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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
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663 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...
2
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0answers
27 views

Advice for a Solar Charger and Battery Project

I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
2
votes
0answers
14 views

bq24171 battery charger does not charge

I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
2
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0answers
61 views

What is the reason for high frequency noise when amplifier is powered with battery?

Hi I made a small headphone amp and powered it using lipo battery.voltage is stepped up to 5v.everything is working with direct supply (ie., while charging battery)but as soon as I unplug the charger ,...
2
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0answers
93 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
2
votes
0answers
120 views

Help to identify 10-pin IC in a GPS unit

I am trying to repair a GPS unit. There was a zener diode (to56 PolyZen protection diode) which had blown off and I had replaced. This is part of the battery charging circuit I believe, as once I ...
2
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0answers
371 views

Solar charging a lipo battery with ESP8266 as a battery load

I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery. An observation when ...
2
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0answers
67 views

Should I be conservative about setting the output voltage of the CV phase of Li-Ion charging

Background My application features a Li-Ion battery (NCR18650B) which I'm charging with the standard CC/CV method. Various constraints force me to use a generic buck converter (with current limiter) ...
2
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0answers
421 views

Why my charging circuit always heat up and malfunction?

I am working on troubleshooting bunch of overheating PCBs. I found that 2 components on my charging circuit always heat-up or malfunction even after replacement. The first problematic component is ...
2
votes
0answers
313 views

Lead-Acid Battery Desulfation Circuit Design:

I'm seeking ideas for making a pulsing lead-acid desulfation circuit design. Several circuit designs are available via Google image search, however, I'm hoping to get some help here to design a ...
2
votes
0answers
644 views

NI-MH battery charger using MAX712

I don't belong to electrical engineering but I am trying to develop a intelligent Ni-Mh battery charger for one of my project. I am using MAX712 battery charging management IC. Reason behind that is: ...
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0answers
33 views

Sense resistors in system-side Li-Ion charger/gauge circuit

I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack ...
1
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0answers
33 views

How to combine a charger for LIPO battery with a boost step-up voltage converter?

I want to power a device with up to 4A at 5V from a single-cell LIPO battery of 3.7V 5000mAh and be able to charge it. The idea is to have everything packed up inside a case, so I don't want to rely ...
1
vote
0answers
50 views

How to disconnect 3.7V battery when USB is connected (boost)

I am developing a circuit which enables me to charge a lithium battery and boost the output voltage up to 5V for a microcontroller. My boost converter is the MT3608, and the charging circuit is the ...
1
vote
0answers
45 views

Li-ion 3s Battery Charger with Load Sharing

I am requesting help to create a battery charger and load sharing circuit with the following specifications: 3s Lithium Ion battery 12 V at 2 Amps to power TPA3128D2 Class-D Amplifier (this is for ...
1
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0answers
55 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
1
vote
0answers
73 views

Multi-cell Li-ion battery charging

I am trying to make a charger circuit for a battery pack consisting of 6 lithium ion batteries (cells) in series. Many battery charger ICs support multi-cell charging but do not provide cell balancing ...
1
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0answers
62 views

Battery charging while in use in a bank

I have fifteen 12V 150Ah flooded batteries in series as part of a 10kVA off-grid system. Every once in a while, I test individual battery voltages. I've noticed that a few of them are, regularly, ...
1
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0answers
79 views

Boost converter voltage drop when charging battery

I made a 4s battery pack made of 18650 LiFePO4 cells that I'm planning to use for a mobile computing hobby project. My plan for charging it is to use a salvaged power supply from a computer along ...
1
vote
0answers
67 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 ...
1
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0answers
75 views

Capacitive discharge excess being used for battery recharging

I am currently designing a circuit similar to a cattle prod that is intended to be attached to a drone. The cattle prod is powered by a lithium-ion battery, charging up a capacitor and then quickly ...
1
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0answers
37 views

battery life of rechargeable lithium battery

I am trying to determine the life of a lithium rechargeable battery (approximation) before a complete replacement is required. From Panasonic's datasheet, I see that at avg. 10% discharge, it is rated ...
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0answers
669 views

Charge car battery with lab bench power supply

Is it possible to charge a lead acid car battery with a lab bench power supply? I am thinking of hooking it up to 13.8 Volts and 1 Amps. Will this work?
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0answers
82 views

Uninterrupted power supply with auto shutdown lead Acid Battery

Bellow circuit is an uninterrupted power supply(4.7 Vout after regulator) with auto shutdown when the battery is low. I am using a 6-volt lead acid battery with 9v charger. I am looking for an Idea ...
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0answers
100 views

Need a system to isolate an external charge circuit in a vehicle

I am looking for some assistance with options in isolating 2 parts of a circuit. I have a 4G hotspot that I am using in the car, powered via the cigarette lighter socket (rated at 12V/10A) and a 5V ...
1
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0answers
258 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
1
vote
0answers
40 views

How does non-ideal charging affect the life of a Li-Ion/Li-Po battery?

For lithium ion batteries, the standard way of charging them is CC - CV - cutoff. My question is, what are the effects of not following this pattern? For example, what if you charge with just a ...
1
vote
0answers
375 views

Li-Ion battery modification to charge with Ni-MH charger

First of all, I have to say I know "Li-Ion batteries can not charge with NiMH charging". So this question about li-Ion battery modification. 1. I found a battery from China that consists of 2 serial ...
1
vote
0answers
62 views

USB charging in place 3 Li-Ion batteries spaced evenly in parallel on LED string

I am a total noob in electronics, and so some other answers to this question are already over my head. I am working off the inspiration of this design of an LED hoop: https://philihp.com/blog/2011/diy-...
1
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0answers
397 views

Output voltage of powerbank circuit is the same as the battery voltage

I'm trying to use this small (and awesome?) unit as a boost/step-up converter for my project. I need to give my ESP8266 12-E NodeMCU a 5v input from a 18650 battery. Since this powerbank already had ...
1
vote
0answers
406 views

LiFePO4 solar charging problems (amateur question)

My application is primarily portable ham radio operation. I chose a self-balancing, 4.5 Ah, 12.8V, 4s3p LiFePO4 battery pack, a 28W panel and an MPPT solar charge controller with extremely limited ...
1
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0answers
126 views

Can I control the charge of a Cell-Phone with a 555 Timer and a Transistor?

I want to charge my phone in a controllable manner, using a 555 and a Mosfet transistor. The 555 is a countdown timer that gives an output (pin 3) of 5V for 1 minute, and then remains at 0V until an ...
1
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0answers
344 views

Charging 2 cell LiPo battery with MCP73213

I'm using an MCP73213 to charge a two-cell 7.4v LiPo battery using this circuit, when I tried charging the battery it was fine when I did this steps: Connect 12V power source Connect LiPo Battery ...
1
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0answers
59 views

Changing AA batteries for rechargeable Li batteries

I want to change 2 AA batteries in series for rechargeable batteries. The specs of the device are the following: -Input Vcc: 1.8-3.3V (It seems to support 3.5, not sure if it can be an issue) -...
1
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0answers
1k views

Are gas bubbles ok in Flooded lead acid battery charging?

I Have HBL power system's 2cell 4.2v lead acid battery which has capacity of 12Ah for C/ 100 and 9Ah for C/10. I found it in the rubbish and thought it may useful and in working condition.I ...
1
vote
0answers
3k views

Li-Po Battery Balance Charging Circuit

I work on a solar tracking project and in this project I have to charge my Li-Po battery to store power and use this power for supplying the system. For this problem, I searched for the li-po battery ...
1
vote
0answers
68 views

Masking the charging voltage on 12v battery

I am not an electrical engineer hence the odd question. I can wire and solder though. I have a dynamo charging a 12v 110AHr starter battery. The dynamo has a electronics that monitor the battery ...
1
vote
0answers
93 views

Automatically connecting LiPo batteries in series (for charging)

I have a battery charger capable of balance charging up to 10 cells in series (10S), but most of the batteries I use are somewhere between 1 and 4 cells. I have plenty of experience charging the ...
1
vote
0answers
306 views

Servo Regenerative Braking and Li-Ion Battery

I would like to power two of HSB-9370TH with one or two of these 7.4V Li-Ion Battery in parallel. I notice that the HSB-9370TH has regenerative braking, and my current application will have constant ...
1
vote
0answers
851 views

Powering a Raspberry Pi Rover with Lithium Ion Batteries and Charging Them

I am working on a 4 wheeled rover project. As the rover needs to be operated remotely, I will need some sort of batteries onboard. The major parts that need to be powered by the batteries are: ...
1
vote
0answers
135 views

How to design a circuit checking if 12V car battery is charging?

I have a small solar power charging module and load balancer, that takes input from a solar panel, has connectors for a car battery (12V) and output terminals. These things are pretty common on thing ...
1
vote
0answers
153 views

Pow Management IC: Li-Ion 2.8 - 4.2V; Sys Volts: 3.3V

I am designing a consumer Li-ion powered system with the following constraints: The system volts has to be 3.3V Li-Ion battery charging range is 2.8 - 4.2V Charging is to be done via a standard USB ...
1
vote
0answers
141 views

Is a Zener and a fuse enough protection?

We have a power chain that runs from an alternator, to a 24->12 dc regulator, to a battery charging circuit, to a 12 v battery. We were thinking of using this circuit minus the ac-dc converter part ...
1
vote
0answers
503 views

Reverse current frying a boost converter?

AFAIK, most boost converters incorporate a diode or some mechanism for ensuring that current flows from the battery to the output. For instance, TPS61030's datasheet says that This device however ...
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vote
0answers
540 views

What's wrong with this LiPo battery?

I have an 11.1v LiPo battery that has be working just fine and it recently dropped to 8.3 volts as it normally does during use. However this time when I plugged it into the charger the charger started ...
1
vote
0answers
153 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
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0answers
520 views

AGM Batteries: Comparison of Auto to Marine

Research (links go through to the actual product descriptions, for those who read specs): Diehard AGM Auto Group 34 775 CCA: $153 Diehard AGM "Marine" Group 34 880 CCA: $250 West Marine house brand "...
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0answers
1k views

L7805C/L7812C Voltage Regulator with 22V Solar Panel Not Outputting a Constant Voltage

First, here is my solar panel: http://www.amazon.com/Instapark%C2%AE-Black-Mono-crystalline-Charge-Controller/dp/B005LR9IOG And the regulator: http://users.ece.utexas.edu/~valvano/Datasheets/L7805....
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0answers
1k views

USB battery charger noise in an audio amplifier

As the title says, I'm having some issues with battery charger noise and an audio amplifier. The PCB with the charger and amplifier is connected to a GSM device, and that's where the audio signal for ...
1
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0answers
823 views

Lead-Acid Battery charger circuit

I designed this charger circuit and I really appreciate any hints or advices so I can modify it and choose right components values. I'm charging a 6V 4Ah Lead-Acid battery.