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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).

4
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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
171 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
950 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
542 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
870 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
501 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 ...
12
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 ...
2
votes
3answers
2k views

AA Battery charger and re-chargeable battery

I have a Canon digital camera that requires a 3.2V battery. I'm trying to figure out what would be the impact if i use a re-chargeable battery that has 1.2V capacity. For a similar reason, I need to ...
3
votes
2answers
2k views

How do I smooth out the voltage from a pulse-charger?

I've got a dc-dc pulse charger that charges my 12v lead acid battery. The pulse charger charges for 1 second and stops for 20 milliseconds. My battery is powering some sensitive equipment, what can I ...
27
votes
4answers
136k views

How to measure capacity of a Lithium-ion battery

I bought a Lithium-ion battery for a camera (much cheaper than the brand replacement but non unreasonably cheap compared to AAA Li-Ion batteries with similar charge). I however have doubts that it has ...
2
votes
3answers
346 views

Charging marine battery while powering equipment

I've got a quite delicate setup with a PC and some other minor equipment such as a microcontroller connected to a large 100Ah sealed (AGM) 12v lead acid battery. I need to be able to run my equipment ...
8
votes
4answers
12k views

Are 4xAA DIY Gadget Chargers Safe?

I've found some Do-it-yourself guides to making a 4-AA battery gadget charger, which are basically four AA batteries connected to a cut up usb cable: http://robotification.com/2007/09/15/diy-usb-...
2
votes
2answers
9k views

How and when can solar charge controllers be stacked together?

I run a small business selling solar charge controllers. Often I have a problem with not having controllers rated high enough amp-wise. I know that charge controllers can be stacked. But can all be ...
1
vote
1answer
912 views

Algorithm for balancing LI-PO batteries?

The answers to this question provide a good overview of how a single lipo cell is charged: Algorithm for charging LI-PO batteries? Most chargers that handle lipo packs have a balance mode that ...
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 ...
3
votes
4answers
29k views

What happens if an AC voltage is applied to a battery?

Today I was checking the voltage between charging terminals going to the battery of emergency lantern using a multimeter. The multimeter showed a DC voltage of 9V and an AC voltage of 4V. Could ...
5
votes
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 ...
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 ...
16
votes
6answers
58k views

Is it possible to revive a dead battery by passing a high voltage through it?

I have an almost dead laptop battery and read in this forum that "The problem with most of the broken batterys is that they are exhaustive discharged. the trick to solve this is to give them ...
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 ...
11
votes
5answers
21k views

Charging lead acid batteries in series

I recently bought 2 12V lead acid batteries (AGM type) for my mobile music needs where I need 24V, so I discharge them in series. At the moment I charge both batteries separately, which is a bit ...
3
votes
2answers
3k views

Designing a Battery Charger With a PIC

I've designed the following circuit for a battery charger. With the PIC just turning the output on and off when it is charged. For the program design what would be better, to have the analogue input ...
2
votes
2answers
2k views

Maximum battery charge current by technology

I know the exact values depend on the specific battery used, but is there a general rule for the maximum charge current (as a function of the battery capacity) for each of the mainstream battery ...
2
votes
1answer
1k views

Battery Voltage While Charging

I'm experimenting with a linear-mode fast-charge circuit for NiMH batteries. I was surprised to find that the voltage measured across the battery terminals while fast-charging is higher than the ...
3
votes
2answers
623 views

Lengthen a AC to microUSB phone charger cord?

Can I effectively take a 3 ft standard cell phone charger (AC to microUSB, 750 mA at 5V) and lengthen the cord to 6 ft by splicing the cord or am I going to lose something in the mix? Do I need to ...
3
votes
4answers
39k views

How do I determine the maximum current for charging a li-ion battery?

I have a cell phone that has a 1500 mAh 3.7 V battery. It comes with a 700 mA charger but I've sucessfully used a 1 A charger with no problems. I'm now trying to make my own multi-device charging ...
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.
0
votes
1answer
172 views

Safely detecting lead-acid battey charger output?

How can I safely detect output of a car battery charger? It has a OS/MP switch and for output it lists 12 V and 10.1 A. Unfortunately I have no idea what OS/MP means and I of course have no manual. ...
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 ...
4
votes
1answer
2k views

how to modify a taper charger of lead-acid batteries to be a constant current charger?

I have a huge, cheap and dumb battery charger which can charge a 12 V lead-acid battery with 70A, but it only outputs anything near (by "near" I mean over 30A) that value if I give him a completely ...
11
votes
3answers
27k views

how can I try to revive this AGM deep-cycle battery which started to perform dramatically below specifications?

I have a AGM deep-cycle battery, 150 Ah, 12V: Banner "Stand By Bull" SBV12-150. 12V150AhC20. Up until recently it was working quite OK, I was able many times, for many months, to drain about 170 mA ...
5
votes
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 ...
4
votes
1answer
656 views

Parallel charger circuits

I'm constructing a power supply based on solar cells backed by batteries. The solar cells deliver between 0 and 4 A, depending on the time of day, while the charger I plan on using, the LT3652, has a ...
88
votes
5answers
234k views

Why are there 3 pins on some batteries?

Lots of new batteries (for mobile devices, MP3 players, etc) have connectors with 3 pins. I would like to know what is the purpose of this and how should I use these three pins? They are usually ...
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 ...