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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83 views

Voltage flow to charge a battery

A windmill creates a voltage, to charge a battery do you connect the positive of the windmill to the positive of the battery, or the negative? Why?
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5k views

Can 1.5v Lithium AA batteries be recharged?

I hope this is the best place for this question. I have some Energizer lithium AA batteries (1.5v), that work very nicely in electronics that have heavy constant usage, such as my Apple Magic ...
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3answers
1k views

Charging 4 protected li-ion batteries in series

I have bougth 4 protectected li-ion batteries from e-bay (these). And I would like to know if I could charge them in series with 24V 0.5A charger (this one). Since they are protected I conclude ...
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2answers
54 views

Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...
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1answer
311 views

Charging a car battery with solar panel [closed]

Sorry about the previous format, guess i was a bit confused and in a rush myself, So let me put it this way. I'm like, i have a dc battery and a solar panel which of course produce d.c so I'm ...
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2answers
213 views

Old AMD portable charger [closed]

I found this device in my garage a few hours ago. It seems to be a very old portable charger, but I can't find what it's called or the model: The cables plug into a small jack like so: It uses a ...
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1answer
129 views

How come portable phone chargers tend to use USBA?

How come most portable phone chargers use USBA rather than Micro USB for the output port? Is USBA supposed to be more tolerant? If they use Micro USB for the output (as well), the user could just use ...
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1answer
508 views

Is there a rightside up when plugging in an AC to DC power converter? [closed]

When plugging an AC to DC converter into an AC outlet, does it make any difference at all if the wall wort is "upside down" or "rightside up"? Is there anything about the electrical design that would ...
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2answers
981 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 ...
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1answer
314 views

What Caused Hoverboard Lithium Ion Fires? [closed]

Purpose of this question: In the interest of making my own BMS circuit designs safe and robust, i seek to understand causes of BMS failures in known systems. I'm not seeking consumer advice or ...
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1answer
505 views

How to boost convert a LiPo battery to double or triple its voltage, while still charging at original voltage? [closed]

I have a high resistance load (50k) that I need to pump ~0.2mA across. So basically, I need to put 10V across this load. It's an interesting situation because the voltage needed is quite high but the ...
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2answers
697 views

BMS (battery management system) peak current limit [closed]

I am trying to choose a BMS for a 18s6p lipo battery pack i am building. i am expecting a 180 A discharge current, but most of the options i found had a maximum discharge Current of about 100 A. my ...
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1answer
253 views

Why does the Apple Watch use a wireless charger, even though such a charger works slower than a MagSafe-like wired connector would? [closed]

The Apple Watch includes a built-in lithium polymer battery (a few hundred mAh; slightly more than 3.75 V) which is recharged using a wireless inductive charging cable. The cable does use magnets to ...
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1answer
61 views

Does the drive train of an EV affect the charging speed of the battery? Why? [closed]

In the latest tesla announcement they said: “Paired with the new more efficient drivetrain design, Model S and Model X are now capable of achieving 200 kW on V3 Superchargers and 145 kW on V2 ...
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1answer
135 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 ...
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1answer
182 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 ...
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3answers
959 views

how to charge a li-ion battery with a small amperage?

I have created a power supply which provides 5V and 15mA. My battery (3.7V,520mAh) doesn't charge because this current isn't strong enough,it starts charging from ~150mA - 200mA. But my application ...
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1answer
116 views

3.7 V battery compatiblity?

Can I use 3.7V 400 mAH battery instead of 3.7 V, 520 mAH, 2.00 W ? How much difference it can make ? Sorry not more techical sound here... Thanks !
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1answer
251 views

Which better charge method for 12v 10w solar panel to 2x 6v 4.5ah battery?

i have 12v 10w solar panel and 2 x 6v/4.5ah battery. Im planning to build control that charge 12v battery (in this i series 2x6v battery) and after i read this Do batteries in series equalize charge ...
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3answers
2k views

Battery Charging circuit problem

I want to charge a 3.7v battery of 3000mAh. I am using the battery charging circuit based LM317(from internet source) I have connected the components by supplying input voltage of 9v and while ...
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1answer
393 views

Equal charging of new and old battery [closed]

I am using four "12volt" batteries of 150 amp hour each, for a 24 volt solar backup system of ouyback things since four years. Now i add 4 new batteries of same capacity to increase the backup time ...
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1answer
69 views

Rechargeable battery, power multiplexor and charging battery

I have a Raspberry Pi and a bunch of peripherials (web cam, WiFi dongle, H-bridge + DC motor, servo). Alltogether they consume ~4.5A when everything is active. And I would like to make this device ...
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2answers
424 views

external battery claimed iPhone 6 charges versus my calculated charges mAh vs Wh and voltage step down confusion

I did a charge on this page and could not find the answer I was looking for. Perhaps it was over my head, or perhaps I was using the wrong search terms, so here goes nothing: I am trying to ...
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1answer
7k views

Charger specification of 3000mah battery

I am planning on making a USB charger for my Tablet whose battery is of 3000mah. What should be the output current and voltage required for the charger? Is there anything else other than the output ...
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1answer
6k views

Can i Use a 19v Charger for 10.5v Netbook [duplicate]

Possible Duplicate: Choosing power supply, how to get the voltage and current ratings? I just lost my netbook charger and am now using my laptop universal charger for it. The charger is supplies ...
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1answer
1k views

Can I use my Android tablet charger for the PlayBook? [closed]

I got a BlackBerry PlayBook and it came with the wrong charger plug. It's for the US that I can't use here in Germany. Can I use my Android tablet charger for the PlayBook instead? The information ...
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1answer
438 views

Charge LiFePO4 Cell using Arduino and a MOSFET

I want to charge my LiFePO4 cell with the following schematic. simulate this circuit – Schematic created using CircuitLab The arduino provides a PWM signal, which goes to an isolated MOSFET ...
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1answer
76 views

problem with LM338 to charge phone

I used a module using LM338 to charge my phone with 2 pices of AA rechargeable battery I set it to 5v with 2A current and connected to phone but the phone was hanging on the same percentage or even ...
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1answer
34 views

Ubuntu Battery Check [on hold]

Today morning my laptop wasn't turning on but charging light was on.later some how i able to turn on my laptop.Can be this Battery Problem? Bc i put it on charging for hour. Here is stat.
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1answer
41 views

DC-DC charging different voltages

I have several banks of batteries on a boat, two larger banks 48v electric propulsion system with regen 12v house bank Each has a charging source the 48 has regen up to 2kw while sailing The 12 has ...
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1answer
1k views

Replacement of li po battery with li ion battery [duplicate]

Is it possible to replace a battery for headphones? I would like to replace a 052030 li po battery with a Nokia BL-5C Lithium Ion battery. The li po battery is rated at 130 mAh with 3.7v. The Lithium ...
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1answer
195 views

Can I pull ampere out of transformer as I want not as my circuit need?

I have transformer with max ampere 20Amp, If I tried to charge 12V battery with it, it gives 2Amp..I want to do something that force transformer to gives 10Amp for example...Is that even possible? ...
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3answers
341 views

grounding a moving robot

I'm am designing an external battery pack for a robot, Pepper, a robot by Softbank (I'm am not making the battery itself but the circuit connecting two batteries). I am going to connect a 25V (LiFe-...
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2answers
57 views

What determines the current drawn by phone battery? Phone (load) or charger or both? [closed]

What actually determines the current drawn by phone battery? Is it the phone battery (load) or the charger (supply)? For instance, the charger that came with my phone reads 1.5 A. Also, I have two ...
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2answers
2k views

How many batteries are required for a 3.5 kVA inverter?

I am planning to buy a 3.5 kVA small industrial inverter, but I am not able to figure out how many batteries are needed for that. Please anyone help me out with details.
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1answer
145 views

charging one battery and discharging another battery simultaneously [closed]

I have two 12v 7.2ah lead acid battery. The initial voltages of the first and second are 12v and 8v. If I connect four 5watt 12v led lamps to the first and a 100w solar panel giving approx. 12v to the ...
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1answer
1k views

Homemade battery power bank safe? [closed]

My micro-usb port on my phone is no longer functioning. So instead of buying a new phone or waiting weeks for a cheap battery power bank to come in from China (stuck for cash), I was thinking of ...
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1answer
225 views

Is it bad to charge an iPhone 5S with an iPad Air's charger? [closed]

Often in the little leaflets that come with chargeable electronic gadgets, manufacturers state that you should only use the original supplied charger to charge the gadget. We all know that an iPhone ...
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2answers
114 views

Hybrid cars - are they good [closed]

I hope this is not too much outside this forum, but... Up to now - and recently more frequently, I see advertising and promising talk about the new breed of hybrid cars and all-electrical cars (like ...
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1answer
3k views

calculating the battery amperes to connect with UPS?

I have 500 watt UPS, which outputs 220v and 50Hz. The calculation says that I need 500/12v = 41.67 Ampere and 12v battery to use with this UPS. But mostly people around me suggested 120A/h battery. ...
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1answer
331 views

Is my battery indeed has 12 cells/7800mAh? [closed]

I've ordered 12 cell 7200mAh battery for my notebook HP HDX18t. When I received the battery it says 14.4V/7800mAh ( and not 7200mAh like it was stated). 1 - According to this site the number of ...
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1answer
3k views

How high charging temperature causes damage to AA size NiMH cell

I used a portable thermometer and put on top of a battery charger. I notice that the temperature reach 39 degree Celsius and I can feel the warmth when I put my hand on top of the charger & the ...
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votes
1answer
34 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 ...
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1answer
5k views

Car 12V battery: swap lead acid to lithium ion [closed]

After observing battery voltage gauge on my car, I can see my lead acid battery operate voltage is from 11.8v to 14.8v. The car is about 5 years old, and while start/stop, the car drains the lead ...
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2answers
166 views

Charging 4x 18650 Li-Ion Batteries in series [closed]

Hello StackExchange community. So i have been for a long time wanting to build someything portable and recharchable with the 18650 batteries. the only problem is i cant find any good guide on how to ...
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1answer
81 views

Hack smartphone IC to draw more current and allow higher voltages? [closed]

Disclaimer: This is just a laboratory experiment I am willing to do at my own risk. I understand the risk of blowing up the phone (GT-S5280) pr charger (Powstro 30W charger). I already have a water ...
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2answers
90 views

Connecting a 20 amps battery charger to an 18 amps source [closed]

I have an inverter with a 20 amps DC battery charger (AC to DC ). I need to a connect the ac Generator output to the ac input of the inverter. The thing is that the generator can provide a maximum ...
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votes
1answer
57 views

Recharge electronic cigarette battery [closed]

My electronic cigarette broke the power button but the battery is still new. I have another one that has the button working. The battery is like the one in the picture below, and I wonder if I can ...
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1answer
6k views

How many hours would a 38000 mAh powerbank will last? [closed]

i bought a 38000 mAh powerbank and to my surprise when I could only use it for a total of 6 hours and then I have to recharge it again. My battery's capacitu is 1 700 mAh. By the way I'm taking up ...
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2answers
170 views

Calculate ampere using volt? [closed]

Can we calculate the output ampere of a battery charger by calculating battery voltage over time: 1. Get volt value name it volt1 2. Wait a second 3. Measure volt again name it volt2 So would the ...