Battery charger Definition and 38 Threads

I want to buy a car/motorcycle battery charger because it's a very convenient thing to have. Also, for a while, I have wanted to have a simple power source like shown. How safe is it to use it to charge lead-acid batteries from cars or motorcycles? I know the simplest option is to buy the...

I've got an electric toothbrush which is rechargeable, it had been regularly used and charged for years until one day it didn't charge. I immediately thought that the toothbrush was failing but at the end of the day I found that it was the charging stand failing, the toothbrush was fine. But I...

I need to build a battery system to drive a 10 HP pump motor. The actual BHP varies as the pressure in the system rises, but for the most part we are operating at a 10.1 brake horsepower. Run time requirements will vary from a few hours to many hours. I settled on 8 hrs as a basis. Motor...

I've replaced the charger for my DeWalt tools several times, and now I may have to go out and get a fourth one. One of them flashes a fault warning (steady slow flash), the other two do not light up at all. Now, I do not take care of my tools. All three of these chargers may have been exposed...

I was told once that two 1 amp tv type diodes parallel will not work because one will always carry the load, but I am working on a car 30 amp battery charger and it has 6 diodes 1/2" press in type all parallel same as from a 10DN series Delco alternator from the 60's where they used three...

My cheapish 12V battery charger suffered an overcurrent, and now is not working properly. Below is a schematic of the main power side: The MOSFET M1 will not turn on, which I'll tackle later, but even with the drain bridged to source the voltages are wrong. The black, slow charge (rail at...

I have a question that I believe requires knowledge on the graduate level, but I can't necessarily express it in terms more complicated than plain English. If this is not so, moderator, please adjust to your taste, and thank you! If it helps to know this, I'm an audio/video systems designer and...

Hello I drive for a truck company and am getting tired of being charged for idling my truck to keep my batteries from depleting. I have a 2000w inverter now that's hooked to the truck. I had the idea of putting a few deep cycle batteries and charging them somehow with truck inverter or outlets...

I have a ton of 3.7 volt lipo's at my house, each of which can be charged @ 5C, and since each have a capacity of 270 mAH, than I should easily be able to charge them @ 1amp. I put 8 in parralel with each other so it is a 1s, 8p battery pack. each of the lipos is the same (in tems of specs, ik...

So I want to charge a battery from a pedal-powered dynamo, and use that to power my PC, my screen, and pretty much everything else in my home office. This whole thing is a little project to improve my own health while I'm working; I'm not here expecting to make major miracle savings on the...

I'm sorry if this isn't the right place for a shopping question, but I'm not sure where else to go for advice. I got a https://www.amazon.com/dp/B0094KM4VK/?tag=pfamazon01-20 on sale and the unit is great, but the batteries don't hold a charge very well, especially when using rechargeables - it...

Hello, I'm planning to light up a tile chess board with 64 LEDs (blue and white) set between the tile squares, and I was wondering if this Class 2 Battery charger output: 12VDC 900mA, would work to power 16 parallel sets of 4 LEDs + 1 ohm 1/8W resistor and a SPST toggle switch? The current...

Hello I need a source to power ADSL router when the electric power would be cut for any reason because i need to keep my laptop that i use for work connected to the internet. I found this "Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable External Battery Charger with 9V/12V...

Hi I need a circuit to charge 4 aa lithium ion batteries. I need it to charge at 5 volts and when the batteries are done charging, the circuit cuts off. It would help a lot if I could get this in a small space around 2 quarter's. Thank You.

I just got my hands on a solar battery charger with a set of usage specifications that makes me believe it will only be useful some four days a month and will take more or less such time to charge a single set of batteries, despite promises on the contrary in the instructions. Since the case is...

Hi, I'm working on a project to build a solar powered AA battery charger. This is definitely not my profession, I only have a small understanding of electrical engineering. Mostly from what I learned in high school electrical class. Here is what I'm looking to do: I want to charge 16 AA...

A friend of mine lost his battery charger for his airsoft gun and he naturally comes to me for electrical help. Problem is, I'm freshmen level right now. I looked up how to hack and build a basic battery charger, my question is do the internal resistance/impedance of the batteries matter when...

I want to build a usb charger that works with solar power (and later add a crank dynamo too). The photovoltaic cell will charge rechargeable batteries and they will charge the usb device, like my smartphone. The smartphone charges with 5V and 1500mAh. I'm planning to use 2 AA batteries 3.4V...

I'm thinking about all types of charging (LiIon, lead acid, etc.). I get the basics...but would really enjoy more info on the subject. Also...one thing that confuses me is how you can "overcharge" a battery...and how you can supply too much current (amps) to the battery. Since its generally...

Hello, I want to use a DC permanent motor as a generator in order to use it to charge a battery. This generator will be rotated by hand. The speed is varying as it rotates by hand. I would like to know what is the circuit that I could use it to charge 12 V chargeable batter? Best wishes,

12 v 7 ah battery charger urgent hello everyone i am getting stuck with 12 v 1 amp adapter and with 12 7ah smf leada acid battery . i give supply from adapter to battery through 1n4007 and then from this batttery to my microcontroller kit. by this my batteyr get charged and kit gets supply...

I have built a battery charger for a cordless drill. It works fine, however, I would like to add an LED indicator to let me know when the battery is fully charged. I'm getting tired of checking the voltage across the battery all the time to see if the thing is charged. I'm not picky on how...

I have a Ford Escape Hybrid. it is a 330v battery with about 1.4kw of capacity. Currently there is no cost effective after market charger. Also my location in NYC does not allow me a "plug in" option. I had an idea on how to access the battery pack to charge it, but I wanted to know if...

hi I want to design a 4 cell (16.8V) lithium ion battery charger. The normal chips available have built in buck (reall buck or synchronous buck) or at least control circuitry for buck with external mosfets. This is necessary as wall adapter/source input voltage are higher and unregulated...

I'm designing a battery charger consisting of an LM317. The regulator will charge three batteries successively, for example, when battery 1 reaches a terminal voltage of 13.8, a voltage comparator will activate a relay that will switch on the second battery while switching off the switch for...

What happens if re-chargable batteries are left too long on their chargers? is there a fire risk? do some of them such as the ones used for moble phones and chordless power tools have some sort of cut-off safety mechanism?

Hi i embarked on a project to design a battery charging system using an alternator, an electric motor and a battery all connected in a closed loop. The battery powers the electric motor and in turn the electric motor powers the alternator and finally the alternator charges the battery. My...

Homework Statement To recharge a 5V battery, a battery charger must move 7x10^6 C of charge from the neg. to pos. terminal. How much work is done by the charger in joules? Homework Equations QV=U The Attempt at a Solution If the battery needs to be recharged, isn't the potential...

Dear Experts, I am fascinated how a cell phone battery charger knows when the battery is fully charged such that it cuts off the power to prevent further charging. If its based on sensing a particular voltage has been reached, i wonder how is that achieved? Or is it achieved by measuring...

Not asking for a schematic, more a notion of roughly how challenging this will be.

I have little idea on how a battery charger works but i'll just state here what I think is the case and then state my queries. When you receive an AC input from the mains there is first a step down transformer which lowers the voltage - then there is some regulation and it is converted to DC...

i am intersted in the end of charge detection(-deltaV) on some NIMH chargers, i would like to test that effect on some chargers. I got some chargers(like GP Smart power bank, GP H500,etc...),all the chargers i have use the drop of voltage as end of charge detection, so what i did is, I...

Hi, can someone tell me what are the optimum settings for a charger to charge a 24v 12ah Lead Acid Battery? I know that the voltage stays the same. I just need to know what current will cause the faster charging and, at the same time, won't destroy the battery.

moe in wichita ks i have a old battery charger, about 15 years. it is for charging 2 or 4 ni-cad AAs, 500 ah, for a radio control car. input 120/60 9w. out put 5.8 volts 500ma dc, charge time 1 hr. my Q is can this charger work on ni-h batterys? thanks

Homework Statement http://img2.freeimagehosting.net/uploads/bf073a5eb1.png http://img2.freeimagehosting.net/uploads/bf073a5eb1.png Determine the variable resistance R if the 25 Watts to be absorbed by the battery (0.035 ohm resistor and the 10.5 V element). Homework Equations V = IR P =...

There have been a few posts about wireless power transfer here on PF, so some of you may find this useful. I came across this post in another forum about designing a wireless battery charger. The author gives a rather through description of what's going on and why he's doing certain things...

I have a car battery charger (for 6 or 12 volt batteries), that I don't know for sure if it works or not. I want to use it for a power supply in an electrolytic cell, so I decided to test it out to see if it worked. When I hook it up and plug it in, nothing happens, the needed doesn't jump on...

hi i wish to build a battery charger using a 3/4hp240voltac motor driving a 55amp car alternator will this work has anyone done this before and will my caravan batteries be oka i have a gen set to drive the electric motor all these questions i hope to be reveled rolly