Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

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).

0
votes
1answer
29 views

How to build a charging indicator around my OralB Braun toothbrush wireless charger?

The charger looks like the below image: I tried winding copper wire around the cradle (Around 25 turns) But couldn't read anything on the voltmeter. My guess is that it is having some sort of ...
0
votes
0answers
13 views

Odd behavior charging Apple products from 5vdc [duplicate]

I'm designing a PCB for a product, and this product will incorporate a 5vdc USB-A output to charge other devices. To get a sample of what current different devices will draw from a non quick charge ...
1
vote
0answers
56 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 ...
0
votes
1answer
28 views

Charging SLA Battery

I currently have a project requiring the use of a battery. My project has to be able to run off the battery power, but when an outside source is connected, the battery should be able to charge off ...
0
votes
0answers
38 views

external phone parallel battery

I’m trying to find a way to place a 5000 mAh battery outside of the iPhone 5s case, and perhaps altogether removing the internal one if needed. The battery outside is taken from an external battery ...
0
votes
1answer
116 views

MOSFET switch between parallel batteries for dual charging

UPDATED: I am developing a wireless device composed of : 2 Varta CP 1654 A3 Li-Ion 3.7V 120mAh (supporting 2C charge) with protection circuit module 2 MCUs that can handle Li-ion CC/CV charging My ...
0
votes
1answer
47 views

Can high power USB destroy older devices? [duplicate]

My brand new pair of bluetooth headphones stopped working after charging them with a 2.1 Amps USB outlet. I can't turn it ON anymore. I do see the LED battery Green then I charge it though. I noticed ...
0
votes
1answer
29 views

Designing a 2S Li-ion charger with 5V 2A input

I'm interested in designing a few similar charging circuits based on the specs of the title which is getting a charging for 2 cells in series(or more) from a 5V input. Now my question is: Assuming I ...
0
votes
1answer
61 views

How to detect mains outage for 12V SLA battery charger

I'm wanting to use a 12V SLA battery and off the shelf mains charger as an uninterruptible power supply for an Arduino or similar device (via an appropriate 12->5V regulator) as also described here ...
1
vote
2answers
74 views

Can I charge my AC rechargeable hearing aid batteries via USB PD with converter?

I hope you'll be able to help. First of all this is a bit of a complex one that I'm struggling with. I wear hearing aids, both of which use removable, rechargeable batteries, charged only by a charger ...
0
votes
1answer
56 views

Lead acid battery charging current dosent become zero

Here I am charging a 6V 4.5Ah lead acid battery by using a 8V-10V LM317 input supply for the circuit. I'm using the BD139 transistor to cut off and a 6.8V zener diode. As the battery voltage reaches ...
-1
votes
0answers
27 views

Charge a 3.65V battery [on hold]

I have a 3.65V/2150mAH battery and it was in a PCB. I unsoldered the battery from the PCB (I accidently shorted out a connection on the PCB, so the said PCB is useless now). The PCB had a charging ...
0
votes
2answers
39 views

SLA battery constantly being charged and used

I have a 12V 7Ah SLA battery with a smart battery charger for SLA batteries with the maximal output of 0.8A. I would like to use the battery to charge an Arduino board with few other things (at most ...
0
votes
2answers
39 views

Charge current for a 8000 mah lipo battery?

I have a 3.7V lipo battery with 8000 mah nominal capacity. From what Ive seen online, the charging current should be 8A for a 8000 mah battery. Is that true? Will charging it at a lower current damage ...
1
vote
1answer
34 views

4Channel Smartphone Charger 5V 25A [duplicate]

I wanted to experiment a Smartphone Fast Charger. My source would 5V 25A, and output would be in 4 channels, all in parallel. Would that be safe to charge a smartphone? If no, what can I use to bring ...
0
votes
1answer
24 views

Use both mini-USB and micro-USB power supplies in parallel

I would like to add both mini-USB and micro-USB connectors onto my PCB for Li-Ion battery charging. Is the attached schematic fine (safe) ? I have never tried such type of connection yet and it ...
1
vote
1answer
66 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 ...
2
votes
0answers
33 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 ...
0
votes
0answers
34 views

What is the actual proper way to integrate a balancing charger into a multi-series li-ion pack?

What I want to do is build a pack that in order to charge and use it all you have to do is plug in a wall wart (the way commercial products like laptops, phones, E-skateboards, etc. I have scoured ...
-1
votes
1answer
64 views

18650 batteries in parallel

I have encountered a bizarre situation, i bought two 18650 batteries each of 3.7V, 2200mAh, im using a Tp4056 based charger with battery protection which has DW01A and FS8205 to protect the battery ...
-2
votes
1answer
93 views

Why do lead-acid batteries only last for a few years? [closed]

Why do lead-acid (automotive-style) batteries typically only last for a few years of regular use (or x amount of cycles) before having problems? Obviously, things can't last forever. But, what are ...
0
votes
0answers
39 views

When Battery Charging, Prevent Draw from Circuit (Using TP4056)

Hopefully someone can help me, this is probably pretty easy but I am a hobbyist who is getting into all this with little advanced knowledge (if any!). I want to integrate a Li-Ion Battery Charging ...
0
votes
1answer
23 views

Recharging multiple batteries with solar panel

I have 1 solar panel: 7v, 1.5watt and 1.2v Ni-Mh batteries, 3000maH I am planning to use it to recharge my 1.2v batteries, I am not sure if i can charge 5 x 1.2v batteries using this solar panel. ...
0
votes
1answer
66 views

Clarifications about charging a 9V battery?

I have a project in mind with Arduino but I wanted to use a battery to power all of it. I have to power a Wi-Fi module and a small servo/stepper for a short period of time, maybe a RTC circuit and a ...
-1
votes
0answers
71 views

Connecting multiple TP4056

I need to fast charge the Li-ion batteries using 2A charge capacity,that i want to build using solar power supply,I'm considering this circuit where 4 parallel TP-4056 charger IC's are connected, This ...
1
vote
1answer
108 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 ...
0
votes
2answers
59 views

How to find out the spec of an unmarked li-ion battery [closed]

I have got some li-ion batteries which I don't know anything about and there is nothing written on them. Can you advise some testing methods to find out about their specifications and charging data so ...
0
votes
0answers
28 views

Electrically rewiring cells into series or parallel, BMS decision

I was thinking about making a battery pack that would alow me to select two voltages by electrically switching (via transistors) two parallel 5S battery packs into one 10S battery pack. It offers me a ...
0
votes
1answer
34 views

PMIC with Li-ion charger, stable output and USB OTG?

I am developing small board with MCU, lithium battery and USB OTG and I am wondering what is the simplest way to power up the whole thing? Basically: If USB cable is connected - PMIC detects type ...
0
votes
2answers
51 views

how many amps would a 12 v -20 ahr battery draw when charged with unlimited current power supply?

i have 3 X 12V battery i use them to drive a dirt bike .i want to charge them with a 36v-30A power supply the maximum charge current is 6 amps that is given by the manufacturer . will this damage my ...
0
votes
1answer
44 views

Charging Lithium ion battery with a modified charger

I've a defective charger for a small LED torch light, its output is 4.2V / 500mA. I may not find an alternative one, so I'm considering modifying a mobile phone charger as following: The mobile ...
-3
votes
1answer
32 views

Power management problem on Samsung SI9000? [closed]

I have a Samsung SI9000 model SPH-D710 Sprint version. The issue I am having is the phone seems to not be charging the battery. Currently the battery is fully discharged and when plugged in and ...
0
votes
2answers
95 views

Does wireless charging degrade battery life? [closed]

Does a design using wireless charging such as QI effect the longevity/health of lithium-ion batteries such as those found in modern consumer electronics devices? What special considerations must be ...
0
votes
1answer
43 views

I have a 9v battery that is only needed to output power during night time/when the sun is down, how can i do this?

My main question is, am I able to use a solar panel to only allow power flow when it is dark outside?/When the Solar panel isn't receiving any light? What would the circuit for that look like? In the ...
-1
votes
2answers
113 views

UPS using TP4056 and 18650 Batteries [duplicate]

I have build this UPS battery supply to power a Raspberry Pi using 18650 batteries,using the TP4056 battery charge controller. The circuit as follows: This is working fine at the moment, but I'm ...
0
votes
1answer
35 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
0
votes
3answers
467 views

Do I need a BMS for Li-ion batteries connected only in parallel? [closed]

I have a device that runs on a single cell Li-ion / LiPo. The physical case for that device allows me to put in one to three 18650 cells. Unfortunately given the disposition of the cells, I can't buy ...
0
votes
1answer
86 views

Solar Power with Battery Backup Circuit

As a disclaimer, I'm a novice when it comes to electrical engineering and I am looking for assistance in order to complete my endeavor. I have spent the past few weeks teaching myself concepts and ...
0
votes
1answer
36 views

Charging and Using a Lithium Battery

I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
1
vote
1answer
40 views

In Charging Circuit with battery detection

The circuit is charging the battery with Vcharge and VCharge also power up the circuit operation. Battery will serve to power the circuit when main power supply VCharge cut off. A switch is added to ...
0
votes
1answer
48 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 ...
0
votes
1answer
38 views

Can I use a car battery as input for a solar charging controller? [closed]

I have the following setup 30W 12V solar panel connected to 260W solar charging controller connected to 12V 7Ah AGM battery I would now like to use my 60Ah car battery to charge the 7Ah AGM battery....
0
votes
0answers
38 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
0
votes
1answer
21 views

Adafruit USB LiIon/LiPoly charger - v1.2, charging multiple batteries with series output WITHOUT switch?

On their documentation page, Adafruit offer a tutorial for using it with 2s li-ions. However that also required a 3pdt switch, which would have to be manually thrown. Since in my project I will not ...
0
votes
2answers
156 views

Mobile Home battery charger transformer

I need some help regarding the transformer in the battery charger unit. The lightning struck my house, and sadly the mobile home was connected to 230V outlet. Among other things that needed to be ...
-1
votes
1answer
44 views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
-2
votes
1answer
43 views

How can I make a battery pack with 6 18650 Li-ion that is USB rechargeable?

I'm new to electronics and DIY stuf but I wanted to make a Bluetooth speaker and there for I need a battery pack. I looked up a lot of information on the internet but couldn't find how I could ...
1
vote
2answers
122 views

Why is it recommended to not use a device while charging? How does it harm the battery or the device?

I was planning on getting the new VR headset from Oculus, dubbed Oculus GO. The battery life of that thing is roughly 3 hours max. So, during long VR sessions, powering the headset via a power bank ...
0
votes
2answers
84 views

Safety of Using USB Charger [closed]

I am looking at getting a 3 port USB wall charger, to save having so many individual ones plugged in. A lot that I've seen offer Qualcomm FastCharge, and other similar things, which are around 2.4A, ...
0
votes
2answers
91 views

Why is neutral required in three phase charging of Electric vehicles?

Talking about both three-phase AC as well as DC fast charging (wherein 3 phase AC is converted to DC) in EVs, I think that the 3-phase rectifier represents a balanced 'load'. Therefore I want to know ...