It's pretty hot at the moment and I had a cold drink on my table which I forgot about for a while and there was an 18650 near it. By the time I remembered there was a pool of condensation around the glass which spread to where my battery was. As soon as I realized I quickly moved it and dried it off. Would it still be ok to use? I only have 2 18650's at the moment so I'd rather not have to chuck it away

Is it normal for my used eve cells rated at 2550mah to test at between 2900mah and 3100mah or do I have a bad tester

Hey everyone,

I'm building a small UPS for my network equipment (router and optical terminal) and can't decide between ICR and INR batteries.

I'm planning on a 4S setup with a 15W UPS board. I might replace this board with a 24W one later on, or simply add a 10W board in addition to it, to increase charging speed. My devices combined only draw 3-5W, so the battery load will be very low during discharge. I'm uncertain about the charging aspect, especially if I use a 24W UPS board or add a 10W board to the current 15W UPS board.

I have Sanyo ICR (2400mAh, 45mΩ) and LG INR (3100mAh, 32mΩ) options. I know INR is generally considered safer and more reliable, but would that difference even be noticeable in my setup?

Should I prioritize safety and go with INR regardless, or would I be fine saving some bucks and going with the ICR option?

Any insights or experiences would be greatly appreciated!

Does anybody know of a good pack for powering a Raspberry Pi, I have sets of paired 18650 batteries that work well. I just want one that has the battery management controller included so I can both power the Pi, and charge the batteries without taking them out of the pack. I'm working on a project where being self powered would help a lot.

Hi I'm from mexico, so there are not many places to get quality 18650 batteries, at least not that i know off, my almost only go to is Amazon, mercado libre or AliExpress, but I don't really trust the claims of "quality" batteries, on amazone MX o can't find any LG, Samsung or other known battery, so I come here to ask for recommendations, I know in the us are many good suppliers, but if I buy an ship from the us to mexico the fees for shipping and customs got the price extremely high...

Can anybody point me to a magnetic charger that is similar to the Nitecore LC10? Mine died in a thunderstorm and I can't find anything similar on scamazon or fleabay.

Hi. First, sorry if my english is bad. I have bought this empty diy powerbank case

           https://shorturl.at/lpu8g 

It says its 20k mah, but i have an issue where my batteries are 3350mah each and i dont wanna get 6 and leave 3 empty slots in the powerbank. So my question is, can i put other batteries, i was thinking of putting only 5 batteries and 3 batteries of 1200mah, would this work fine? They have the same voltage but not capacity. I also have another question, can i put 8 of 3350 batteries which will be like 26k mah, would my powerbank charge them just fine? Any issue with this? Like overcharging or whatever?

I just ordered the other day a Seesii Spot Welder (Upgraded Portable Spot Welder with LCD Screen, Seesii 80 Gears Adjustable Mini DIY Battery Spot Welder for Battery Plate Welding, Built-in 7500ma-h Battery, Nickel Strip & USB Charging Cable - Amazon.com) It hasn't even delivered yet and I just saw some youtube unboxing of the Fnirsi SWM-10 . (FNIRSI SWM-10 Portable Battery Spot Welder DIY Mini Welding Machine 18650 Battery Pack Welding Tool 5000mah Weldable 0.25mm - AliExpress 1420)

Anyone on here know how they compare? Is it worth switching or am I better off with the Seesii?

Can anyone recommend a very lightweight USB-C based powerbank powered by a single 18650 or 21700 (5000mAh)?

Hey guys, I have some 18650 batteries and nothing to charge them with. I have a Nitecore i4 charger and it worked for about 3 charging sessions, and now the LED indicators on it are constantly bugging and either not turning on at all or displaying confusing readings. These are the batteries I have: https://www.18650batterystore.com/products/samsung-30q-protected-pcb

Can anyone recommend a good charger that would also fit these slightly longer than 65mm batteries?

I have an 18v solar panel connected to this board

https://www.waveshare.com/solar-power-manager.htm

and use it to charge 2 18650 batteries in parallel, is this fine and how big of an issue are different capacitys in this case?

I'm planning to run a pi zero 24/7 with this.

I have various Li-Ion packs with 2S-5S that don't have balancing built-in, I've recently taken a few apart and individually charged each cell with my bench power supply which granted a new lease on life for some of these.

Is there an easier way to charge/balance them at the same time? Obviously I'll already have the case opened up and the batteries exposed. Can TP4056 be used in series if I use diodes to isolate them from each other perhaps? Or is there some sort of balancer in the Radio Controlled hobby that I could adapt somehow?

These battery packs are used for land survey gear, and they get abused and damp all the time. It's basically just a few 18650s in a plastic housing with the pack positive and negative brought out to some terminals. Cleaning them up with some alcohol and re-balancing them makes them useful for a long time and they cost hundreds each to replace.

https://imgur.com/a/unknown-18650-battery-pack-from-dead-solar-generator-Q0UYhiJ

Trying to determine if it has a BMS in there somewhere, and if so which wire does what.
In the wiring harness, the two red wires read 12v, the blue one reads 8v and the white one reads 4.5

Wanting to re-use this for a solar project, but not sure how/where I can feed input charge voltage into it

Thanks!

I have tried many Amazon and different websites and I haven't found a strip that isn't nickel plated steel. The worst is all of these claimed to be pure/99.7% nickel.... All lies.

Also this should be a separate post but how much can pure nickel strip 8mm by .1,.15,.2, &.3 actually carry. I have a 20S5P battery running to an electric motor rated for 60A current

#EN

Hello everyone,

I've recently dismantled the battery of my electric scooter (EROZ PUSAR) to test the capacities of the cells. However, I've noticed something strange.

As you can see in the photo, the blue cell is supposed to be 2500 mAh. Yet, when I perform a capacity test, I get results that exceed this stated capacity. To verify, I used two different chargers (OPUS BT-C3100) and tested four other cells from a different manufacturer (the green cell visible in the photo), and I obtained consistent values for these.

I've tried to find the datasheet for this blue cell, but I haven't been successful.

Does anyone here have knowledge about this cell or can help me understand these unusual results? Thank you in advance for your help!

#FR

Bonjour à tous,

J'ai récemment démonté la batterie de ma trottinette électrique (EROZ PUSAR) pour tester les capacités des cellules. Cependant, j'ai remarqué quelque chose de bizarre.

Comme vous pouvez le voir sur la photo, la cellule bleue est censée être une 2500 mAh. Pourtant, lorsque je fais un test de capacité, j'obtiens des résultats qui dépassent cette capacité annoncée. Pour vérifier, j'ai utilisé deux chargeurs différents (OPUS BT-C3100) et j'ai testé quatre autres cellules d'un autre fabricant (la cellule verte visible sur la photo), et j'ai obtenu des valeurs cohérentes pour ces dernières.

J'ai tenté de trouver la fiche technique (datasheet) de cette cellule bleue, mais sans succès.

Est-ce que quelqu'un parmi vous a des connaissances sur cette cellule ou pourrait m'aider à comprendre ces résultats inhabituels ? Merci d'avance pour votre aide !

https://preview.redd.it/7izd3fane62d1.jpg?width=1500&format=pjpg&auto=webp&s=64b5f9da59982f7366b5c71161c36a4d08d6cd66

https://preview.redd.it/2qr4c0o1f62d1.jpg?width=3000&format=pjpg&auto=webp&s=cb1b95564c5c9c602b7277e11443b3b3e8a06b1f

https://preview.redd.it/5bye5222f62d1.jpg?width=3072&format=pjpg&auto=webp&s=7ca444dd3f9d9ef25a37a47e8e5ea31deb7fafdb

I am looking for charging board 3S 11,1V with separate outputs for switch. This should be part of my DIY wooden Bluetooth speaker and I want to decide, when I turn it on and off. All boards have only + and -
Same way like TP4056 board has it

For reference of oem i use molicel batteries, other wraps i have tried feel worse

I was looking at a lime pack and saw that it has 6 cells in the first 6 cells in the last but 12 cells in the middle cell packs.

Why is this,and would this not cause the voltage in the first and last groups fall off quicker at the same load.

Also would this not limit the power output of the pack?

This is in regard to a 14s pack.But would a 13s pack with a equal number of cells have better balance under load and better power output?Or am i not understanding something?