled Li-po?

I purchased ten 12 V, 30 Ah batteries to be run in series up to 120 V. The problem is that they each come with a 12 V, 3 A internal BMS. I assume I must disconnect their internal BMS as the combined ...
Nick D. 's user avatar
1 vote
2 answers
52 views

Do I need a buck IC to get 3.3 V, or a buck/boost, or an LDO?

The voltage supply of my FPGA and sensors circuit is 3.3 V. If I use a Li-po battery with 3.7 V nominal voltage and 3 V discharge cut-off voltage (the LP-803860 3.7 V, 2000 mAh with PCM), do I need a ...
NihelKh's user avatar
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3S LiPo Battery charging for Raspberry Pi robot project

The Project I have build a Raspberry Pi based robot with a RPi Camera to help me learn about computer vision and obstacle avoidance. It is powered from a 3S LiPo Battery that sends its power to a DC-...
SaltySparks's user avatar
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0 answers
21 views

Power distribution PCB and Li-po batteries

I am hoping to work on a project over the summer and it requires a decent bit of current. I ended up going with two 7.4 V, 5400 mAh batteries and I was planning on running them in parallel. With this ...
msalaz03's user avatar
2 votes
2 answers
150 views

Battery life of Li-Po battery if it is under constant charging

This question is to clear my confusion because I cannot find a logical answer. Say a vehicle is installed with a vehicle tracker ...
Awais Saeed's user avatar
3 votes
2 answers
356 views

Powering a Raspberry Pi Zero with a Li-po battery

I want to design a circuit to power a Raspberry Pi Zero using a single-cell Li-po battery (3.7 V). I'm working on a portable hobby project that's required to be battery powered and allows recharging ...
Amir Rachum's user avatar
4 votes
1 answer
309 views

Hall-effect sensor PWM jitter from switching converter

I am designing a circuit to power two magnetic sensors using a Li-po battery (nominal voltage = 3.7 V), DC-DC boost converter, and then either an LDO linear regulator or a buck converter to generate a ...
rtx_q505's user avatar
0 votes
0 answers
35 views

Li-po battery: determining compatibility for replacement battery and charger

I want to find substitute batteries for a pair of heated boots (heating element in the boot sole) with larger battery capacity for longer operating time. The boots came with two 8 V, 2600 mAh ...
pete's user avatar
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31 views

Voltage drop in Li-po charging circuit based on MCP73871T

I created a schematic including a Li-po charging IC MCP73871T and a boost converter powered by USB 5 V. The switch can alternate the boost voltage output between 9 and 12 V. Problem: 12 V state: The ...
Tom's user avatar
  • 21
1 vote
1 answer
85 views

Can I use a single battery charging ic to charge two batteries in parallel?

I am making a wearable device so for better space distribution I would like to use two smaller batteries instead of a big one. I've been using TinyCircuits's ASR00007 (290mA, lipo) battery which has a ...
Richárd R's user avatar
1 vote
0 answers
48 views

Issues with AP9101C Lipo protection IC and the auto-wakeup feature

I'm developing a pcb for a product powered by a single-cell li-ion battery. Since I couldn't find an appropriate battery with a built in protection ic, I decided to add one to my design. After ...
Marcel Król's user avatar
2 votes
1 answer
66 views

High voltage at the Schottky's anode terminal (Hobby Li-Po charger circuit)

I'm pretty new at hardware side of things and trying to teach myself circuit and PCB design just as a hobby, so. bear with me if I'm annoyingly noob for you. As a relatively simple first task, I ...
reo's user avatar
  • 23
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0 answers
64 views

LiPo Battery management circuits

I am new to creating PCB designs for specific projects and I essentially need someone to help me verify if what I have done is correct. The power source is a USB-C connection supplying 5V to the ...
Nicroxio's user avatar
0 votes
2 answers
119 views

Charging LiPo Battery with Solar Panel and Water Turbine Generator

I'm looking for a way to be able to connect a Solar Panel (5.5 V / 540 mA) and a Water turbine generator (3.3 V / 120 mA) together to charge a LiPo Battery of 4,000 mAh. While using the solar panel ...
Christopher Khawand's user avatar
1 vote
4 answers
138 views

Can you power 2 voltage rails simultaneously using a buck-boost converter?

I am designing a custom PCB and want to power 2 rails: a 3.3V and 5V rail, with a single 250mAh LiPo battery (3.7V) and need the 5V rail to have as stable a voltage as possible. I understand that a ...
rtx_q505's user avatar
1 vote
0 answers
110 views

Use 2s LiPo Battery as Battery Cell for Microcontroller

Is there a convenient way to use a large 2s LiPo battery (such as this one) as a power source for a microcontroller and LED strip? Specifically I'm looking for the ability to seamlessly switch between ...
ashbygeek's user avatar
  • 111
8 votes
2 answers
1k views

Power bank or fire hazard?

I do have a bunch of 18650 LiPo cells, salvaged from various sources. Now, I happened to come across a variety of power bank cases on Amazon which mostly look like this: Even a cursory look tells me ...
Florian Echtler's user avatar
0 votes
0 answers
38 views

Inquiry Regarding NTC Selection and Placement for ST L6924D LiPo Battery Charger

I am planning to create a lithium-polymer (LiPo) battery charger using the ST L6924D charging IC. Could you kindly recommend an appropriate NTC (Negative Temperature Coefficient) for controlling ...
Atrahasis's user avatar
  • 185
1 vote
2 answers
89 views

MCU not powering off completely

I implemented this on/off circuit that I use with a LiPo battery and a HT7833 voltage regulator. Since my MCU (ESP8266) can only handle 3.3v, I added a voltage divider for the MCU sense pin, just like ...
ruben's user avatar
  • 33
0 votes
0 answers
56 views

2-S or 3-S USB type-c PD LiPo battery charger

I am trying to implement a 2-S or 3-S USB type-c Power Delivery (USB-C PD) battery charger. I am using this video of reference which uses a 16pin female usb type-c connector (part: TYPE-C-31-M-12) and ...
imt_blake's user avatar
  • 441
0 votes
0 answers
40 views

Replacing lipo battery with a power supply

For a project i'd like to power a brushless motor that works with esc and lipos but i need to replace the lipos with a power supply so the motor can run longer, i need 50v and need to be able to pull ...
mat gof's user avatar
1 vote
1 answer
88 views

Is it possible to use BQ25629 as both a lipo battery charger and a stable output regulator?

I am a bit confused looking at the datasheet for the TI BQ25629 with regards to the SYS output voltage. Essentially, I have a 3.7 nominal voltage 290 mAh lipo battery that needs to provide around 100 ...
tronhawk's user avatar
  • 229
0 votes
0 answers
37 views

Can we charge a 12S LiPO battery through a DC safety switch?

I'm working on a robot that uses a 12S battery as its main power source. The problem is that wanted to add a short circuit protection and an overcurrent protection, so added a DC automatic safety ...
Mito's user avatar
  • 411
0 votes
1 answer
73 views

What is the purpose of N channel MOSFET in this schematic?

I have a developement board and I have found the schematic of it. However, When I skim through schematic, I came across this charger and boost circut but I couldnt figure out what is the purpose of N ...
enis's user avatar
  • 73
0 votes
0 answers
50 views

Charging a super cap with a Li-po battery while maintaining charge

I have a 3 V 100 F capacitor and 400 mAh 35 C battery, the battery is to be charging the super capacitor and maintaining charge until a button is pressed to discharge the super cap. I am stuck with ...
roaibrain's user avatar
  • 407
1 vote
0 answers
31 views

Auto power switching between USB and a range of Lipos (1S-3S)

I'm designing a circuit used in a portable device. I want the option of powering the device over USB or from a range of different Lipo batteries (1S-3S). I want the circuit to auto negotiate between ...
Fireflash's user avatar
1 vote
1 answer
70 views

Can I use a MAX17262 to measure battery capacity of a 300mA 3.7V Lipo?

First, I a very basic understanding of lithium based batteries and from what I have learned, gauging their capacity can be quite complex. I was looking into MAX17262 as a fuel gauge to measure the ...
tronhawk's user avatar
  • 229
0 votes
1 answer
73 views

Safely Switching between LIPo batteries

I run two 12 V LiPo starter batteries in my race bike. They only power a starter motor and the ignition in a total loss system. They are rated at around 10 Ah each and are different brands. They are ...
Rick 's user avatar
0 votes
1 answer
76 views

Reverse voltage protection for four 18650 cells

I would like to protect my robot from reverse voltage which is powered by four 18650 cells. Is option 1 sufficient or do I need at least three diodes? I know that using diodes comes with a voltage ...
Michael Brown's user avatar
0 votes
1 answer
163 views

Powering a dc brushless motor with lipo battery

I am trying to control a brushless dc motor. I have a H-bridge style MOSFET circuit and am controlling the gates with an Arduino. However I am trying to power the motor with a 7.4 V lipo battery (...
io19's user avatar
  • 11
0 votes
0 answers
72 views

How can I increase the capacity of a 3.7V lithium polymer battery?

I have a Raspberry Pi Pico W that I want to power using a battery. All the 3.7V lithium polymer batteries I can find are up to around 5000mAh which doesn't power the Pico for too long. Ideally I want ...
Josh Cronin's user avatar
1 vote
2 answers
175 views

Can I power a circuit from the balance cable of a lipo battery?

Hello I want to power a circuit (that runs at 3.3v) with the balancing cable of a 3s Lipo Battery, my plan is to use only 1 cell through an LDO to power my circuit. My question is can I power it ...
Rafael's user avatar
  • 13
3 votes
1 answer
108 views

How do you create small devices that can remain "dead" for a very long time without damaging the battery?

I'm working on a product that uses a very small 20mAh lipo battery. The device only needs to operate for 8 hours, and that's not a problem. However, I expect that customers may run the device until it ...
Drew's user avatar
  • 7,119
0 votes
0 answers
52 views

The most minimalistic solar charge controller possible: will it work?

I want to build a solar panels device that can supply power to my doorbell, which is installed over a gate with no access to wires or power. The gate has a "bar" on top where I can install ...
Filippo Possenti's user avatar
-1 votes
1 answer
62 views

Can I use this battery for my circuit?

I plan on having a circuit that connects a 3.7v Lipo battery to a 1.4 ohm coil. However, I just saw this table for the battery I am using and noticed it has a max discharge of 0.4A Does this mean I ...
Michael Rutkowski's user avatar
0 votes
1 answer
53 views

Do camera batteries require a seperate protection circuit (lithium accu 1s)

I have a lot of old camera batteries lithium 3.7 V rechargeable accus (1s), because such handheld cameras keep dying due to lens failures (lots of sand and wind here). I want to be able to reuse those ...
TeD van Loon's user avatar
0 votes
2 answers
85 views

ADC is not correctly working

I build this schematic that was recommended to me in this thread: My entire schematic then would be: And this is how it looks on the PCB: If I attach a 4.15V battery, the differential between VIN+ ...
Cem Pamir Bana's user avatar
0 votes
1 answer
669 views

Lithium Battery Protection DW01

I'm using DW01 to protect LiPo batteries. But since there are more than one source of voltage in the circuit, I need to add a diode to DW01's VCC pin for the situations that battery is removed and ...
AKTanara's user avatar
  • 291
3 votes
2 answers
305 views

Read battery voltage with ADS1110

I have an ADS1110 that should read a battery's voltage (2.8V - 4.2V). I have built this schematic: The problem is, I connected the battery's negative terminal to VIN- and the PCB is already assembled ...
Cem Pamir Bana's user avatar
0 votes
1 answer
306 views

Lipo battery not holding charge

I have a DAB radio which has a 7.4 V 2000 mAh LiPo battery which recently stopped holding its charge. I purchased a replacement battery, 7.4 V but 3000 mAh. The old battery had a single 3 wire ...
Alan A's user avatar
  • 209
2 votes
2 answers
615 views

Behaviour of my Battery Management System Schematic

I am trying to validate my schematic of a battery management system based on the DW01A for single cell protection, I have 3-series (3-S) Li-Po cell battery pack so I am using three of this integrated ...
imt_blake's user avatar
  • 441
1 vote
1 answer
440 views

What is the difference between PACK- and BAT-?

I have a doubt about what is the difference between BAT- and PACK- in this battery management system available in a github project: As I read in the datasheet of the BQ76920, the N-Channel FETs are ...
imt_blake's user avatar
  • 441

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