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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).

-2
votes
2answers
431 views

How to charge lithium ion battery in series and parallel?

I want to use TP4056 in my solar power bank project to charge a lithium-ion battery (3.7 V, 2000mAh each one), but I don't know how to use it when I want to charge more than one battery. Is those ...
2
votes
1answer
139 views

How to find out what level of battery voltage corresponds to 50% discharge?

In my off-grid solar system I am using 12V lead-carbon batteries capable of surviving 4000 cycles when discharged up to 50%. Capacity is 200Amp-Hours (100 Hour discharge) per battery. There is no BMS ...
-1
votes
2answers
191 views

Battery bank system for a load of 1600 Watts

How many batteries of 12 V x 125 Ah needed to continuously run a load of 1600 Watts using an inverter of 24 VDC x 120 VAC that uses a battery bank as primary source? For a load of 1600 W , at least ...
0
votes
1answer
24 views

Charging rate for deep cycle 12v battery

I have a 75 AH deep cycle battery(AGM) and I have a battery charger with 2 modes, 5.5A for car, 2A for motorcycle, as far as I remember, lower charging rate is usually better for longer battery life ...
0
votes
1answer
57 views

How can I limit the voltage of a circuit so that it is always between 8 and 15 volts?

I am currently working on a project in which I am using piezoelectric material to charge a battery. The voltage output of the piezoelectric material is variable depending on how much mechanical energy ...
0
votes
0answers
57 views

Calculating Rprog for MCP73213 Li-Po charging IC

I would like to use the MCP Microchip MCP73213-A6SI/MF to charge a 7.4v 1000mAh Li-Po battery. (This one). The website doesn't give much information but mentions that the continuous discharge current ...
0
votes
2answers
751 views

How to charge a 48V battery (12V battery * 4 in series connection) with a 12V charger?

I found a question about charging the battery with a 12 volt charger. However I’m confused as to do this? First method, unhooking and charging each battery individually? But wouldn’t I be just ...
0
votes
1answer
70 views

Charging a device with higher amperage, can somebody please clear up the confusion and contradictory statements?

I have a PS Vita I wish to charge with my Samsung Galaxy charger, its output is 9.0V = 1.57A which is for fast charging (correct me if I'm wrong) and thus won't handshake with the Vita so won't supply ...
1
vote
0answers
421 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?
0
votes
1answer
38 views

How does this circuit works for detection of Logic low, Logic High and Hi-Impedance state?

I was working on a design of Li-ion battery charger using LTC4001. Here a pin is called CHRG, which indicates the different state of charging like charging cycle begins, threshold reach(i.e 4.2V or C/...
0
votes
1answer
151 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 -...
0
votes
1answer
144 views

How can I use two TP4056 with four Li-ion batteries, but single load?

Need to connect and charge two Li-ion batteries in series. I'm not sure if it is possible to connect and use two Li-ion batteries and TP4056 like this. Are they going to be balanced? Do they need to?
0
votes
1answer
33 views

Frequently interrupting the CC charging stage of a Lithium-Polymer battery

Because of design constraints I need to charge a 2S Li-Po battery over its balance connectors using a single-cell charger IC (e.g LTC4002). In order to allow the user to interrupt the charging process ...
1
vote
1answer
870 views

Can I safely parallel 2 separate 18650-based Li-Ion battery packs, each with their own BMS? [closed]

I have a couple of 18650-based 10S2P 36V nominal 4.4Ahr Li-Ion battery packs from my electric skateboard which I'd like to permanently put in parallel to double my range and improve my power during ...
0
votes
1answer
90 views

Can two normal batteries be connected by series and parallel, at fraction of second apart, so as to charge and discharge at the same time? [closed]

Two ordinary wet cell batteries can either be connected by series or by parallel. What happens if I have a contraption that enables these connections to alternate between series and parallel cycles ...
1
vote
1answer
65 views

what size battery storage is needed to provide 10A at 115v for 5 continuous hours

I have a two part question: What size battery storage is needed to provide 10A at 115v (I meant 115v AC) for 5 continuous hours? what size solar array (assuming proper alignment, etc.) would be ...
0
votes
1answer
872 views

How much voltage and Amps to charge a 24V Battery?

If I have two 12V 18A and I whant to charge them in series making a 24V 18A battery. With how many Voltage and Amps do I Need to Charge this 24V without damaging the batteries.
0
votes
1answer
53 views

MCP73831: VBat Voltage drop with new uncharged batteries

I made a circuit for charging a 40mah lipo battery (381018), my problem appears when a new uncharged battery is connected. The battery measures 0V at the begining, when it's conected the VBAT pin ...
0
votes
0answers
29 views

Im making a DIY batttery with laptop batterys.

I'm making a DIY battery for my E bike, from old used laptop batteries. I have seen many videos in you tube about it. I konw that if you put a discharged battery next to a fully charged battery, the ...
1
vote
2answers
431 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 ...
0
votes
1answer
158 views

What is the miminum voltage for series NiMH pack?

Suppose a pack of 8 AA NiMH cells are serially attached and its known NiMH cells should not go below 900mV per cell. Does this really mean the pack should not be discharged past 7.2v?
0
votes
0answers
180 views

Do NiMH demand balancing?

Is it fine to charge a pile of 8 2 Ah AA NiMH @ 11.6 V 0.5 A serially? They are from the same packaging and were bought only for use as an 8x pack - they were not used for anything else. Im not sure ...
0
votes
2answers
65 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
0answers
62 views

battery backup switching

I am working on an appliance project in which I have been tasked with the design of the power supply. The project specifications hold that from a 230v 50Hz wall supply two voltage rails of 5v (for ...
0
votes
0answers
94 views

Battery charger interfacing with 3.3v microcontroller

I'm trying to create a WiFi remote with rechargeable battery power. What I want is very simple: simulate this circuit – Schematic created using CircuitLab I do not want any 3.3v regulator in ...
0
votes
1answer
40 views

Wiring Up a Li-Ion Battery (Band 2)

I have a Li-ion battery that I pulled from a MS Band 2. It comes with a protection chip, which I am having trouble with. The chip has 4 accessible pins, labeled "P+, K, T, P-". I've tried every ...
2
votes
2answers
314 views

Mosfet heating in current limiter circuit

I am designing a lead acid battery charger using Battery University for guidance. This is the circuit I made. The power supply is from an Adjustable 12V power supply. I have set it to 14.4V. The ...
0
votes
0answers
15 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
78 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
45 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
1answer
283 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
56 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 ...
1
vote
1answer
48 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
90 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
123 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 ...
-1
votes
1answer
139 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 ...
0
votes
2answers
52 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
56 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
35 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
29 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
148 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
67 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 ...
-1
votes
1answer
249 views

Connecting 18650 batteries in parallel? [closed]

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
134 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
1answer
32 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
115 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
vote
1answer
134 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
143 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
40 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
59 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 ...