Questions tagged [battery-charging]

Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

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0answers
33 views

How can I control time of day at which battery discharges? [closed]

I am trying to find a programmable controller (something like an Arduino maybe) to specify/control the time of day at which a house powering battery is to be used, while it remains unused for the ...
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2answers
45 views

How do I match a battery pack voltage to my solar panels?

We're building an autonomous boat which should be powered by solar panels. We want to put two 100W solar panels on it. Most panels I see are 18V and for redundancy we want to link them in parallel. ...
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2answers
27 views

Is there a relationship between voltage and State of Charge of a NiCd battery?

When a NiCd battery is charged, it can go above it's nominal voltage per cell of 1.2 V, typically up to 1.5 V per cell. How fast does this voltage go down to its nominal voltage if no load is ...
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23 views

Is backfeeding BD9C601EFJ buck converter IC a problem?

So I've got a circuit like that [Values are completely random, I didn't set them yet, the question is only about topology]: The circuit is intended to charge a 2S battery through F3, however when the ...
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1answer
72 views

Portable battery charger: how can I recharge the batteries without direct connection to my home electricity?

I'm working on a smart watering system for few flowerpots I have in my balcony. My main problem is that I don't have electricity output there, so I'm trying to think of a way to power my Arduino with ...
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1answer
87 views

Paralleling of battery chargers

Can we parallel the bbattery chargers suppose buck controllers.Two buck controllers taking power supply from the same power bus. The output of each controller will charge the batteries connected at ...
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17 views

Typical voltage range for a LiFePO4 BMS

I'm about to hook up some LiFePO4 (32650) batteries to solar panels. I bought a couple of noname BMS boards ("HX-4S-F30A") for a 4S configuration for the batteries online, and the ...
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1answer
86 views

What does this MOSFET do in this voltage regulation circuit?

In the below schematic, V_USB is connected to the +5V of a USB jack, that the user can plug and unplug. There is also a backup LiPo Battery, whose positive terminal is represented by V_BATT. From my ...
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2answers
117 views

How are a Tesla's batteries charged below 0degC

According to this link, charging a lithium ion battery below freezing temperature can damage it. How does Tesla manage this problem? I assume they have a solution since they sell their cars in ...
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0answers
54 views

how to charge 2S 18650 from one usb-c port? [closed]

I have two 3.7V 9800mAh (but since it's fake, let's say it's 4000 mAh in the most ideal case) 18650 li-ion cells. Putting them in a 2S battery tray, I get a 6.6V up to 8.4V battery. I'd like to wire ...
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1answer
91 views

I need to add a UPS to my power supply circuit

I am working on an ongoing project and now have the need to add a UPS or battery backup that will allow our controller to begin a shutdown safely when the power is removed. Yes I know there are plenty ...
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36 views

how to properly make a charging circuit handling 2s 7.4V to 5V 2A [closed]

I have 2 18650 li-ion cells, each at 3.7v and this bay with this white connector I saw on youtube that depending on the length of the cell, we can know whether they have integrated "invisible&...
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58 views

Charging battery with a tiny coil and magnet

I am working on a chip design which will be used to track small fish (about 5 cm), so the chip has to be very small too. A big challenge is the energy supply. I will probably use a proven design for a ...
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3answers
80 views

Why are laptop/smarthpone chargers not smarter while MCs are dirt cheap and the demand is there? [closed]

This question might be a better fit for superuser.SE Assumptions: some microcontrollers are dirt cheap Lithium-Ion batteries love being charged to to 50-60% of maximum (== degrade the slowest) there ...
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0answers
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USB Type-C to Type-C Cable has voltage in one orientation only

I'm designing a battery powered device, which gets charged with 5V. I wanted Type-C as the charging interface, so I designed an appropiate Type-C Port for the device: As you can see, I added the ...
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1answer
42 views

Finding a solution to make a decent batterypack, that I can install and charge/discharge without having to remove it

I have a problem with a power delivery circuit for my bluetooth speaker I am planning to build. I am unable to find a BMS for 4 Cells that would allow me to charge and discharge it through different ...
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Why does BMS not output voltage?

I am testing the following BMS: https://www.aliexpress.com/item/4000440971229.html?spm=a2g0s.9042311.0.0.d18d4c4dymCgkS I have wired it accordingly, however, there is no output voltage. I've checked ...
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1answer
70 views

Can we charge a battery rated at 42V 1A using 12V 1A charger?

So assuming that the battery is fully dead, is it possible to charge abattery rated at 42V 1A using 12V 1A charger. I have seen similar questions that are almost using same volts or slightly higher, ...
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28 views

Series 2 Charger Module to Charge 2Cell Li-ion Battery

So for a portable project, I will be using two lithium ion 2200mah 3.7v batteries in series to give me 7.4v. I have two 3.7v Lithium Ion charger found here https://www.adafruit.com/products/1905 . The ...
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1answer
59 views

Battery charger DIY

Can I use 220-12 V, 1.5 A stepdown transformer along with 12 V 2 A (KBP200) bridge rectifier to build a charger for 12 V, 7.5 Ah battery or should I use transformer with higher output, maybe 15 V?
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1answer
63 views

Building 3s 18650 battery pack

I got myself scrap laptop batteries for very cheap, only 2 cells out of 60~70 appear to be damaged (0v) To charge 2 drained batteries, first I used a powerbank circuit that despite being less than a ...
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1answer
34 views

Cell balancing of two batteries connected each at the output of parallel converters

I am developing a scalable energy storage application where I connect bidirectional dc dc converters in parallel and battery is connected at output of each converter. I am uploading a block diagram to ...
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0answers
27 views

Electric Scooter Battery charging issue

I recently bought a second-hand electric scooter for the wife (for those interested it's a Rascal 588XL-S, around 10 years old). The person I bought it off said the batteries were around 11 months old,...
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Charging 18v Ni-CD battery pack with DROK voltage regulator

I have an 18v 2000mAh black and decker drill battery that I want to charge and use in the mean time while I wait for a proper charger to arrive. I have a DROK Voltage Regulator/Buck converter (https://...
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2answers
120 views

Why should I put a Schottky diode and a resistor between a USB connector and a TP4056 charger IC?

I've found this useful explanation for a load sharing circuit based on the established TP4056 charger IC: LINK: https://www.youtube.com/watch?v=T70mBHeIOZA&ab_channel=WellDoneTips SCREENSHOT: Now ...
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0answers
36 views

Custom 18650 lithium ion charger using PWM to control output current - is it safe?

I am trying to design a custom charger for 18650 lithium-ion battery in 4S configuration. Custom in the sense that it could be programmed to vary its output current. The goal is to build a charger ...
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2answers
50 views

Li-ion battery drawing too much current

I have a 11.1 V Li-ion battery pack that I use for a 9-12V device as backup power. When I charge the battery pack, it draws 1-1.25 A of current from the DC charger which has caused more than 1 charger ...
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1answer
42 views

Amps and AmpHr? [duplicate]

What's the difference between 7Amps and 7AH, can someone give a simple explanation? Every answer I find is not helping me, for a beginner how do you explain this?
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0answers
37 views

Switch off device when battery is charging

I need to disconnect the rest of the circuit when battery is charging for safety reasons. I use a LiPo battery which it's charged with an IC that is powered by 5V DC thought a micro USB connector. ...
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1answer
62 views

Can I power multiple devices from one output of a power supply?

I am working on an LED project so I need to buy a power supply for powering some ESP32s and some LED strips. During my research I saw Philips Hue's 3 output adapter, with which if you want to power ...
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1answer
23 views

Ericsson NiMh battery - Klintland CF1330B

An old Ericcson GH388 uses a NiMH battery pack (Type 3008) On the back of the battery, there are 3 contacts, named (+), (-) and (T). While trying to change the battery, I noticed that the flexible ...
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2answers
71 views

How to connect four 18650 batteries to double voltage and capacity

Im trying to do a DIY RC car with uses two 6-12v motors as well as some LEDS, servos and Arduino components. I was planning on using four 3.7v 2600MAH 25A 18650 battery cells, two on series and two on ...
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2answers
73 views

I'd like to know if my own version of a cell balancer will do the job

I have two 3.7v cells in series to make a 7.4v battery. I want to make my own active balancer because I don't have access to buying any cell balancers. I'm using a transformer with 2n turns on the ...
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37 views

Using battery charge port as normal power

So I'm designing a battery charger circuit. It has two connectors in, a main power source and then a powerbank can be connected through a USB C port. I understand that there are various IC's to handle ...
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1answer
77 views

How to use 18650 batteries and increase voltage from 3.7v to 12v

Im trying to do a DIY RC car with uses two 12v motors as well as some LEDS servos and Arduino components. I was planning on using two 3.7v 2600MAH 25A 18650 battery cells on parallel to have a bigger ...
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2answers
88 views

Can we use a capacitor with battery to fast charge it?

Consider this. Many capacitors connected in parallel to an input line, those capacitors are in series connected to battery. Whenever we need to charge, we plug in adapter that charges the capacitors. ...
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0answers
35 views

Will there be any issues connecting 2 loads to a single DC power supply?

I am working a project that involves 2 loads, a battery and an electronic DC load. The battery is connected to a charger which allows a power path from the battery to the DC load when the battery is ...
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1answer
68 views

Using 19v laptop charger to charge 4S 18650 battery pack [closed]

I am manually assembling an 18650 4S battery pack for use with an inverter/ups. My goal is to build a portable inverter based on 18650 batteries (around 20AH capacity) which has the provision for ...
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0answers
27 views

Laptop's removable battery has 4 18650 3.7v cells in series, can I attach 8 more as external battery pack as 4s2p?

I have 4 years old HP gaming laptop with removable battery. I never kept the battery in the laptop. Right since the purchase, I stored the battery in a sealed pack in cold place, and charged it to 45% ...
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1answer
36 views

3S Lithium-Ion power solution for a project

I have a PCB that runs on 12V throughout the day and consumes 2.3A. The power is supplied for 12 hours using a power supply. The other 12 hours it must run on batteries that have charged during the ...
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0answers
104 views

Adding an adjustable constant current option to a LM5175 circuit

Disclaimer: I'm no electronics engineer and I have no experience in this kind of circuit! I do occasionally design simple analog circuits and PCBs, barely messing with opamps. Context: I'm about to ...
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0answers
39 views

USB charger for Li-ion batteries

I'm designing a PCB for charging single-cell Li-ion batteries via USB. Hereby, charging via USB from a computer and from a wall adapter should be supported. As a charger IC, I consider using the ...
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3answers
88 views

How to know if the li-ion batteries are fully charged?

As much as I know if your li-ion cell is providing 4.20V then it is fully charged one. But when I bought a pair of new ones they were at 3.9V each and then I charged both using TP4056 module and they ...
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1answer
61 views

Rechargable batteries

The diagram is from a wall mounted vacuum cleaner. What can the green thing be and what could its price be so i can replace it? Can i use 7 x AA NiMh batteries with 4800mAh each at 1.2 V ? Can i redo ...
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0answers
26 views

how to charge 2 Lithium ion 18650 batteries in Series and Parallel

i want to charge my 2 lithium ion batteries in series and parallel. as per my knowledge for single cell Capacity 3350mAh as per datasheet charge voltage: 4.2 V DC Charge current: 0.5C (1700mA) cut-off ...
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2answers
28 views

How to convert battery powered roller blinds to be solar powered?

I have some battery powered roller shades that I'd like to convert to using rechargeable batteries using a solar panel as the charger. My blinds are Norman Pro-Lift 25 CE blinds. They run off a long ...
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1answer
36 views

Help understanding a circuit (li-ion charger with 5v step-up) [closed]

In the circuit below, as well as in the typical application schematic for the tp4056, bat+ connects directly to bat- with a 10uF capacitor in between. Why doesn't this connection end up shorting the ...
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1answer
36 views

Rechargeable Li-ion battery pack

Sorry for the dumb question, but I'm very new here. I'm trying to power up an ESP-01 with a Li-ion battery pack recharged by a solar panel (12V). The question is can I connect the solar panel directly ...
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0answers
69 views

Water wheel turning a fan motor and voltmeter shows approximately 300 VDC. How to charge batteries from that?

I’m trying to create something to produce enough power to keep a bank of batteries (wired for 24 volt configuration) charged. Basically I'm using six to eight 12 volt batteries, wired to a 24 VDC to ...
0
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1answer
47 views

Help troubleshooting diy battery charge/protect/step-up circuit

I am following the schematic below trying to put together the circuit for a battery charger with over/under voltage protection and 3.7 to 5v step up. I have populated only the battery charger part of ...

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