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).

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6k views

Can i charge a 3.8 volt lithium battery with a 5 volt usb or charge cube? [closed]

I did search and read a lot of varying opinions on this site, I'm just trying to get a straight answer. I have an ordinary 3.8v Lithium cellphone battery. I have a USB charging cord for it, but I ...
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2answers
2k views

does a booster affect the battery capacity of a circuit? [closed]

will using a 3 to 5V booster IC affect the power capacity of the battery i use in my circuit? as in, will it consume more power?
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3answers
83 views

Power a Micrcontroller Using a 12 Volt Battery

I have a solar panel that is charging a 12 volt battery through a charge controller. The battery is used to apply voltage to a pump. I would like to use the battery to power the micro-controller. What ...
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1answer
98 views

11.1 LiPo battery lead got too hot and shows 0 voltage now [closed]

I was working on my project using the LiPo battery. I mistakenly connected the battery terminals + to - and - to +, due to which the leads become too hot that it give me a heat shock. The charge in ...
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1answer
3k views

How to increase watts ? out of 12 volt?

I am making a project, a DIY so please co-operate I don't know much about electronics the overall project needs some electric combinations... I have a rechargeable fan with built-in battery but I am ...
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2answers
230 views

Would replacing a 35 Ah battery with a 100 Ah battery damage the alternator?

I have an Elemax SH7600ex generator that came with a 35 Ah battery for the electric start system. That battery has died, and I've replaced it with a 100 Ah battery that I had lying around. The ...
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1answer
559 views

Lead-acid battery charging [closed]

Have an unbranded lead-acid battery charger and a small 6Ah 12V battery. After about a year of purchasing the set I need to charge it for the first time. For car battery jump start I vaguely remember ...
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1answer
953 views

Charging my laptop with a universal adapter [closed]

My laptop charger's adapter recently died, and as a new one of its kind was very expensive, I got a universal one for free (here is the model, I couldn't find a link in English though). The charger's ...
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1answer
51 views

Do I need the battery to be present if notebook connected via Car Universal Laptop Power Adapter? [closed]

I am going for holiday and I want to use my old old Acer. The battery lasts for about 10 mins if not connected to the electricity outlet. If the notebook is connected via Car Universal Laptop Power ...
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2answers
42 views

BQ2057WSN Charging issues

I have designed a battery charging Module using BQ2057WSN IC to charge a 7.4V,6600mAH Li-ion battery. According to my calculation the charging current is set at 625mA. The input power source to the ...
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1answer
31 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
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2answers
860 views

What are good alternatives to the dw01a used with TP4056?

Currently I have a 18650 battery charge and discharge circuit in my Board design as a "Emergency fall-over power. And I have some problems with it. First problem I see is that while the battery is ...
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1answer
49 views

Is it possible to charge a mobile phone powerbank using a 12 v motorbike battery and if so how? [closed]

I want to find a way to use a 12 volt motorbike battery to charge a mobile phone powerbank. Anyone knows if this is possible and if so how to do it?
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1answer
2k views

Battery charging current of simple inverter lead acid battery

I want to know that what is the maximum charging current of any simple inverter connected to a lead acid battery. Just like 150 ah lead acid battery. What happening if 25 amps of charging current is ...
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2answers
445 views

How will it take to charge 36V 4Ah battery using a 5V 2.4A Solar Panel?

I'm an electrical noob (don't know the right formula to use for this calc) I have a 36V 4Ah battery and a mini solar panel that puts out 5V at 2.4A. How long would it take to charge the battery? ...
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1answer
536 views

How to charge lithium ion battery? [closed]

I have purchased and received this battery from eBay. Upon opening it delivers 3v as oppose to 12v-10v and it has a petty output current. I am going to assume this is because it has not been charged ...
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3answers
648 views

2 cell lipo battery or single cell with step up

I am trying to design GPS tracker controled by chip from arduino with GPS/GSM module sim808. I need to power it from lipo battery and i need 5V input for the chip which can give up to 2A peaks. What ...
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2answers
319 views

Bulging batteries on a Nexus 4 [closed]

I have a Nexus 4 phone, which had battery issues, and the battery was replaced by a no-name battery from ebay. After about two months, the battery swelled/budlged out (to the point that the backside ...
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4answers
2k views

Battery mAh meaning

What exactly does mAh rating means? I know that it means the milliamperes supplied by the battery in one hour but i need a more conceptual and practical definition/example. How does mAh rating tell ...
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2answers
518 views

Charging a smart phone battery

I want to make a simple battery powered development board for my AVR's but the problem is that the regular 3.7v batteries or very big in size, so I decided to use a smartphone battery from one of my ...
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2answers
249 views

Battery with solar panel power supply

I'm developing a module with integrated battery, where the power supply will came from a solar panel. Solar panel is this one -- 5.5V - 90mA Battery is this -- 3.7V - 1200mAh My device is a Sensor ...
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1answer
1k views

Transferring battery energy form phone to phone [closed]

Is there a way to transfer the battery energy form a phone to another phone? I've seen it be done by using a USB to microusb adapter + USB to microusb cable like show in this video. Can I create an ...
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1answer
130 views

simple USB charging

I have a battery project that i want to charge via USB at around 300mA. If just using a wall wart then everything is easypeasy, but I want to make it compatible with a computer as well. What I've done ...
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1answer
404 views

Switching between batteries while charging

Let's say I have a 4 A current source and two 12 V car batteries, connected in series (with a tap in the middle). What in your opinion is the simplest MOSFET switching circuit, that would allow me to ...
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1answer
183 views

Portable 1A battery phone charger

I want to make a little battery-powered portable phone charger with 2x AAs that outputs 1A. I have seen similar USB powered battery chargers such as the Mintyboost but it only outputs 500mA. For 1A ...
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1answer
511 views

How long will my battery last under this load and with this source?

I need to calculate how long my battery will last until it is completely discharged. I have a load that will draw 154 uA at 1.8 V for a power of 277.2 mW. Assuming that this is running indefinitely ...
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1answer
2k views

What do B+ and C+ mean on the wires of a Lifepo4 battery pack?

I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery. There are 4 cables coming out of the battery: C+, C-, B+ and ...
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1answer
25 views

cordlell battery/charger

I am converting my cordless drill to corded. to do this I need to use the charger which slides on the battery to attach to the damaged tools sole plate. I made a connection between the drill motor ...
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2answers
235 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 ...
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2answers
78 views

Electric Vehicle Charging [closed]

I have a few queries related to EV charging: (1) When we refer to 'X kW' charger, is it that the charger is taking in X kW power and delivering power = X kW times the efficiency of the charger to the ...
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1answer
49 views

How do i make sure the battery is charging in the simulation? [closed]

Here is the schematic from "Parasitic Power Harvesting in Shoes,IEEE,1998" ,and i add a button cell battery(the blue one) to let the PZT charge it(battery). So i have to simulate it to make sure the ...
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1answer
97 views

Some devices deliberately throttle charging input?

Powerbank I have an 50Wh “Hama Pipe” powerbank with 21W output power (2×2.1A ports OR 2.4A+1.8A), which would equal 4.2A at 5V in total, minus resistance. But the input power is only 2.5W, which ...
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1answer
200 views

Is it possible to charge a li-ion battery with brushless motors?

Can I charge a li-ion battery pack with the help of extra brushless motors(with a rectifier) attached to the front wheels of my electric skateboard. Will it work? Anything that I should know before ...
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1answer
2k views

Is it ok to use a 10 years old set of NiMH rechargeable AA batteries? [closed]

I've just found my 10 year old pack of rechargeable NiMH AA and AAA batteries. The AAA ones are completely blown with a dark powder all over their positive terminals. The AA ones look fine when ...
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1answer
2k views

Add batteries to solar powered garden fountain

I have a garden water feature powered by a 15V Photo-Voltaic array. The PV array powers a low voltage DC pump. Obviously, the water feature operates only when it is sunny. It starts to run when the ...
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1answer
100 views

NiMH battery charger - purchased module or homemade? [closed]

I would like to get to a cheap way of charging NiMH batteries. Are there any suitable modules that could one purchase or should I rather focus on creating one at home? What are the pros and cons of ...
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2answers
153 views

voltage measurement of a charging battery [closed]

I have a 12v battery Which supplies power to a system. The battery is charged from a solar panel . so as to ensure the protection from over charging the voltage of battery is to be measured regularly....
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2answers
208 views

Can a 3 stage charged battery bank be used to quickly charge a drained battery bank?

I am considering this idea. For a 36V golf cart application, I want to be able to quickly charge it (but not to 100% State of Charge (SoC)). The idea is to give the 36V bank a strong boost in ...
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1answer
91 views

Solar Charge circuit verification

I am designing the solar charge controller which will charge 12v battery and will also protect it from over charge and dischage and will also control load. I searched a lot of articles on google and ...
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1answer
139 views

How to calculate battery charging voltage [closed]

I have a battery with 80V and 700Ah. Please tell me is their any method to calculate charging voltage to charge this battery. Please need your help.
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1answer
493 views

Back emf (I think) is causing voltage surge - how to reduce it? [closed]

In putting together a 24v charging system on an engine driven generator that didn't have one fitted, I connected a 24v bulb between a switched connection and the output of the generator in parallel ...
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1answer
452 views

Need help how to backup cellphone… i need output power 5v 1a from AA battery

How do i get the amount of 5v 1A for my backup battery for my cellphone unit? from 4pcs of AA battery(each batt is 1.5v 2500mAh) to 5v 1A been searching for a while ago 1,is it better to use a 7805 ...
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2answers
285 views

how long charge li- ion battery [closed]

I have \$3.7V\$ Li-ion battery \$3800mAh\$ and Solar panel \$U=5.5V, I_{max}=290mA\$. Battery will supply arduino with sensors taking \$100mA\$ current. How long will it take to charge the battery ...
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1answer
2k views

Can I Charge a 12V Battery While It's In Use? [closed]

I have a Time-Clock (Where employee's check-in and check-out to track working time). Currently set up like this: 12V Adapter >> Time Clock So whenever that 12V adapter loses power, the time clock ...
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1answer
874 views

Designing 12v DC UPS

My requirements are: I need a UPS system which supplies power to a 9 volt modem. UPS should Charge 12v battery (SLA , charging curent 800ma), and it should have overcharge/discharge protection system [...
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1answer
292 views

Circuit for charging 3.7 volt battery using a motor rotated mechanically

I took a 5 volt DC motor, and tried to rotate it at its maximum speed by hand. During its rotation I measured the voltage at the motors i/p wires. It comes out to be 4.5 volts. Now I want to use this ...
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1answer
134 views

Summer camp project questions - bike charger

For a summer camp, I am building a bike-generator. Well I have found a few articles about that on the internet, but I have put together a list of questions and I would be really appreciated if someone ...
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1answer
322 views

What is the difference between Pack- and Bat- on a LiPo Battery

I am trying to figure out how to use the TI bq34z100 to measure the charge in a 29.6v 8s1p 5.4Ah pack. Out of this pack I have A charge connector with + and - and a discharge connector with + and - ...
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1answer
140 views

Adding AC adapter to solar powered device

I have a solar-powered LED number display whose rechargeable batteries have apparently died. I'd like to hook it up to AC power using a 3V adapter (i.e., cutting the leads from the batteries and ...
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1answer
1k views

Making an extended Battery Pack + Charger for a Tablet PC

I want to make a battery pack with mains charger to power my tablet that has a wonky battery. It lasts all day if I do not use WiFi, but with WiFi it dies within the hour. I have 4 Nokia BL-5C 3.7 V ...