battery

Hi all, Not sure this is the right place but Im looking for some expertise/help in understanding design of a simple circuit. Im looking to make something that would make a noise after being triggered by either impact or a magnet. Looking for this to be very very small also. Smaller than a...

Hello I an battery discharger, I found the following contactors used. It can handle up to 100A current. But not sure what these DC contactors are. Can someone identify this?

Hi All, I'm hoping some of you help me out. I want to make a power box for my trolling motor. Using a weatherproof case, I want to put a battery, charger and a combo voltmeter/USB charger inside. On the outside would be power connections, the voltmeter display and an on-off-on switch. I want...

In my app i can see thst my button is toggling when im pressing that should stop the water pump but its not stopping it (I am using arduino uno just for the 5v to power the railway that is connected the vin pin and the vcc for relay)

Hello, I'd been trying to balance a couple of 12V 100Ah LifePO4 lithium batteries in order to put them in series to power a 24V inverter but I it seems that one of the batteries is not OK. The batteries had been used for different things before and had different state of charge.. one had 12.9V...

I'm working on a research project at my school that includes flying a drone with an attached signal source to collect data. The signal source is powered separately from the drone and is reliant on an atomic clock that needs to be reset once it runs out of power. In order to avoid this, I am...

How would I make a device that can be connected to using bluetooth that does nothing but vibrate on and off that is powered by battery. This needs to be able to fit in a person's hand. I would like to see how small this can be using a chargeable battery and how small it can be using a coin...

Hello Everyone, I am really new to electronics and I am struggling to figure out how I would be able to use my GreenWorks 40 volt 4 amp hour battery on a 48 volt 1000 watt electric bike conversion kit. I have looked for a step up converter from 40volts to 48volts but I was only able to find one...

Hi everyone, First of all, nice to meet you all. I've always admired this field but I never thought I have the capacity to actually do anything in it. That being said I started learning stuff with the pandemic cause I had the time and yeah ... it's even more amazing now. That being said, one...

I am working on a project that involves monitoring a cars battery. I can measure the voltage of it using a voltage sensor, a display and an arduino but that doesn't tell me much about the health of the battery. After researching, what seems to be the most popular way is putting a load onto the...

Okay so, currently wanting to set up a test for some rechargeable batteries, and developing a lower power mode for a system. The goal is to connect fully charged batteries to my devices to see how much current they actually drain. I have an estimate how long they should last, but its not exact...

I have a tp4056 li battery charger and I ordered a 440 mah lipo battery. Is it OK to chare battery with this or will be the current too much for battery? Do I need to modify module?

Hey Guys & Gals, I have a couple questions about power for a device. I have a small handheld computer/Programmer and it has USB-C port and has a 3.7vdc lithium wired battery. The unit has the battery in the space where it could hold 4aaa batteries thou not wired for them & no contacts for them...

I am using one machine (which has a small motor) which has battery of 1.2v which got dead and i want to change the power source to USB. The battery is of 1.2V and 400mAh. Motor connected to works perfectly fine if provide the 1.2V from bench power supply. I want to use USB power supply instead.

Hello Folks, as the title say I want to buy Battery Charger and found this one on aliexpress - https://aliexpress.com/e/_Ddn2rtR Price seems decent but what about qulaity? Any help is wellcome, thanks!

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...

Hello friends, so now i have came up with this small battery and its small circuit. These are two identical circuits and i have numbered it 1 and 2 in the images attached. This circuits are from two identical vapes, it had this rechargeable battery and a type C input for charging the battery. i...

When I build the circuit on the circuit breadboard. the input voltage is 1.3，but output only 2.0v without load resistance. when I input 3v with two cells batteries，the ouput only 2.8v without load. If I add load for circuit, the output voltage is lowee. So why? Is that any problem with official...

I have an external switch connecting GND to RST on an 8266, it looks like this: [GND] ------ [normally open switch] -------- [8266 RST pin]. The ESP goes to sleep, and then the switch wakes it up. However while in operation I want this reset functionality disabled, but at a hardware level...

I'm an automotive mechanic that specializes in electrical/drivability diagnosis. I like helping other techs get a better grasp on this aspect of our trade. Now imagine I'm with another tech and I have a battery and a multimeter in front of me. I measure the battery's voltage and get 12V. Me...