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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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Why don't electric car manufacturers use multiple chargers to handle high current charging?

I just read an article describing the multiple problems which occur when you're trying to increase the electric current transmitted through an cable to charge the battery of an electric car. These ...
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11 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
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51 views

Power supply switching circuit design

I am trying to design the power supply needs for my project. It has 2 loads in parallel, one 12V and one 5V. I want to power it from as 12V Wall Adapter that will drive my 2 loads and charge the ...
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25 views

BMS for charging 1s 10p 18650 batteries? [on hold]

I have a 1-series-10-parallel 18650 battery pack. I would like to use BMS to charge them but which type of BMS is suitable? I couldn't find an exact 1s10p BMS module.
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1answer
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Operating Voltage and Current of solar PV panel connected directly to a battery

Let's assume we have a 60 cell 260W PV panel with the following STC characteristics: Voc= 38.1V Isc=8.98A Vmpp=31.1V Impp=8.37A The panel is exposed to direct sun light and standard conditions are ...
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2answers
104 views

Planned obsolescence / failure of consumer electronics / kill switch [on hold]

General question for those who have worked in the consumer electronics industry: Are small rechargeable devices (like bluetooth audio devices specifically) designed to fail after a set time to force ...
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52 views

How to diagnose a lithium ion battery charging circuit [on hold]

(I am a digital guy, VLSI and programming - always avoided the analog) It has a 4 pin 3.8V 16.49Wh lithium-ion battery. The power supply to the device is a USB 5V 1A adapter. Observations: Unit ...
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0answers
30 views

Wireless electronics and keeping their batteries charged [on hold]

I have a number of wireless electronic gadgets (e.g. wireless gamepads and Nintendo 3DS). I did not have time to use them recently (e.g. did not use 3DS for more than year) but nevertheless keep them ...
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1answer
46 views

Does voltage drop with discharge?

Does voltage drop with discharge? Since voltage is the potentiality between two charges to re-balance (from my understanding). I mean, once all charges are equally shared between both capacitor ...
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0answers
25 views

Challenges to DIY a USB QC 3.0 charger for a DJI Mavic Pro @ 13V?

One of the big pain points with all of the DJI Mavic Pro drones is that they do not charge via USB. In order to charge the batteries you have to buy an AC-DC adapter which adds a good amount of extra ...
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52 views

What is the energy loss when charging a phone battery with another battery [on hold]

I'm curious to find out what the energy loss is when an external battery pack charges up another battery, say one in a mobile phone. Say my phone's battery has a capacity of 1000 mAh, and my external ...
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1answer
69 views

TP4056 and li ion battery charging that never ends

I have designed a circuit with a Nodemcu ESP8266 (something similar to an arduino nano, requiring 3.3V to work) and I would like to have a backup battery to be robust to main power interruptions. So ...
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1answer
9 views

Is a bq2920x enough to protect a two-cell Li-Ion battery?

I'm designing a battery supply to go into a bluetooth speaker. Having never worked with Li-ion cells before, I've done some research and understand that they need to be load balanced and protected ...
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2answers
28 views

5V output on AAA Ni-Mh battery charger?

I bought a cheap Ni-Mh battery charger from Aliexpress to charge my rechargeable AA and AAA 1.2V batteries but before I plug them in, I checked the voltage on the charger terminals and it is reading ...
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1answer
62 views

Battery voltage drops to 0

I have this type of battery. When it was fully charged I read with the multimeter aroud 38-39 volts. Now I read 21 volts. The question is: When I connect the battery (discharged - 21,22 v) to a bldc ...
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1answer
48 views

Minimalistic RTC backup battery charging or a super-capacitor?

I am trying to provide RTC power backup for a 3.3V system that will be running at the very least 8hrs during the work day. As such I only need up to a month of backup, enough to survive over long ...
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1answer
40 views

replacing PSP battery with a larger LiPo cell [closed]

I've been gathering information regarding replacing a standard PSP battery with a much larger lithium polymer pouch battery, but I've heard conflicting information. The standard method is to remove ...
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1answer
36 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
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2answers
95 views

Why does my laptop emit electromagnetic radiation when charging (only)? [on hold]

I have an electromagnetic radiation detector that I've been playing with recently, going around the house and testing various appliances, and I noticed something weird. When I charge my laptop (or ...
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2answers
46 views

Piezoelectric Project

I am currently working on project involving piezoelectricity and I'm in need of some advice. I'm pretty much a beginner, but I've been doing lots of research. I just need input to help fill some gaps. ...
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0answers
19 views

Battery sizing for UPS

I want to do battery sizing for a UPS rating. 200 kVA Load PF – 0.9 Inverter Efficiency – 96% Max DC Voltage – 580 V Min. DC Voltage – 440 V Back up time @ BOL – 15 mins (Confirm back up time ...
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0answers
46 views

Can a rechargeable NiMH battery be replaced by a non rechargeable battery

I am looking to change a Toshiba laptop rtc battery as the current one is no longer working. The current battery is a 2.4V 40 mAh NiMH connected to the laptop via a 3 pin connector with only 2 wires, ...
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1answer
36 views

How do I know if TP4056 charging modules are faulty

I've bought 10 of TP4056 Lipo charging modules from a Chinese vendor. Tried using them in something I've built, but whenever I plug the power source in, the charge led doesn't light up. In fact it ...
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1answer
41 views

SMPS Current Sense Resistor Selection

I am looking into using an SPV1040 boost converter to charge a battery from a solar cell. The chip includes inputs for a current sense resistor, which are described in one of ST's applications notes ...
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1answer
27 views

How can I measure the charge current into a smal LiPo battery?

I have a SparkFun USB LiPoly charger that by (default) is set at 500mA. If I try and measure the charge current with my DIY multimeters, the charging LED goes out and the meter reports zero current? ...
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1answer
37 views

Automatic charging and power switch between USB and LiPo battery

I am designing a board which can be powered over USB and includes the use of a LiPo battery along with its charger circuit. When the USB is connected, it charges the battery as well as powers the ...
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0answers
28 views

CMOS RAM battery backup charging circuit for retro computer

I've got a few retro computers that use rechargeable batteries to power a clock or CMOS RAM to preserve settings while the machine is off. Most batteries were already dead, and to prevent damage from ...
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0answers
10 views

Maximum battery bank capacity chargeable with a 2000W inverter generator

Using a 2000W inverter generator, what is the maximum capacity of a 12V battery bank that it is capable of replenishing if left on constant charge? In theory I assume that at 12V, a 2000W generator ...
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0answers
18 views

Why in consistent current for multiple TP4056 module in parallel?

I'm trying to make a charging station that charges multiple batteries independently, something like so. NOTE: THE POWER SUPPLY IS AN ADJUSTABLE BENCH POWER SUPPLY, I ACCIDENTALLY LEFT IT AS 1V. ...
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2answers
110 views

Two 5V2A powerbanks draw different current under same conditions?

I have 2 different powerbanks, both have 10000 mAh and both are rated for 5V 2A power input. I have noticed that they draw a different amount of current despite using the exact same charger (5V 3A), ...
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1answer
27 views

Increase working hours for an external speaker

I have an external speaker which uses one 18650 cell (3.7V). I would like to increase the working hours by adding one more cell of the same type. I have two questions: Should I add the second cell in ...
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1answer
49 views

Using B0505 for connecting phone chargers in parallel

I am planning to charge four 18650 Li ion batteries that are connected to four TP4056 in parallel making 4 amps in total to charge them in their usual rate. I was thinking of connecting two 2 amp ...
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0answers
39 views

Can I connect one 18650 Batteries group/case to two Charger boards (PCB Power modules)?

I can connect one charger board (PCB Power module) such as link to one 18650 batteries case such as link1 and link2. (ignore the link2's example has one charger module already). But my question is ...
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2answers
32 views

How to enable battery management IC

The TI's battery management IC BQ2403x have the chip enable signal which needs to pull up when working. There are four potential power sources to enable this CE signal which are: AC, USB, BAT and ...
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0answers
57 views

Simple way of keeping a 12V backup battery charged

I'm designing a simple alarm system and I want to add a 7Ah lead-acid battery as a power backup, but I don't want to go to the trouble of getting an expensive battery charger/monitor. If I just want ...
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2answers
51 views

Stored LiPo battery voltage going up

I have an 8s8p LiPo battery with a fully charged voltage of 25.9 V and 25 Ah. This battery was used to run a brushed DC motor (rated current 1 A) using a motor driver circuit (which I assume helps ...
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2answers
68 views

Charging two 18650 batteries in series with a 5V USB wall charger?

I'm looking for a good and space-saving solution to charge two 18650 batteries in series. The project is a small boombox, using an amplifier board that works with voltages between 4.5V to 25V. The ...
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1answer
18 views

TP4056 to charge xS1P li-po li-ion

Very related to this question. While it's already clear that several TP4056 can't be used to charge and discharge several cells, it's not clear to me if it's possible to only charge a battery pack ...
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1answer
68 views

DC converters for solar cell

As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve) This just ...
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1answer
56 views

Li-ion battery pack from non- identical batteries

I'm building a battery pack for my portable speaker, and I'm using a random collection of second hand Li-ion cells. I'm going to have cell phone batteries with differing capacities and also 18650 ...
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1answer
25 views

Can I charge each Lithium ion battery, that are connected in series, with individual charger?

I don't know if I can do this and just want to make sure that it can work before I actually test it so that I don't have to worry about blowing my room up... The batteries have the same capacity so ...
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1answer
35 views

Using 12.0v 2.0A charger on 7.2v 1.5Ah No Li-Ion Drill

Someone lost the charger, I have a 12.0v 2.0A charger on 7.2v 1.5Ah No Li-Ion Drill What are the risks? Thanks
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1answer
23 views

Battery Charger output based on input Voltage

If a charger is rated at input 230 V 50 Hz and output 3V 100 mA, is given an input of 220 V, how will it affect the output charging current? Will it be lower than the rated output current or higher?
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2answers
58 views

Does minimizing full-charge time for Li-ion batteries increase their longevity? [closed]

If the stock charger for my smartphone causes the Li-ion battery to be charged in a couple of hours and I charge my phone for 8 hours a day (while I sleep) resulting in about 6 hours of full-charge ...
1
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1answer
50 views

Battery first time charging duration

Why does some manufacturer which I know using NiMH battery in their products recommends to charge the product for like 24 hours the first time you charge it, yet the seller usually tells to charge ...
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2answers
35 views

Li-ion CR2 / 15270 voltage and charging circuitry

CR2 / 15270 Li-ion batteries normally come as 3.0v. I thought Li-ion and Lipo batteries were always 3.7v, how is that possible? Does it require a different charger circuit than normal 3.7v li-ion/...
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1answer
28 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
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0answers
41 views

What is this “Termination Disable” pin?

I'm just looking at the BQ2407x range of Lithium-Ion charging ICs. One part in the range has an extra pin, TD, which disables/enables "charge termination". Here is the functionality description: ...
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1answer
82 views

Battery advice re cooking equipment

Please go gentle as I am a novice at electronics/battery issues. I am hoping someone with a much bigger brain than me can answer this question... Is it realistically possible to power a 1200W ...
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1answer
41 views

What is the proper procedure to charge a lead acid battery?

and thanks in advance for your answers. I have a 12v 6Ah lead acid battery, and have been instructed to charge it using a configurable power source. They told me I should use a float charge, ...