Hey guys... I have some "basic" skill in electronics, but I do like to tinker.
I have a mid-'80s TERMINATOR by Synsonics guitar. For those who never heard of it, it was a 3/4 size guitar with a built in amp and 3.5" speaker. All-in-One guitar and amp for kids to learn on. I got one that needs...
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...
Complete beginner here so please bear with me!
Trying to work out a solution for changing the main battery on my portable video switching system. The project is powered off a single 12V DC 8A V-Mount battery which powers the system perfectly. That said, I can't find a UPS with the...
I am using TPS61253 Boost IC to boost 3.8V from 375mAH Li-Ion battery to operate a load of 2A and also charge the backup Li-Ion battery of 115mAH using BQ25895 chip. Looks like battery is not able to deliver the necessary current and the load circuit does not boot up correctly. Is...
Hello! First time ever posting to a forum of any kind. I have a charger made for charging a single 3.7 volt Li-Ion battery or more than one cell could be charged but at a slower charge rate. My question is there anyway to charge the two cells ran in series as the picture I attached shows with...
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...
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...
Hi, I made a circuit that charge Li-ion battery. When I simulated it, I found something strange; the time for charging was too short. I made it with 'LTspiceXVII' and here's my circuit's diagram and the graph, also I uploaded the 'Li-ion bat file'.
So, would you like to help me if you don't...
Greetings. A vendor selling TP4056-based 5 V charging modules for Li-ion cells specified the following resistance values and resulting current for selecting the current-programming resistor:
I have a question about Li-ion rechargable batteries. I have almost no experience with it. Documentation to battery is very poor, but there is an info about charging profile: Stage 1: Constant Current 0.82 Ampere (0.2C) until Voltage reach 4.2V Stage 2: Constant Voltage (4.2V) with...
Good night. I bought this flashlight for my bike:
But the light that comes out seems very little to me. I think it has more potential. Could I modify...
Is it possible to make a a non inverting DC-DC converter that makes a fix 4V from a Li-ion battery's voltage. I need about 1,5A.
The input voltage starts from 4,2V and decreasing to 2,8V as the battery discharging.
I would appreciate if someone would be able to comment/advice on the following matter. I have been looking around for an IC that would charge and balance Li-Ion cells 2-3 of them in series. It seems that the balance feature is absent in most cases. MCP73841 appears to provide most of the...
I have a Lithium ion battery pack that uses a small protection board
that protects the battery pack from short circuits and under voltage.
I am using 2 lithium ion cells in series for a nominal 7.4 volt output.
The wierd thing is the protection board has to be first initialized