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).

325 questions with no upvoted or accepted answers
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88 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
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1answer
44 views

Battery Management Controller

I designed a wearable with a 3.7V Li-Po battery (381018). Everything worked good at the begining and now after 6 months I realize some circuits are not charging anymore. For what I understood when I ...
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0answers
44 views

Strange Behaviour of Lipo Battery ESR during charging

I performed three charge tests on a single cell 190mAh Li-Po battery with Keithley Battery Simulator instrument. Charging started at 3V and stopped at 4.20V in all tests. After completing the three ...
2
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1answer
117 views

Rechargeable battery pack for circuit

I have this circuit and I have to somehow integrate this into a mobile phone cover. So to power it, I was thinking of using a 3.7v 600mAH Li-Po battery. I want to integrate the battery into the cover ...
2
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0answers
113 views

TP4056 and ST32F103C8T6 shorting after few uses

Complete schematic: Top part: Lower part: This is the circuit schematic, top part is sensor, bluetooth, microcontroller, oled and pins related all working from 3.3v coming from regulation of a ...
2
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1answer
598 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)....
2
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2answers
93 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
119 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
21 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
73 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 ...
2
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1answer
241 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
509 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
170 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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1answer
2k 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?
2
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1answer
457 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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0answers
209 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
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1answer
298 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 ...
2
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0answers
128 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
422 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
619 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
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: Bluetooth amplifier module 3x Samsung ICR18650-26FM Batteries ...
2
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0answers
345 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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0answers
750 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
438 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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0answers
73 views

DIY Power Bank without auto shutoff

I own a small data logger for recording accelerations. The data logger is a Slam Stick X with integrated 250mAh rechargeable battery. My problem is that the capacity of this integrated battery is far ...
1
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0answers
29 views

Is it safe/possible to add a BMS board to a soft pack 3s1p LIPO for charging and discharging?

i would like to make a 12V battery pack from a soft pack LiPo which can supply 10A for my projects which i can charge from a 12.6V DC wall powersupply. I dont want to use an external big special BMS ...
1
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0answers
31 views

P-MOSFET power dissipation spike when turning off (10 - 100khz)

I designing battery charging circuit, I found the following step down converter for charging. The target is to charge a battery with 3-4 A, but the P-FET (NTF2955) becomes very hot at 0.5 amps: I ...
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0answers
22 views

Detect Battery Insertion in USB Charging Circuit

I'm using an MCP73831T as the charger IC, I've figured out how to detect the charging/charged, this was easy, however, I would like to know when the battery is actually plugged in, I know when the usb ...
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0answers
18 views

How to know if battery is charging?

There is a Heltec's wifi kit 32, that is based on esp32 controller with a battery attached. I want to write a script to know if the device is plugged in to a PC or a charger. Script provided here by ...
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0answers
63 views

24V battery charger with LM723

I have a 28V steady DC input, and I want to use it to charge 2x12V lead-acid batteries in series. I want to use the LM723 IC to make an adjustable (26V to 28V) regulated output, as it has current ...
1
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1answer
37 views

Single cell Li-ion battery doesn't charge with PMIC, but does charge without

I'm trying to charge an Adafruit 500mAh battery with a custom PCB I made. However, when I include the AP9101C protection IC (with accompanying DMG6968 common-drain MOSFET pair), it fails to charge. ...
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0answers
30 views

Determine 9V NiMH battery cell count

I have a bunch of 9V NiMH rechargeable batteries. I also have an adjustable CC/CV charger and to have battery fully charged with that I need to know the correct stop voltage. I have read that 9V pack ...
1
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0answers
32 views

1 battery backup 2 garage doors

I have made a very simple battery backup for my garage door. 2 x 12v batteries in series and hooked into the battery terminals of my opener. This charges the battery and switches to backup on power ...
1
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0answers
46 views

Mini UPS 5V Module

I've bought a mini 5V UPS board that I need to coninously power a Raspberry pi. In the image description I see that there are 2 D+ and 1 D- PINS INPUT (wall supply, for example), 2 D+ and 2 D- pins ...
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0answers
49 views

E-bike battery-related questions

I am a beginner and I am learning to design and develop a Battery Management System for low voltage applications like E-Bike. I would like to build a 36 V, 10s, 2500 mAh battery pack. The knowledge ...
1
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3answers
79 views

How to drop 5v regular phone charger voltage to 3.7v to run a device, which use 3.7v output battery before

I have Motorola Moto 360 2st edition smartwatch and watch original battery is dead. I have converted smartwatch into table watch in DIY wooden block and added 18650 3.7v battery instead and now its ...
1
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0answers
231 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
1
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0answers
214 views

Issue with TP4054/How not to damage li-po charger ICs

My issue is: The TP4054 I am using started drawing 150 mA after something I did. I know that I have probably fried it and the obvious answer is I should ditch it and take a new one. However I am not ...
1
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1answer
54 views

Electrical calculation

I'm need to calculate the how long it will take to charge a battery using a solar cell. I am not taking any charge curves into account, I just want to get a close answer before I run the experiment. I ...
1
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0answers
84 views

Battery management - disconnect battery like this?

For a portable device i have the following battery management circuitry: I'm using the MCP73871 for charge management and power oring and the BQ2972 for over discharge protection. If VBUS is ...
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0answers
99 views

Is it possible to fully charge a 12V lead-acid traction battery using a car battery charger?

I got a 45Ah 12V traction battery for my experiments and I was assuming that I can recharge it using a normal car battery charger (the main difference between 12V car starting battery and 12V lead-...
1
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1answer
1k views

Maximum Initial cutrent parameter of Lead-acid batteries

On lead-acid batteries, there is a parameter called "maximum initial current" which is generally written on it. I have added some pictures of it at the end of the question. My confusion is how to ...
1
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1answer
51 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 ...
1
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0answers
264 views

Is it possible to somehow revive an AGM battery, that quickly loses 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 battery, and it is about 26 months old. All of a sudden, I noticed that the battery is ...
1
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0answers
40 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 ...
1
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1answer
295 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 ...
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0answers
142 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
249 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
253 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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