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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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 ...
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1answer
646 views

Why did I fry my lab power supply trying to charge a lifepo battery?

I hope the question is not off-topic: I want to know "why" it failed more than how I should use my equipment, even though the questions are probably linked. The power supply is a 0-3A, 0-30V lab ...
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2answers
3k views

Measuring the charge of a battery while charging

Determining whether a 12V car battery needs charge is as easy as touching its leads to those of a multimeter. While charging from a vehicle's alternator, the multimeter method fails to determine the ...
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Is charging an empty Li-Ion cell to 50% more or less efficient than charging it from 50% to 100%?

Many devices that are powered by a Li-Ion battery can be recharged over 5V DC supplied by a USB connection. Is the 5V voltage internally converted by the charging logic to something lower, and is ...
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866 views

Detect if connected battery is rechargeable

The device I am building can be powered by USB or 3xAAA batteries. While connected to the USB, the device will charge the batteries. But before charging the batteries, the device needs to make sure ...
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1answer
9k views

12V Battery charger voltage - cycle use

I need to charge 12V e-scooter battery with DC-DC converter. Specification of the battery charging voltage is: Standby use - 13.5V - 13.8V Cycle use - 14.4V - 15.0V Can I charge the battery in cycle ...
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1answer
805 views

Building a High Current Power Supply? (Odd Voltage)

I'm working on a project involving some custom LiFePO4 battery modules. They can take a very high current charge, and I'd like to take advantage of that. I have battery management and charge ...
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4answers
15k views

What can be the consequences of charging a lead-acid battery with an excessive voltage?

In my field-operating device I use a simple PWM step-down to charge a 6V 3.9Ah lead-acid battery from a 5W solar cell with a voltage of 7.2V. Unfortunately the DC regulator got damaged today and the ...
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1answer
23k views

Battery management circuit for Nokia BL-4C / 5C Li-ION batteries

Nokia BL-4C / BL-5C are 3.7V, 700-1000mAh (variants) Lithium-ion batteries, which are available in abundance and at very low cost ($4 - $7 a piece), since these are used in entry level Nokia phones, ...
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Charge a single AA battery in a double charger?

Most cheap AA battery chargers charge two batteries at a time. Many devices use 1 or 3 AA batteries, meaning it's difficult to make sure you've always got two compatible batteries in the charger. My ...
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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 ...
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1answer
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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) ...
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3answers
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Charging High Cell-count LiPo batteries

I have a question about charging and balancing a 10-12 cell LIPO battery. I have been searching around for an all in one solution chip but come up empty. I have also found out that there are almost ...
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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 ...
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4answers
855 views

Charging Batteries from DC Bike Generator

I have salvaged a motor from a treadmill to make a stationary bike generator. Motor Specs: 180 VDC -4500 Rpm 1.3 Hp 6 amp I mocked up a bike trainer and using the rollers from treadmill and was able ...
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1answer
281 views

TPS61200 gets really hot

I have a problem with a battery booster/charger circuit, that I really can't figure out and I hope that somebody can help me. This is the circuit: When i connect a 3,7V battery at X3-2 and X3-2 the ...
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2answers
5k views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
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3answers
2k views

To pulse or not to pulse

It is accepted practice to maintain lead acid batteries at a float voltage of roughly 2.3 Volts per cell. The precise value depends on battery type and battery chemistry and ambient temperature. We ...
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How do cheap phone chargers charge li-ion batteries?

I read about li-ion battery charging and it requires monitoring for the voltage and current, How does those extremely cheap phone chargers do that? Or Is it just an adapter and the charging circuitry ...
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3answers
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Why isn't my battery charging?

I have a YT7B-BS battery in my motorcycle. My motorcycle doesn't start because the battery voltage is only 12.05 Volts. The battery has the following inscriptions: Standard charge: 0.7 A x 5~10 ...
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1answer
850 views

Unable to understand Drone's LiPo battery capacity loss

I have ruined a 3S LiPo 5400 mAh and I am unable to understand the reason. This is directly related to my earlier question which was about same battery. I bought a new balance charger and put the ...
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5answers
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What to plug in first to usb charger when charging: wall outlet or cell phone and why? [closed]

I asked this question on Physics StackExchange but was advised to ask it here. When I charge me cell phone or notebook or whatever device what should I plug in first? Should I at first plug in usb ...
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How can we understand portable battery for mobile phones having 10000 mAh capacity, and 6200 mAh “nameplate capacity”? [closed]

In USA, I always see portable batteries for mobile phone stating they have 5000 mAh, 10000 mAh, or 13000 mAh, etc. (One of the popular one is Anker as on Amazon.com). However, in Asia, I saw the ...
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Solar watering system for greenhouse [closed]

I wish to build an automatic watering system for my greenhouse and I would like to get some advice on how to do it. Here is a sketch of the greenhouse system: What I have right now: Solar Panel (...
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2answers
544 views

Is Non-Passive Cooling bad for Lithium Ion Cells?

I'm in the process of designing a device capable of charging, discharging and testing internal resistance of 18650 cells. My device will be capable of testing 100x 18650 at the same time, each will ...
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1answer
727 views

Will it hurt a non-powered power supply to see 12/24V on the output?

For an RC (mostly LiPo) battery charging setup I've got a 48V Meanwell AC->DC PSU supplying power to the charger. I'm considering simple ways to power the charger either by this PSU or directly by a ...
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5answers
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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 ...
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2answers
891 views

Safe Lithium Battery Management

I'm building a device that needs to run from Lithium batteries. I am well aware they need to be charged/dis-charged properly to avoid damage and explosions. To my knowledge a charging system has ...
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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 ...
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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 ...
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1answer
322 views

Coulomb Counting vs Joule Counting?

Is there any benefit to measuring joules in a smart battery in addition to/instead of coulombs? I'm currently integrating: ...
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2answers
279 views

How can charge be determined?

How can software determine the amount of power or charge left in a battery (like an iPhone battery or a laptop battery)?
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3answers
7k views

What resistor (or indeed do I even need one)?

I have a device which charges a built-in AA battery. The factory AC/DC adapter outputs 200mA at 3v. This adapter has died one me. I have another one lying around with the correct-size plug that can ...
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2answers
1k views

Are there any dangers to consider when replacing a permanent AA NiMH battery?

The battery in my electric razor has failed to charge for several years. It does not turn on unless I leave it plugged in for 20 minutes and it turns off immediately if I unplug it. To save some money,...
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2answers
23k views

How do I avoid overcharging a battery?

I've got a solar panel (12V, 330mA, 2W) which I will use to charge a (12V 5Ah) lead acid battery. I'll put a voltage regulator and shottky diode in between the two. However, could overcharging become ...
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2answers
2k views

Designing 14.8v Li-ion battery charger + 5v power regulator for Raspberry Pi (of other 5v device)

The RasPi requires a steady 5V and to this end I build a power regulator circuit using a LM2576T, similar to the one on page nine of the latest MagPi magazine. This works great with an external ...
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1answer
5k views

Smart charging circuit for NiMH battery pack

I want to build a solar powered charger for a niMh battery pack to run a microcontroller. What are the fundamentals of building a smart circuit that will not overcharge the battery and will also allow ...
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1answer
134 views

Li-Po battery ritual when using first time

We are using lithium-ion polymer battery in our project. The battery manufacturer recommends that battery needs to be fully charged and discharged for four times before usage as to reach its maximum ...
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2answers
3k views

How to fast charge a Lifepo4?

Disclaimer: I hope that I have not carelessly overlooked a previous post that answers this question; but I definitely have tried, and still find myself a little lost. Situation: I have 15 A123 ...
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1answer
1k views

Solar powered charger circuit for a single LiFe cell

I'm looking for a solar powered charger circuit for a single LiFePo cell. The load is a low power MCU with some sensors attached, and when sufficient solar power is available, it should be used to ...
4
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1answer
702 views

Dual smart battery design and PCB layout

I have a system that is powered by a 7.4V Lithium-Ion battery. The system, which is a combination of processor module and sensors, draws a varying amount of current at varying voltages (5V, 12V, -12V, ...
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1answer
2k views

Charging batteries connected in series as isolated groups

I put an electric motor into my 30' sailboat to propel it. I'm also using 8x12V Deep Cycle Marine Batteries to create 48V system (4 in series twice, connected in parallel) I have a 24V Wind Generator, ...
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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 ...
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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 ...
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3answers
1k views

Light an LED when load is in circuit

I want to have a LED light up when a load is in circuit, and go out when it is not. Initially I set the circuit up so that the LED is in series with the load but this didn't work. I think possibly ...
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2answers
988 views

When to read Battery voltage and battery current during charging

I am using a micro-controller to drive a buck converter for Li-ion battery charging purpose(Micro-controller providing PWM to the buck converter). During charging the battery's current and voltage ...
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2answers
626 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
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1answer
543 views

Switched or linear charger IC for lead-acid battery - which one to pick?

What is the difference/practical consequence of using switched vs. linear charger controlling ICs and which one should I choose? I understand that the switched regulators/chargers use a PWM while the ...
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2answers
3k views

Solar cell trickle charging lead-acid without charge controller

Can somebody comment on sizing a solar cell for trickle charging a lead-acid battery bank without a charge controller for several months? I found a non-authoritative source that claimed that cells ...
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1answer
853 views

Would it harm a LiPo to charge it in several periods?

I have a 3.7V 5000mAh Lithium-Polymer battery cell, which I'm charging with the MCP73831, using the typical application circuit on page 1: I have \$R_{prog}=2\text{K}\$ and \$V_{in}=6.0\text{V}\$. ...