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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).

3
votes
1answer
69 views

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current ...
2
votes
1answer
4k views

TP4056 lipo charger output voltage

for a project I'm looking for a charging solution to charge a lipo battery, while at the same time being able to power a microcontroller with 3.3v. For that purpose, I bought a few TP4056 boards that ...
0
votes
1answer
677 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
1k views

12V SLA Battery Charge Controller

i'm building a robot (a sort of rover) which includes a 12V/7Ah SLA battery. The robot circuit needs a regulated 12V supply to work correctly. I would like to charge my rover using a generic 14-19V ...
0
votes
0answers
53 views

How to switch between charge and discharge?

I want to make my rpi 3 portable with adding a rechargeable battery pack to it. I have 6 Li-ION batteries that are packed together in 2 series rows of 3 batteries in parallel(each battery is a 3.7 ...
0
votes
1answer
656 views

Calculate LifePo4 charging amps

How do I work out the optimum charging amps for a life 2p4s battery? I have 8 x 66ah sinopoly batteries. http://www.sinopolybattery.com/userfiles/files/SP-LFP66AHA.pdf Charge Specs * Standard ...
0
votes
0answers
38 views

Overvoltage Protection for Battery Charger

I'm trying to come up with some form of precise overvoltage protection between battery chargers and batteries between 12V and 48V batteries. I have 12 and 24 sorted using different methods: crowbar ...
1
vote
2answers
118 views

Battery operation, charge and discharge processes misconceptions

I'm trying to elaborate a simple explanation (and conceptually correct) of how a battery charges and discharges, and why we say things like "the charge stored in the battery is x Ah". For now, I have ...
0
votes
2answers
234 views

How to choose the resistors for UC3906

I would like to build a battery charger with my UC3906 IC. I found a lot of data-sheets, application note, etc. but nothing that comprehensively explain how to choose the values of the resistors. I ...
2
votes
1answer
650 views

Proper way to recover 18650 cells from laptop batteries

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
0
votes
1answer
104 views

Dual battery setup

I want to make a dual battery setup on my car. Doing some research I came across the two main techniques to do this, both based on isolate the two batteries being fed from same alternator to avoid ...
1
vote
1answer
388 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 ...
2
votes
1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

it is my first question here, so I hope to write this in the right way. What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: ...
0
votes
2answers
110 views

Smartphone internal charging circuit type and efficiency

USB usually provides 5V (or even more, for example 9V with Qualcomm Quickcharge) and the phones contain a single li-ion cell with 3.5-4.3V, so there must be some dc-dc converter in between. I wonder ...
0
votes
1answer
64 views

Xbox one controller rechargeable battery

I wanna make rechargeable batteries for Xbox one controller.i'm new in this field So I have some questions 1_The controllers voltage input is 2.4-3.0 volt. Now is any issues if I use li_ion 14500 ...
0
votes
0answers
16 views

Does MP2617H power management IC need an external regulator to supply “Vin” using a 12V solar panel?

I'm designing a LiPo battery charger using MP2617 power management IC. When I referred to the datasheet it tells that these ICs have an internally integrated voltage regulator for the battery charging....
0
votes
0answers
47 views

Disconnecting TP4056 DW01A from load when plugged into USB

I have adapted a load sharing circuit that was posted online that uses a MCP73831 to charge a Lithium battery. In my case I wanted to to use the TP4056DW01A and connect its output to to a boost ...
0
votes
0answers
22 views

battery charge controller with small panel

i am designing a battery charge controller with a small panel of 4.5V and 250mA in Arduino UNO. I want that the panel charges the battery(1.2V 3000mAh AA NiMH). i wonder where i place the panel in ...
0
votes
0answers
37 views

Importance of Lithium battery cell balancing

Why is cell balancing important for my R/C battery packs but not for some of my power tool or laptop battery packs? Under what conditions can you use serial connected Lithium cells without load ...
0
votes
1answer
29 views

Thinkpad 420 battery not charging despite of Cells inside are good [closed]

My thinkpad 420 battery is not charging. So far I have done following. Put another battery in my thinkpad and it is charging perfectly. Opened the defective battery and checked all three sets of 2 ...
3
votes
3answers
617 views

Are laptop cells balanced while charging?

I have little-to-no knowledge about how the laptop batteries work. I know there is a microcontroller to actually verify the balancing between cells (and in case blow up a fuse or something similar). ...
1
vote
2answers
2k views

Li-ion battery life after being 'completely' discharged

If the voltage of a lithium-ion cell drops below a certain level, it's ruined. Lithium-ion batteries age. [Source] As an owner of quite a lot of expensive mobile devices (lots of Apple stuff for ...
2
votes
1answer
106 views

What is the minimum charging current for NCR18650 li ion battery? [duplicate]

I need a rechargeable battery pack for my project, I need to know what is the minimum charging current for NCR18650 li-ion battery? In the datasheet, it says max charge current is 2A. what is the ...
1
vote
2answers
71 views

Li Ion CC-CV Charger needed for standard protection board? [closed]

I am currently designign a 4S2P Li-Ion battery pack. The cells I use are unprotected, so I want to use one of those BMS/Protection/Balance boards like this: https://www.ebay.de/itm/4S-40A-16-8V-40A-...
5
votes
3answers
2k views

To pulse or not to pulse

It is accepted practice to maintain lead acid batteries at a float voltage of roughly 2.3 Volts per cell. The precise value depends on battery type and battery chemistry and ambient temperature. We ...
2
votes
1answer
114 views

Why are(n't) rechargeable batteries damaged by partial charging?

Over the years, I've come across websites and people with different opinions on the "correct" way to charge rechargeable batteries (I'm more concerned with laptop, tablet and phone batteries than with ...
4
votes
1answer
60 views

Preventing overcharge of a SLA battery in a solar electric fence charger

I recently purchased a solar electric fence energizer, specifically the Patriot PS5. After it had been sitting in the sun a while, I noticed the battery was making a "gurgling" noise, which according ...
0
votes
0answers
45 views

How does recuperation works in BLDC?

Using BLDC wheels is common on electric transport. A wheel is a multiphase motor, where each phase(coil) is separated from power source(battery) with some kind of transistor, driven by PWM-like signal....
9
votes
3answers
20k views

If Li-Ion battery is deeply discharged, is it harmful for it to remain in this state unused?

It is well known that Li-Ion batteries should not be deep discharged. But sometimes they do discharge deeply. Is it OK for the device to remain in such state for a long time (and recharge again only ...
0
votes
1answer
60 views

How to make a battery level indicator for arduino (The battery is powering the arduino also) [duplicate]

Hi I am building a pocket altitude, temperature and humidity meter with 1.8" TFT display. I have a 1000mah 3.3v Li-ion battery to power the whole system. I also need to display the battery level in ...
1
vote
1answer
4k views

Can wet-cell and gel-cell batteries be mixed?

Given the same power ratings, can a (lead-acid/deep-cycle) gel-cell battery be paired together with a wet-cell battery in use? For example, with a motorized/electric wheelchair, would one be able to ...
0
votes
1answer
60 views

Low current LiFePO4 battery charging

I have a portable solar panel capable of delivering 21W at 5V. I would like to be able to charge my 12V LiFePO4 battery with this panel. My AC-powered charge controller is rated at 14.4V 4A which I ...
0
votes
0answers
30 views

how to make rechargeable 2s2p 7.2v configuration with tp4056?

I am using NCR18650 li-ion batteries I need to make 2S2P configuration get higher capacity and 7.4V the same pack I need to charge with TP4056 modules. also, I am using B0505S voltage isolator as ...
0
votes
1answer
63 views

Battery and dc input

I’m currently designing a circuit. It is required to be powered by a 12v dc input (when connected) else a 3.7v battery (the battery should be charged when 12v is active). The circuit requires 5v ...
0
votes
0answers
27 views

Charging Voltage of Lead Acid Batteries

I recently installed a solar ups and it has been charging the batteries all the time. I have two 12v 230ah Batteries (lead acid tubular) in series and my solar charger software says that it is ...
2
votes
2answers
60 views

Trickle charging 10NiMh in series with ~1W solar panel

I have been put onto a project that needs to be powered by a small (1-2W) solar panel trickle charging a battery pack. The product will be located on rooftops. We have reviewed similar products and ...
0
votes
1answer
96 views

cheap charge management + protection circuit or fuel gauge + protection circuit

I would like to know if it is possible to have in the same package a fuel gauge ic + a protection circuit for lipo battery, or a charge management + protection circuit, in the same package. I have a ...
0
votes
1answer
58 views

Newbie question about BMS boards and 18650 cells

I would like to replace/convert some old (non working) 18v Nicad power tool batteries to use 18650s instead. I've got some brand new 18650s and some 5s battery management system boards, but as a non-...
0
votes
0answers
32 views

Using a laptop battery with a buck converter with current limiting

I am building a smartphone-powered laptop similar to this. The case is an old HP Pavilion DV4000 that I got. I would like to use its battery for this project, because laptop batteries already have ...
4
votes
2answers
5k views

How to monitor voltage and charge status in USB battery pack

What's the easiest, least intrusive way to monitor voltage, charging status, and remaining charge of a USB battery pack? Battery packs and charging circuits for mobile projects can be complicated and ...
1
vote
3answers
353 views

Is it OK to reduce the charging current for a Li-ion 18650 battery?

I am using NCR18650 batteries with the tp4056 charging module. When I connect the charger at 2.8 V (fully discharged), the tp4056 IC is getting hot at a 1 A charge current. Is it OK to ...
0
votes
1answer
127 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 ...
1
vote
2answers
108 views

What should be the V specs of a step down transformer for a 10amp car battery charger

I was looking to create a 10amp manual charger with variable voltage and current option for flooded lead acid battery (normally used in cars). I only know some basic electronics and usually make ...
16
votes
5answers
48k views

How long does it take to recharge a car battery after starting?

Assuming a typical lead-acid, 12 V car battery (typically at 13 V or so fully charged), and that it takes roughly 500 A over 3 seconds to start an engine, how long will it take to recharge the battery ...
0
votes
0answers
80 views

is it OK to use battery while charging? [duplicate]

I am using the tp4056 module with protection to charge NCR18650 li-ion battery. is it OK to connect to the load to the battery while it is charging? I am using a booster to boost 3.7V to 9V(load ...
1
vote
2answers
1k views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
0
votes
1answer
48 views

Battery level sensor

I'm designing a smart bin for my paper and would like a sensor that continuously monitors the battery level in real time and in percentage value and then sends the data to the administration office. ...
1
vote
2answers
139 views

Necessary voltage to charge NiMH using Solar Panel

I'm trying to understand which voltage I need to charge my NiMH batteries so I can purchase the components to do this. Actually I have 2x AA Ni-MH 1.2 V 1900 mAh and 4x Solar Panel 2 V ...
2
votes
3answers
440 views

Can NiMH batteries charge at cold temperatures?

While I am aware of the risk associated with charging Li-ion below 0 °C and that the charge acceptance for a NiMH battery decreases with rising temperature, I am finding conflicting information ...
0
votes
2answers
34 views

Different AH 12v battery to battery bank OK?

Can I safely add a 12V 200 AH AGM battery to a 12V 230 AH AGM battery (from different manufacturers) for a small solar system?