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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).

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1answer
7k views

How to make a balanced battery pack?

I am making a robot for my workplace right now. I started with a 20servo kit. It came with a really terrible 10.6volt, 800mAh NiMh battery pack though. I would like to make a lithium pack for ...
8
votes
1answer
630 views

Could I double the batteries for double the usage time?

If I were to double the exact same battery of a particular device (noted below), could/would that effectively ~double the device's usage time (more or less)? For reference -- There's a motorized ...
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votes
4answers
8k views

How to cut power off when a certain voltage from a sensor is reached?

I've built a simple Ni-Cd charger (basically a 0.1C current source) for some 1300mAh cells, that I want to stop when a certain voltage is reached on the cell. I tried to design the switch with an Op ...
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votes
3answers
71k views

What should the voltage of a fully charged lead acid battery be?

I don't have a proper lead acid battery charger... But I own a small Yuasa 7Ah battery. I am using a 13volt 1.5A wall wart to charge it. And I have a volt-meter to check the voltage. At what ...
8
votes
4answers
3k views

Harvest power from an electric fence

Many farms use electric fences to discourage animals breaking through to neighbouring paddocks. These electric fences have regular (say once per second) high-voltage spikes of between around 100 V ...
8
votes
1answer
7k views

Rechargable power for arduino

What is the best way to provide rechargable power for an arduino based portable device? So far I've found the following options: 1: Use removable batteries and include an external charger with my ...
8
votes
1answer
11k views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
8
votes
1answer
12k views

Arduino Runing On && Charging NiMH batteries

I have a project I'm working on that will have an Arduino running on 2 or 4 rechargeable NiMH AA batteries. I say 2 because I might boost up the voltage to what's needed. My problem is that this ...
7
votes
3answers
13k views

How does a battery recharge?

Alright, I should probably know this, but I don't. For a school project, I need to be able to charge a 12v battery from an alternator. What I am stuck on is the method of how batteries (generally ...
7
votes
2answers
199k views

Are AA battery and 18650 battery the same? [closed]

I have an Antex SZ004W0 wireless soldering Iron which uses three 1.5V, AA batteries, but I don't know if it supports rechargeable batteries. I know that it supports non-rechargeable battery named "...
7
votes
1answer
3k views

What component of my phone charger produces chirps and how does it do that?

My Nokia cell phone is charged with a very lightweight compact charger similar to this AC-15 (can't find the one I actually use). While the battery is close to empty the charger works silently - just ...
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3answers
2k views

Short time-scale coulomb counting

There exist many coulomb-counter chips which measure the integrated current going into or out of a battery for purposes of estimating the charge state. Are there any good chips for easy circuits for ...
7
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1answer
2k views

How to recharge a battery with a manual battery charger

What are the best practices for recharging a 12V lead acid battery with a manual recharger. I have a 12V lead acid battery (7.2AH/20HR MK ES7-12 (PDF)). I've read the advice here on how to check the ...
7
votes
3answers
7k views

Alternative recharging methods for a toy car

Question: I would like to know about alternative recharging methods for a rechargeable toy car. Synopis I have the Fisher Price Shake n Go Xtreme car and track set. The cars are problematic in two ...
7
votes
1answer
2k views

Charging two lead-acid batteries connected in series, separately (with two solar panels)

I have two lead-acid batteries connected in series to produce 24V. They are powering an audio amplifier. I'd like to be able to charge them while they are powering the amplifier, with solar panels. ...
7
votes
1answer
14k views

Understanding LiPo charging / protection circuit

I'm in the process of learning to design PCBs and understanding electronics design. For a project, I need to charge a 3.7V LiPo battery. I also want to protect it from over‑charging / over‑...
7
votes
3answers
6k views

What is the reason this USB battery charge circuit will not work without a diode?

I have a single cell, ~2100mAh rated Li-Ion battery. Something like 18650, I have taken it out from a laptop battery pack. I want to make a simple charging circuitry for it since I will use it in the ...
6
votes
3answers
38k views

Extending the backup runtime of a UPS with an external car battery

I'm looking for a simple/inexpensive way to have a longer power backup time. My fist thought was putting 2 cheap UPSes in parallel. But I quickly found it's not that simple. You would need another ...
6
votes
4answers
5k views

Algorithm for charging LI-PO batteries?

What is the algorithm used in charging lipo batteries? From watching my charger, I see that the amperage is close to the maximum specified (i.e. what I keyed in) at the beginning and gets smaller as ...
6
votes
2answers
851 views

Batteries in Series

i have 39 batteries of 33Ah 12V connected in series, i need to add 3 more batteries. may i add 3 more batteries of 40Ah 12V in same series? what will happen technically? kindly advise.
6
votes
3answers
8k views

Appropriate charging current for parallel 18650 lithium cells

I have 9 18650 cells salvaged from a laptop battery. They have all been tested to work and since they were always used together, I put them in parallel. I'd like to make a power pack, so I got some ...
6
votes
3answers
5k views

Regulating AA to 5V and achieving high efficiency

I'm trying to regulate a single AA battery to 5V for charging a USB device. I know even at perfect efficiency, it won't provide much juice (1.5v * 1500 / 5v). But what is the expected efficiency for ...
6
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6answers
34k views

Charging Li-ion batteries in parallel

I wanted some opinion on my set up here, just to make sure I got the basics right. I have a Li-ion battery charging circuit based on the MCP73113. This is designed to be a single-cell battery charger....
6
votes
2answers
8k views

Can the terminal voltage of a lead acid battery be reversed?

I recently acquired a used riding mower. I figured it was dead, so hooked it up to a trickle charge overnight. Next morning, still totally dead. I stuck my voltmeter on it, and measured -11.8V. Check ...
6
votes
4answers
4k views

When using a Laptop, is it desirable to keep it charged from the Mains all the time?

While using laptop I usually plug in my Laptop charger (i.e., from Mains power). What is more effective - to keep Laptop plugged in at all times when possible, or some other approach (e.g., running ...
6
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2answers
219 views

Can the negative impact of mixing new and old batteries be mitigated?

Mixing old and new batteries is bad. But there are various options how they can be mixed, and I guess there are use cases in which certain ways of mixing can be justified. In my off-grid solar ...
6
votes
1answer
2k views

Solar powered single cell LiFePo4 charger circuit

As a follow-up to this question I've come up with this schematic for a solar powered battery charger: Subcircuits, from left to right: Solar cell (just a voltage source), 12V, 10W. Buck regulator ...
6
votes
2answers
842 views

Is it possible to detect battery chemistry?

I'm looking at making a universal battery charger. And I am interested in seeing whether I can get it to detect the chemistry so if a non rechargeable had been put in it won't charge.
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votes
3answers
38k views

Charging 12v batteries with direct connection to 20v solar panels

I want to charge a 12v Sealed Lead Acid car battery off of a solar panel (20v) and then draw about 10-20W of power from it via an inverter (the load). I'm wondering if its okay to connect it ...
6
votes
2answers
1k views

Limit the current being absorbed by a battery

I have a generator that supplies a constant DC 10A current to a NiMH battery pack with 240 cells in series (nominal voltage of DC 288V). This current is too high for any cell once it has reached 100% ...
6
votes
1answer
1k views

Lithium Ion Battery Charging Practices

I'm curious as to what recommendations can be made concerning charging routines for a typical lithium ion battery found in a device like a cell phone. The primary goal I have is to maintain the usable ...
6
votes
2answers
13k views

Add a rechargeable LiPo to Arduino micro project

I'm somewhat confused by the various options, hoping someone can clarify which breakout board I need. I want to build a prop that drives a bunch of Neopixel sticks. It should: have a rechargeable ...
6
votes
3answers
10k views

How related are NiCd and NiMH chargers?

I have a device with integrated NiCd charger. Would it be feasible to modify it to work with NiMH batteries? If necessary, I'm ready to rebuild the whole circuit. Also what are main differences ...
6
votes
2answers
14k views

Multiple charge controllers on the same solar panel

I have two 12v lead acid batteries on my boat. One at the front for the trolling motor (~80 AH) and 2 smaller batteries in parallel at the rear for electronics (~30-35 AH combined). I want to put a ...
6
votes
2answers
6k views

3.3V Power Failover Supply with USB Li-Ion Charger

I am currently designing a "3.3V@500mA Power Failover Supply with Integrated USB Li-Ion Charger" for a uC project. I want the circuit to draw power straight from USB power when available & switch ...
5
votes
4answers
19k views

Building a Battery Charger with an LM317

I was told that i could make a simple battery charger from a LM317 and a resistor to charge some Ni-MH Batteries. Can someone just expand on this a little such as how it works as I don't really ...
5
votes
2answers
1k views

Logging lithium battery discharge: why this curve?

I'm using Arduino to log the discharge curve of a 5V battery pack (usb type for smartphone recharging). Using Arduino I read the voltage every second and I save it to a log file. Arduino is powered ...
5
votes
3answers
7k views

Circuit for recharging Li-ion Polymer Battery

I have a Li-ion Polymer Battery (Apple 616-0550), 3.7V 3.44Wh (~930mAh) salvaged from an iPod Touch 4th. What do I need to know in order to build a recharging circuit for this type of battery? ...
5
votes
2answers
1k views

what does “70A moy/arit 90A eff” on a high-current automotive lead-acid battery charger mean?

I have a huge (28 kg mass) automotive high-current battery charger, and its current delivering capabilities are described like that: 70A moy/arit 90A eff What do ...
5
votes
3answers
2k views

Easiest way to find matching li-ion cells (3.7V, 18650)

I recently acquired 50 used li-ion cells (18650). I'd like to efficiently determine which cells are good matches (i.e. which cells have similar: capacity, charge times, & discharge times) so that ...
5
votes
1answer
5k views

Li-po Charging circuit question (switching between battery and power supply)

I'm building a circuit containing a Li-Po battery and a battery charging chip. I do understand the working of the chip, but don't really get how to switch the system load to a normal power supply ...
5
votes
1answer
6k views

Lead Acid Battery Charger Design Factors

In any lead acid battery charger how does the per ampere rate of the battery being charged factor into the design. I think. You have to worry about the current voltage, and the current current being ...
5
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2answers
3k views

How to prevent over-charging a battery?

I'm trying to figure out how to prevent over-charging a single AA battery off of a 1.5V / 200mA solar cell. I guess this comes down to asking how to determine whether or not a battery is fully ...
5
votes
3answers
2k views

Can I draw power for a component while this charger is charging the battery?

So I am working on a design for battery-heated wrist warmers. My mother has Reynauld's and arthritis, and as winter approaches it gets much worse. My basic design is that I will take a form-fitting ...
5
votes
1answer
2k views

Why Trickle Charge a Deeply Depleted Li-Ion Battery?

I'm looking a this to write my own charging algorithm (really not looking to re-invent the wheel here) and have been referencing this article: http://powerelectronics.com/site-files/powerelectronics....
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2answers
2k views

Is it just me, or is charging via usb not as good as using an outlet?

I used to charge my phone during the day at work with a USB cable (plugged into my workstation). Obviously USB doesn't provide the same amount of juice as an outlet so it took all day to charge but ...
5
votes
3answers
479 views

microamp constant current sink

I'm trying to put together a constant current sink circuit for discharging small Lithium-Ion coin cells. I need to be able to sink from about 200 uA to 12 mA. My first thought was to use some voltage ...
5
votes
1answer
6k views

Adding a battery backup to a circuit with external power supply

I want to add a LiPo rechargeable battery backup to an existing RTC circuit, but I can't alter the preexisting circuit. Basically, the regulator, D2 and RTC (Existing Circuit) are all fixed and can ...
5
votes
2answers
4k views

How to charge Polymer Lithium Ion Battery that comes with the Lilypad Development Board

There is a Lithium Polymer Ion Battery that comes with the Lilypad Development Board from Sparfun. Does anyone know if the battery charges if we plug in the battery to the Lilypad Arduino and connect ...
5
votes
2answers
9k views

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

I have two TP4056 modules (with protection circuit), which I am using to charge two batteries respectively, off a single power line. The modules are the ones that have charge output (B+/B-), and ...