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).

259 questions with no upvoted or accepted answers
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1answer
904 views

MCP73833 power path problem

I'm having trouble with MCP73833. It's 1S lipo charger powered from USB. I followed this figure from application note: My schematic: Battery connectors are X4 and X5, load is connected, USB is ...
3
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1answer
75 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 ...
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1answer
54 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 ...
3
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1answer
717 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, ...
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2answers
67 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 ...
2
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0answers
57 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 ...
2
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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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1answer
115 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 ...
2
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1answer
73 views

Why is there a maximum charging current much lower than maximum discharging current on a li-ion pack?

I will have soon an electric scooter with a 60v (top 67.2v) and 35ah battery pack. As it is designed, it can be charged by one charger which pumps 2,5 amps or it can be charged by 2 chargers in ...
2
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1answer
273 views

Is it okay to connect 2 lithium ion battery in parallel to a charger that can maintenance 4.2V? (more detail in post)

So I'm planning to make a charger that can charge multiple lithium batteries in parallel with hope to use recycled one. I fully understand that they are dangerous when you do it incorrectly, so I just ...
2
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0answers
74 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 ,...
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0answers
128 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 ...
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0answers
121 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
395 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 ...
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0answers
468 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
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1answer
670 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 ...
2
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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: ...
2
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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 ...
2
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0answers
326 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
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1answer
583 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated charge....
2
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0answers
681 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: ...
2
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1answer
2k views

Connecting multiple batteries to a battery tender / trickle charger

I have multiple 12V batteries, some small ATV starter batteries (12Ah and 9Ah) and some deep cycle (120Ah and 97Ah). Can I connect all those batteries to the same battery tender in parallel? Could I ...
2
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1answer
202 views

How to connect four different ground planes in the same PCB?

I am working on a project which uses the LTC4020 multi-chemistry battery charger from Linear Technology. The design includes a microcontroller ( NXP KL25Z) to provide additional outputs and ...
1
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1answer
40 views

12 V / 140 Ah lead acid battery charging with 24 V / 150 A alternator

Can I connect two 12 V / 140 Ah lead acid batteries in series to get 24 V / 140 Ah and connect directly to a 24 V/ 150 A alternator to charge them? Or do I need any charging / protection circuit in ...
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0answers
32 views

Is it possible to somehow revive an AGM battery, that quickly loose voltage when used?

I have a GLP 120-12 AGM battery, this thing to be exact: https://glpower.eu/produkt/glp-120-12/ It's a 120 amps batter, and it is about 26 months old. All of a sudden, I noticed that the battery is ...
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0answers
33 views

Power supply charging backup power - current flow via mosfet

I have following diagram on falstad Top +5V is main PSU (12V 10A). Bottom +5V is battery (12V 2.3Ah). I have load about 2-3A so I dont think diode is good solution. Well I am trying to achieve ...
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0answers
42 views

Li battery charger reference voltage problem

schematic datasheet I have designed a battery charging circuit for a lithium ion battery.When i connect a battery the charging IC seems to do nothing. Only when i use a multimeter probe to measure ...
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1answer
91 views

Arduino PSU with battery backup (SLA) and mains/battery monitoring

Please could somebody review my following schematic, as it is my first attempt at a PSU circuit. The aim of this circuit is as follows: I am using a 15V (150W) PSU to power an Arduino, 2 separate 12V ...
1
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1answer
114 views

Can I make endless parallel li-ion connections?

I'm looking into building my own li-ion battery pack. I read about linking the cells in parallel and in series, and how to add a BMS. I would like to build a 12V pack with a very large capacity (mAh)....
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0answers
64 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 ...
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0answers
85 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 ...
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0answers
61 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 ...
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0answers
145 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 ...
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0answers
65 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, ...
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0answers
71 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 ...
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1answer
43 views

Charging Multiple 3S Lithium Ion Packs Together

This is my current situation, just to provide background: I wanted to build these small battery pack modules that were 3S2P as a modular system, where a pack could be used with many different ...
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2answers
80 views

Measuring battery voltage in PV scenario with MPPT charge controller with inverter

So I'm doing a PV project with wifi enabled statistics. I'd like to see the watts coming in and out and the battery charge level, estimated battery charge and discharge time. I'm designing PCB to ...
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0answers
77 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 ...
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3answers
192 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...
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0answers
43 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
1k 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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1answer
259 views

How to make battery controller with arduino?

I want to make simple UPS with means of arduino, to learn the processes from it, and be able to record and monitor at PC. For the start i want to implement buffered usage charge mode. Logic is simple -...
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2answers
1k views

Do I need to fuse batteries in parallel?

I have two deep cycle batteries in my Airstream, in the panel there is a fused bus bar (that appears to be faulty) so the solar panels only charge the one battery. Can I just run a heavy gauge wire ...
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0answers
91 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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1answer
244 views

How to design a circuit to disconnect battery charger automatically?

I want to use an AC to DC 14.4v adapter to supply both my circuit and its battery. The circuit works with 12v and I used a battery during power outage(blackout time). I have prepared the below circuit ...
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1answer
166 views

What can you tell about our circuit diagram? Any suggestions?

This is our circuit for our research which is the conversion of heat to electricity. The TEG module will convert the heat to direct current. It will give energy to the voltage booster moduleto and the ...
1
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1answer
177 views

charging lithium ion battery of 3.7v

I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module. when I connect a battery to tp4056, battery fully ...
1
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1answer
141 views

How to keep a small Li-Ion battery on float for backup service?

I have a number of small electronic widgets (similar to small arduino boards) that generally draw 100uA-10mA avg with infrequent 50mA-100mA peaks (e.g. radio or cellular TX) and for some I'd like to ...
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1answer
48 views

Can a sealed lead acid battery charger work properly with a flooded / wet cell deep cycle battery

I know that charging sealed / AGM / gel cell lead acid batteries requires a special charger so they don’t get overcharged, overheated, boiled out, and destroyed. Is it safe to use this special type ...
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0answers
133 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 ...