batteries

May I know whether I am properly converting from mAs to mAh.If wrong please guide for the proper method.I am taking standby current to show my calculation. The chip is working on a 3.3V supply and its standby current is 0.00085 mA. For one day the chip will be active only for 4.24 seconds. Rest...

Hi I build a backup battery to use on my FTTH modem when power loses. I used 3 batteries of following image in serial. I using a 3cell 10A BMS and charge them by 12.6V. For first 1 Hour modem works correctly but after it modem just run into restart loop. but in this state when i measuring...

I placed a lithium ion battery in a battery recharger. I let it recharge for a little bit. Then the light turned from red to green. I measured the battery voltage, it was 3.98 volts. That means it's fully charged?

I need help from professionals with my Active Cell Balancer Circuit. Basically, I am trying to make an active cell balancer using the STM32 microcontroller. The MOSFET I plan to use is the IRFZ44N, along with the TC4422 IC driver. I will measure the battery cell voltages via the ADC of the...

Greetings, I am facing issue with TPS61240 as a buck-boost converter. I am using TP4056 to charge the battery and DW01 (and FS8205) to protect the battery by referring this blog. Also, note that I want to operate the other module; due to this I am using this below shown circuit to high/low...

I got an 8S 8P battery back and a BMS connected to it. The BMS is supposed to be compatible with 6S, 7S, 8S, 9S, 10S batteries and I was told by the manufacturer to short 2 pins together to get it to work with 8S batteries as shown in the following pictures. I checked all the connections...

I am trying to build a circuit to emulate a lipo battery. Basically the circuit consists in a power supply to emulate the discharge behaviour and a variable load to eulate the charge behaviour. This is the circuit in a simplified way This basically generates 2 circuits...

Hi all. I have designed a PCB using the OPA4990IDR op amp in a comparator configuration. I have use the OPA as a unity gain buffer also before the comparators. The purpose of this PCB is to measure battery voltages of up to 10 Li-Ion cells (3.3V each , 38V MAX). I am having a problem tho...

Greetings fellow electro-heads! First-time member/poster here, so I'm hopeful for a warm welcome! =) I am currently designing a fun personal-vehicle project involving an electric catamaran/quad amphibious vehicle, and I am reaching out for some advice about the powertrain possibilities for a...

Hello to all I am a beginner in electronics I had a question, is it important to charge the battery for the first time to continue charging the battery for several hours after it is fully charged? Because some sellers say this, but I don't know if this is scientifically correct or not tnx for...

Hi All, This is my first post at AAC; it looks like a great place to come for advice about battery selection for my project. I'm trying to refurbish some wildlife radio transmitters. The manufacturer wants $165 to refurbish each one, when all they need is a new battery. I've not been able to...

Hi, if I use a 5V 30Amps Power Supply Unit to plug into the input of this Lithium ion battery charger module, is it fine since it will draw a limited output of 1A to charge the battery which it requires right ?

Hi. above is a charging cut-off circuit. As you can see in my demo. when voltage source is 5V, the load (R9) has 5W power. When voltage drops to 4V, the load (R9) has 0 W (cut off). However, my lithium ion charging pin for my battery is 4.26V. Thus, when battery fully charged at 4.2V, the...

hello everyone , for educational goals we want to make a simple charging board which charge simple 3.7 V mobile batteries ... i have some question for example what happened if i directly connect that battery to 5V 2A ? will charge correctly ? will battery damaged ? what's the correct form to...

Hope you all are staying safe and healthy. The Pandemic lockdown has forced us to work with the only components we have at home. I am working on a battery-operated esp32 pico board having other sensors hooked up to it that need 5v of supply. So I connected two rechargeable 3.7v Li-Ion batteries...

Hi everyone! I am building a robot that carries a drill to make holes in the ground. I have not been able to find similar size/power references regarding how to power the motors. I would like to know how to protect the battery and motor drivers, my specific questions are: - Where to place...

Hi everyone, I'm trying to design a circuit whose battery can be hot swapped. I have a 3.6V battery connected to a boost converter, outputting 9V. I'm powering a small computer that requires a 9-20V input, and at idle consumes ~10W. I figured that, so that the computer stays on for 10s (with a...

Tl;dr: Are putting Li-ion batteries in a Wind-up flashlight a thing? If not, what options are there for a more reliable, renewable light source? Hello, I'm a Paramedic, husband and father of a small family of 3. We don't make much money and live in an area where we are often heavily impacted...

Hi All, I have four identical 18650 Li-ion batteries 3.7v \ 2500mAh and a BMS 2S. My goal is to get 5v (with step down) and more current capacity. so I though of connecting the batteries as 2P2S as battery university suggested. 2P because the Li-ion will balance themselves and for more...

Background I'm working on a seismic alert network and seismograph station at my school in Puerto Rico. We're building a solar system for the system to continue running during a potential seismic event. The system only consumes about 10 Watts, but with the satellite internet equipment it might go...