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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).

5
votes
2answers
8k views

Charging a 12.6V 3SLiPo from 5V USB (Or similar) voltage?

So, I understand that a 3Cell LiPo battery can output 12.6V when fully charged and that the cells must remain balanced to guard against Fire/Explosions/and general bad stuff happening. However, each ...
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 ...
3
votes
3answers
624 views

How can I measure the charge of a rechargeable cell?

I'm using a bluetooth keyboard which need four AAA batteries. After the cells are charged (at least according to the charger), the keyboard still doesn't work properly; there is a green LED that ...
2
votes
2answers
2k views

Will this power supply fit my LiPO charger? [closed]

I just got my brand new LiPO battery charger. It is require 12 volt pover supply. I saw people are using car battery, pc power supply to this charger 12 V. but i'm not sure about current it is ...
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. ...
-2
votes
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 ...
2
votes
3answers
6k views

Using car charger for small sealed-type lead-acid batteries

I want to charge a couple of small (1Ah 12V) sealed-type lead-acid batteries. I have a Bosh KL 1204 car battery charger. The charger's nominal current is fixed at 2.3A, while on my batteries it is ...
2
votes
3answers
5k views

How can I charge my beard trimmer's Li Ion battery from USB?

I have just bought a beard trimmer with a built-in Li ion battery. The charger that comes with it says its output is "4.2V, 600mA". I know Li ion batteries will misbehave (!) if fed the 5V from USB. ...
10
votes
3answers
1k views

Is there any sense in this technique for charging Li-Ion batteries?

This is a replication of this question on Android SE. I feel that it is in fact an electrical engineering question, since it covers batteries behavior in details. Basically there's a claim that the ...
17
votes
2answers
9k views

Why battery chargers take a pair of batteries and not one?

I have a number of AA- and AAA-sized NiMH rechargeable batteries ('accumulators'). All the chargers I encountered allow to charge 2 (4, 6, 8,..) such batteries at a time, but never a single battery. ...
3
votes
1answer
8k views

recharging zinc-carbon batteries? (if an “AA R6P” is a zinc-carbon anyway)

Opened up one bike light from china that charges via a USB port (5V, .5A) and inside, the rechargeable battery is a barely labeled "R6P AA size 1.5vols 0% mercury". besides that only engrish, brands ...
0
votes
1answer
219 views

MCP73834 disintegrates after a couple of hours

For my first attempt at Li-Po charging I chose the MCP73834-FCI/UN for availability, it has an output current of 1A. I set it up the example circuit in the datasheet and used an 6Ah battery to test it....
4
votes
2answers
1k views

Garmin Gps Battery Modification

I recently bought a GTU 10 from Garmin. I want to extend it's battery life by replacing and soldering on a new battery and enclosing the battery and the GTU 10 in a 1601 Otterbox. I would like to be ...
2
votes
1answer
2k views

Li-Poly battery charger with protection - Schematic review

I need to build a Li-poly battery charger. The intended schematic of the circuit is as follows: J1 is connected to the battery. PMOS connects and disconnects the load to and from the battery IC ...
0
votes
1answer
19k views

Why don't my rechargeable AAA batteries work in my cordless phone? [closed]

I'm trying to replace the AAA batteries that came with my BT cordless phone, as they are terrible quality and have quickly degraded (they now only last about 20 minutes after full charge). They are 1....
4
votes
2answers
2k views

Charging affects battery life?

I wish to understand how a battery charger may best be designed in order to maximise the life of Lithium Ion batteries. I have specified Lithium Ion batteries as they are what is used in most laptops ...
10
votes
4answers
12k views

How is fully charging a Li-Ion battery in 35 minutes possible?

I happen to own a power drill/driver that runs on a Li-Ion battery and ships with a charger that charges it fully in 35 minutes and claims to charge it to 70% in 15 minutes. According to answers to ...
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 ...
3
votes
5answers
60k views

How much energy can be stored in a battery?

Can any one tell how much energy can be stored in the a single battery (12v) ? If I want to store 10 kWh of energy then how to calculate the number of batteries required. Editing notes: power -> ...
3
votes
1answer
1k views

How to build a USB charger circuit that can switch between the USB and the battery power automatically?

I'm building a PCB that will have a circuit that recharges a Li-ion battery from the USB power. The board should also be able to be powered both when it is draining power from the battery and when it ...
0
votes
1answer
2k views

48VDC SLA charger from 12VDC supply design help

I am in the process of designing a 48 VDC (comprised of 4 x 12 VDC) lead-acid battery charger, with an input voltage of 12 VDC. 1W - 2W output is sufficient, and relatively high efficiency with low ...
2
votes
0answers
303 views

What is the usage of 3rd lead in mobile batteries [duplicate]

Possible Duplicate: Why we have 3 pins on some batteries? I'm trying to build (DIY) open charger for mobile battery. I would like to know what is the usage the middle one? Is there anyway I ...
0
votes
1answer
8k views

Boost circuit using UC3843-IC

I would like others to explain how to make an buck or boost circuit using UC3843-IC. I am constructing a solar power supply, that can be setup as an alternate power source so that it can be fed to ...
-1
votes
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 ...
7
votes
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 ...
5
votes
1answer
11k views

Can I recharge batteries with a normal AC to DC transformer? [duplicate]

Possible Duplicate: Charging 3 AAs in series My batteries charger is not working, but I have an AC to DC transformer that can output different voltages. If I connect two 1.5v (rechargeable) ...
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? ...
25
votes
3answers
4k views

Why do batteries recover after a load is removed?

I carry a small 2-AA flashlight, and a few times, I have accidentally left it on in my holder. Each time it dies completely, so that no light is emitted, but if I turn it back off and wait for a few ...
4
votes
2answers
8k views

Effect of Battery charging with un equal batteries in parallel

I have 24 VDC to 220 VAC Inverter and two 90 Ampere Batteries now I feel that backup is not what I need now I intend to connect these two existing batteries in parallel to give total of 12 volts and ...
0
votes
1answer
169 views

Charge board timer conditions/disabling - mcp73213

Datasheet for MCP The MCP73213 has a built in timer. In the datasheet it states the typical timer elapsed values are 0(disabled) 4, 6, and 8 hours. The conditions column is empty. I need to ...
2
votes
1answer
5k views

LiPo series charging

I have a 3 cell lipo connected in series and I want to charge them without removing them from circuit. I only have single cell chargers so I can only charge one at a time or charge them in parallel ...
3
votes
2answers
5k views

Why do chargers heat up when operating?

From my experience all chargers for Li-Ion batteries notably heat up when charging the battery. Why does that happen? Is the charger acting as a not that efficient power supply or is there any ...
2
votes
3answers
3k views

Direct Connect Solar Panels to 12v Chargers (for misc electronics)

Can I safely connect 12V solar panels directly to electronics that have a 12V auto charger? The "Car charger" essentially contains the electronics necessary to regulate the voltage from the solar ...
9
votes
2answers
940 views

Properly charging and discharging Lithium cells during battery testing?

I'm working on some software that automates charging and discharging battery cells to generate discharge curves. I have a few concerns about properly charging and discharging of lithium-ion / lithium-...
4
votes
5answers
2k views

A Battery Charger which can extend LEAD ACID Battery life

I am making a battery charger for a 45AH LEAD Acid Car Battery. That I will use with 100 W (1 A 100 V AC) UPS. I need to know that what things I should keep in mind so that the battery charger ...
0
votes
3answers
5k views

How to make two isolated power sources from one source?

I need to have two electrically isolated power sources. Here are the details of the application: http://revolectrix.fmadirect.com/support_docs/item_1377.pdf page 26: I need to make this work with a ...
11
votes
2answers
14k views

Floating multiple sealed lead acid batteries in parallel

I know with multiple lead-acid batteries you should really charge them separately so that one battery doesn't try and charge another and waste power. But that holds true for the main charging process....
16
votes
2answers
4k views

How fast can a Li-Ion battery be charged?

So far I've seen many Li-Ion battery chargers that do the full charge in about 1,5 hours or more. There're also NiMH battery chargers that claim they charge a NiMH battery in 15 minutes and then the ...
1
vote
2answers
2k views

3.7V Rechargable battery as arduino power supply

I have an arduino and a telit GM862 module which requires 3.4V-4.2V power supply. So far I have constructed a 12V limiter to plug it into a car power supply and a step-down converter which converts ...
3
votes
2answers
1k views

charging a lead acid battery

(n00b question) I have a small (6 cell regular bike) leadacid battery and want to charge it via solar sheet of 15V - 0.3A. the voltage solar sheet changes and in cloudy day goes below 10V. does the ...
2
votes
1answer
540 views

Is there a mathematical relationship between the battery AH rating, and that of the transformer in the charger

I'm possessed of an inverter battery (12v 150AH rating) that has been out of service for a few months now. The reason it was out of service is the inbuilt charger provided with the inverter was not ...
0
votes
2answers
869 views

schematic for battery and solar cell in parallel

I have a thermometer, that the sender uses 2 batteries AA (2 x 1.2V). I would like to add a solar cell to use it to load the battery. I tried to connect both (battery and solar cell in parallel) with ...
2
votes
1answer
2k views

Safe operating area for different types of battery chemistry?

I'm trying to find the safe operating area for various types of batteries; in particular I need minimum and maximum termination voltages, although information on temperature / power / current is also ...
9
votes
2answers
5k views

“Breaking-in” lithium polymer batteries:Is there any research on that?

Well I just got new batteries for my RC glider and I'm thinking about what to do with its battery. For those who aren't in the RC hobby the story goes something like this: New kid buys a battery and ...
1
vote
2answers
500 views

Wall transformer amperage

I have a battery charger that uses a 24VDC 300mA wall transformer. The transformer died, and the closest replacement I could find was 24VDC @500 mA. The new transformer did seem to charge the battery ...
5
votes
1answer
4k views

Dirt cheap NiCad charger

So sharptooth has a question up for creating cheap charger units that uses battery packs to charge a phone: Is designing and producing a dirt cheap charger really that hard? My question is the other ...
11
votes
5answers
10k views

Parallel charging of lipo batteries, maximum voltage difference?

There are numerous products that enable lipo batteries to be charged in parallel. Most sources are clear on voltage and capacity requirements, which follow pretty directly from basic circuit ...
16
votes
2answers
4k views

Can I safely trickle charge a 24v garage actuator battery with a pair of 12v solar panels?

I have a Hormann Promatic Akku Garage door actuator, since my garage doesn't have mains electricity. Generally speaking I'm very impressed with how well it works. Unfortunately while it lasts around ...
4
votes
2answers
13k views

Induction charging for diy projects?

I have in the back of my brain a project involving wearable "transponders". These would be worn around the neck like a lanyard or a piece of jewlery. For simplicity, they should be able to charge by ...
2
votes
1answer
9k views

Feed a “solar” charge controller from AC->DC power supply?

In considering a DIY UPS-ish system (small bank of AGM batteries and an inverter), I knew I wanted/needed a charge controller, but most I found were just intended for keeping e.g. car batteries topped ...