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 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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4answers
12k views

Calculate battery state of charge percentage

What is the correct formula to calculate battery state of charge percentage based on the battery type (12v, 24v, 48v and so on) and the current battery voltage. For example if I have a 12v battery ...
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1answer
625 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
79 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
45 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
3k 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
593 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
3k 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
147 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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2answers
119 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
228 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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1answer
4k 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
336 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
76 views

If fast charging a device causes the lithium battery to drain faster, why doesn’t that apply to Tesla super chargers? [closed]

Some iPhone chargers are 'fast' chargers which deliver more than a single amp and charge the iPhone faster. Tesla Superchargers are known for charging a battery fast as well. But since charging ...
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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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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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4answers
30k views

Can a phone charger be adapted to charge a laptop battery? [closed]

I've obtained a laptop that has no charger. Short of buying another charger online, can a phone charger be adapted to charge the laptop's battery, provided it's disconnected from the laptop (i.e., the ...
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1answer
6k 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
363 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
105 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
98 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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1answer
58 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
172 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 ...
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1answer
347 views

Battery capacity calculation/method [closed]

While calculating battery power capacity requirement for a circuit consisting of multiple loads having different power consumption, how should one proceed to avoid any error? How it is done in ...
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1answer
81 views

Can I use a general purpose Microcontroller to charge a lithium battery [closed]

This is new hardware hacking for me. I get hat there are charger IC’s, but I Wanted to know if I could program a standard Atmega or PIC microcontroller to help me learn how to charge a battery?
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1answer
6k views

Large 10 kWh 18650 Lithium-ion power pack - What configuration? [closed]

I need to build a 10 kWh lithium-ion pack, anywhere from 70 V to 200 V. This is to drive a motor. Power output will not exceed 15 kW. The cells will be Panasonic NCR 'B' at 3.4 Ah 18650. I would ...
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1answer
1k views

Can I use ATX as a cell phone charge station? [closed]

Can I use ATX with few "DC-DC LM2596 Step-down Adjustable Power Supply Modules" to make a cell phone charge station?
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2answers
461 views

Which resistors to use for high current (10A) voltage-divider? [closed]

I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply. I have an AC (220V 50Hz) to DC (27V 10A) ...
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3answers
154 views

plugging battery against the power supply [closed]

This may come across as a rather nonsensical question however I think it is worth asking simply to understand what happened. I plugged in an electric car battery directly to a wall socket, almost ...
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1answer
151 views

charging electric car battery through road - grounding? [closed]

Alright then, hi all. For a Mobility Design Master Thesis Project I want to charge an EV battery through the road while driving. I just can't get to grips with this. I'm slightly frustrated, don't ...
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1answer
395 views

Charging balance with 2 batteries: How is kitchen aluminium foil dangerous despite same voltages? [closed]

If 2 batteries of the same kind are connected to each other, the battery with more charge, thus higher voltage, will charge the one with less capacity. A standard NiMH battery charger uses 1.3V to 1....

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