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Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

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61 views

Aluminum-Ion Supercapacitor?

I have recently come up with an idea. I was just wondering if this is hypothetically possible in any way. Is it possible to combine aluminum-ion battery technology with supercapacitor technology? My ...
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92 views

Parallel connection of old and new gel batteries

I have a battery system shown in the picture, 6 parallel branches of 4 batteries connected in series. The first 3 consist of old batteries which are 2 years old, the fourth branch consists of 1.5 ...
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647 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...
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16 views

Context of Li-Ion MnO2 “Cell Configuration” Specification

My application supports variable pack configurations: 4S4P, 4S6P and 4S8P. Each one obviously uses a different BMS profile, and other minor changes such as charge/discharge MOSFET and fuse selections....
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194 views

DIY 4S Li-Ion battery pack

I am in need of some help designing my battery pack. I have a few concerns, mostly around charging. My plans consist of using a microUSB boost converter to bring the voltage to 16.8V for charging. ...
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63 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
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127 views

How separators prevent electrons from passing through

Separators (polymers) in batteries keep electrons from passing through but they let ions through. How do they do that if electrons are smaller than ions? Can we imagine it as a kind of 3D wire mesh ...
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303 views

Lead-Acid Battery Desulfation Circuit Design:

I'm seeking ideas for making a pulsing lead-acid desulfation circuit design. Several circuit designs are available via Google image search, however, I'm hoping to get some help here to design a ...
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1k views

UL Testing for low voltage battery powered devices

Is UL Testing needed for a 3.6 V battery powered device that is totally enclosed in ABS platstic with no electrical terminals outside?
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16 views

floating solar battery charger

Hello!. I am mounting a solar charge controller. with floating voltage !. the schematic illustrated is as follows. A voltage of 27.6V is introduced, which passes through 3 diodes of 10 Amperes. along ...
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72 views

Replacing 18650 Cells in a laptop Battery

Is it possible to reconstruct a battery of a laptop with better quality 18650 Cells than that are used by the OEM Manufacturers. eg i have a MSI ge62 6qf with rubbed off LG cells so i cant tell what ...
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35 views

How to consider lifecycle in PV power smoothing?

I am planning to size Battery for Solar PV system by smoothing the PV output. Capacity size can be obtained by looking at Max charge/discharge needed to smooth the fluctuation. This should make able ...
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44 views

Is current draw the same when powering a device directly from batteries or from a dc-buck converter?

I’m having a strange problem here: When I use two AAA batteries to supply a small slave flash, it charges in 10 seconds, with 1.4A instant draw for the first second and smoothly reducing current draw ...
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34 views

battery life of rechargeable lithium battery

I am trying to determine the life of a lithium rechargeable battery (approximation) before a complete replacement is required. From Panasonic's datasheet, I see that at avg. 10% discharge, it is rated ...
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90 views

Is there a theoretical performance limit for Lithium Ion batteries?

Is there a theoretical performance limit for Lithium Ion batteries? I'd like to compare energy density of Petroleum Products based upon what limits can be obtained from stored energy in Lithium Ion. I'...
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62 views

Voltage drops after connecting two batteries in parallel

I have two batteries 12V GEL 130Ah, each charged to 14.4V. After connecting them together in parallel, the voltage drops gradually and equalizes at 12.99V. (I use 10mm^2 short cables to connect them ...
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150 views

Tp4056 overcharging

I have combined five 18650 cells in parallel and i am charging them using a single tp4056 circuit . The problem i am facing is that the module keeps on charging. I had to stop the charging manually at ...
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186 views

Battery Backup with Monitoring, Low Voltage Cut Off with Hysteresis and Auto Power Recovery

As an overview of what I am trying to achieve. I want to create a circuit that will trickle charge 8 x NiCd batteries (2200mAH) so that in the event of an “occasional” power loss my 5v circuit is ...
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226 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
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23 views

Buying used Lithium Ion Battery

I'm setting up a hybrid solar system and was looking into batteries. There is a local guy selling Aggison 48V Lithium Ion batteries that he claims are "slightly used". How do I check the usage on the ...
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121 views

high voltage multiplexer for battery cell monitoring

I'm working on a battery management solution with 50.4V battery (36 cells in series with 1.4V a single cell voltage) for automotive application. i'm planning on using multiplexer and differential ...
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55 views

Can changes be performed to IEC 62133 certified batteries?

The vendor I contacted asked me about changing the length of the leads, removing the connector and adding a NTC thermistor to the protection circuitry of the battery pack (IE-C62133 certified). ...
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59 views

Acceptable voltage difference between two batteries connecting them in parallel

Although the answer might be easy, I am a newbie and want to ask before burning my house down. I've seen a lot of battery packs tutorials. Now I have to use my knowledge to connect two 7S packs in ...
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91 views

My BLDC motor is stuttering and I have no idea why

I'm driving 2 BLDC motors with two ESCs, the motors and the ESCs are powered by an external LiPo battery and the Arduino is powered via usb. The motors work with pulses between 1000 and 2000 ...
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51 views

Precision battery voltage meter, Auto adjustment by R-2R

For a more precise measurement of a battery voltage I'd like to apply auto adjustment. The input voltage ranges from 2.5V-4.2V (single cell) to 20V-72V (module). At the moment the input voltage is ...
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32 views

Can lipo and Lithium-ion batteries be used together?

Lithium ion batteries have high specific energy and lipo have high c rating (high power). Is it possible to put lipo and lithium-ion batteries in parallel if they are at the same voltage and ...
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248 views

LM3914 schematic values

I'm trying to study an electronic schema based on a LM3914 but I can not find the same threshold voltage, can you help me? Source of the schematic ...
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329 views

Li-Ion battery modification to charge with Ni-MH charger

First of all, I have to say I know "Li-Ion batteries can not charge with NiMH charging". So this question about li-Ion battery modification. 1. I found a battery from China that consists of 2 serial ...
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130 views

LTC4417 Power path converter not working

I am fairly new to pcb design and I am having trouble understanding why my PCB is not working. I am using a LTC4417 power path converter and a IRF7324 power mosfet to turn on an embedded system with a ...
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53 views

Designing Battery Power System For Robotics

I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
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91 views

Battery life and negative current

I am working on a battery powered project. With a multimeter I've been measuring current on the "positive" side of a module and observe 5μA. However I thought to measure the "negative" side and was ...
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373 views

Ultra low power arduino wireless sensor : care of battery discharge

I'm prototyping a ultra low power wireless sensor. To consume less I run a arduino mini pro at 1.8V at 8MHz with sleep 99% of time. The power comes from a LIR2032 coin and the 1.8V is generated from a ...
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108 views

Self-charging robot safety considerations

I have made a 3S5P (18650 Sanyo NCR18650GA 3500mAh with 10A discharge rate) battery pack (about 220 watt hours when fully charged) for a robot. I'm using a BMS with balance (supports up to 60A ...
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362 views

Output voltage of powerbank circuit is the same as the battery voltage

I'm trying to use this small (and awesome?) unit as a boost/step-up converter for my project. I need to give my ESP8266 12-E NodeMCU a 5v input from a 18650 battery. Since this powerbank already had ...
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99 views

Source voltage and capacitance

Does changing the source voltage (i.e. voltage of the battery) affect how long it takes for a capacitor to charge in a circuit? Am I right in saying that since the capacitor charges until it reaches ...
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38 views

High-Current Shutoff Protection on a Robot

I'm working on a robot that uses a total of four motors for its movement. Each are rated for 2A stall, and the battery has a high enough discharge capability to run all of them at full, and then some. ...
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64 views

How much silver is needed in a silver-zinc battery, per kWh?

I'm trying to figure out how much silver is theoretically needed per kWh for a silver-zinc battery. From this data page, I gathered the following: \$Ag^+ + e^- ⇌ Ag (s) \hspace{6 cm} +0.7996\$ \$...
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122 views

Can I control the charge of a Cell-Phone with a 555 Timer and a Transistor?

I want to charge my phone in a controllable manner, using a 555 and a Mosfet transistor. The 555 is a countdown timer that gives an output (pin 3) of 5V for 1 minute, and then remains at 0V until an ...
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158 views

Any specific precautions should be taken when using 2x AA LiSOCL2 batteries in parallel?

I am working on the wireless sensor design and one of the sensor is such that it needs to be kept ON through out the operation and it takes supply of 3V and current of about 100uA, which I think is ok ...
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32 views

Alternating between charging two solar cells

I am designing a boat that is operated by two solar cell banks which in turn charge two separate batteries. I would like to run the boat with one bank while the other is charging, and once the one ...
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524 views

How to calculate total current drawn by a circuit

I have been trying a make simple alarm using LM324 and a buzzer. The circuit is pretty simple. I need to power it from my 9V/1000mAH battery. But here is the part am stuck. I don't know how to ...
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58 views

Changing AA batteries for rechargeable Li batteries

I want to change 2 AA batteries in series for rechargeable batteries. The specs of the device are the following: -Input Vcc: 1.8-3.3V (It seems to support 3.5, not sure if it can be an issue) -...
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3k views

Li-Po Battery Balance Charging Circuit

I work on a solar tracking project and in this project I have to charge my Li-Po battery to store power and use this power for supplying the system. For this problem, I searched for the li-po battery ...
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298 views

Servo Regenerative Braking and Li-Ion Battery

I would like to power two of HSB-9370TH with one or two of these 7.4V Li-Ion Battery in parallel. I notice that the HSB-9370TH has regenerative braking, and my current application will have constant ...
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99 views

How to diagnose fast battery discharge

How do you predict how long it will take a battery to discharge? I thought it was simply t = C/I, but I'm experiencing a very fast discharge rate. I bought this ...
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0answers
778 views

Using a Ryobi 36v battery to power an electric kart

I'm attempting to use a [BPL3650][1] 36v Ryobi battery as the power source for replica electric willy's jeeps I've constructed for my kids. The batteries charge fine in the standard chargers ...
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107 views

polarity of unmarked battery with zero charge

This battery has the following equivalent part numbers HMA2104, HTPA7W, BKB191210/4, but I cannot find any information on the polarity/pinout of the 3 pins. Is there some safe way to figure out the ...
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822 views

Powering a Raspberry Pi Rover with Lithium Ion Batteries and Charging Them

I am working on a 4 wheeled rover project. As the rover needs to be operated remotely, I will need some sort of batteries onboard. The major parts that need to be powered by the batteries are: ...
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140 views

Arduino yielding different results when plugged to USB and not

I'm programming a control system for a motorbike powered by a 68V battery. From this battery I have a shunt resistor whose voltage is amplified by an op amp and fed into an analog pin of the MEGA2560, ...
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35 views

Powering 5" display with LiPo batteries

I'm using a 4DSystem 5" display with Arduino MEGA 2560. Normally Arduino is powered through a wall power supply but, in some conditions, I need to power the Arduino + LCD with batteries (for not more ...