r/18650masterrace

My Kobalt 80v battery was draining a lot faster than it used to, which is understandable as it’s about 5 years old. So I ordered some cells to rebuild it. The charge indicator light works, and there charger accepts it apparently, but when I put it into any tool, it runs for a second before the bms shuts down.

I charged all cells before building the pack, and the voltages at all of the bms solder points look correct. I used 0.2 mm nickel strips and slotted them by hand. After the battery shuts down, I can feel one part of the bms is warmer than the others, near where one off the four sets of wires connects.

Hopefully one of the battery gurus here has an idea of what I screwed up.

Hi, I put into a boring rainbow effect led par a battery, bms, fan and an esp which lets you connect you via website to control the color, brightnes, modes etc. I am a little worried if it is a danger leaving it as it is because the LED Array gets really hot( you can still touch it without needing to pull away) but it basically sits ontop of the lions. Also below them theres the bms which gets warm aswell. The fan is controlled by the esps onboard temperature sensor.

Should I be concerned?

Because the frequent power blackouts in my country, I have at hand a desk fan with a 12V 0.5A fan, so I purchased a 3S 40A BMS and 6x 18650 batteries to be charged by the BMS. The battery wiring is exactly like the 1st picture. I also got a 12.6V Li-Ion charger (2nd picture).

I'm aware that I need to wire the DC adapter's positive lead to the BMS' positive pad and the same for the negative lead. But what about the actual fan (with its own switch)???

Do I wire it parallel to the charger and BMS???? Do I need diodes???

The freaking AI suggested 2 diodes, one from the DC jack positive terminal to the diode's anode, and the other diode from the BMS' positive terminal joined at the cathode and then that joint part goes to the switch. But I fear that with that, instead of 12.6V, the BMS will receive less voltage because of the Diodes.

Can you help me out the correct diagram to wire the BMS to a DC fan???

My goal is to keep the fan on on battery, but also on wall power. If possible, to be able to run the fan and charge the batteries at the same time.

A few days ago, my kid's toy stopped charging. I opened it up and found this battery pack inside. Is there any safe way to jumpstart it back to life, or would it be easier to just buy a new one?

Hi! I have a solar-powered garden wall lamp that uses a 18650 battery (specs in the attached photos). It stopped working properly so I suppose the battery needs to be replaced.

I have found this one https://www.nkon.nl/en/japcell-inr18650-3500mah.html but I am not sure if it will work?

Also, I'd appreciate it if someone could explain to me the meaning of having a protected/unprotected battery.

Thank you in advance for your help!

72 batteries reading 4v taken from ebike battery.

Location Islington, London. Could post but you pay.

DM me

I purchased the set of P30B on the right last week, and have just noticed that the printed text on the battery wrap is different compared to my old set (pictured on the left).

Has there been a change to recent batches? Or should I be concerned about their authenticity.

The new ones were purchased from Battery 101 in the UK.

The pouch cell in my JBL GO1 Bluetooth speaker suddenly inflated after years of complete cycling and heavy usage. So I removed it to save my speaker, and fitted an 18650 holder from AliExpress on the outside. Not even 15 minutes of tinkering, and I couldn't be happier with the outcome. Charging doesn't work any more now, because maybe there is no temp signal any more? I don't care, if it's drained, I just swap the cell and charge it externally. Works great and saved a good speaker. Would recommend this repair to anyone who doesn't want to buy a new one ✌️

Frame: https://makerworld.com/models/1279431

Filament: SirayaTech ABS-GF Fibreheart/Core

AIO: BetaFPV Matrix 4in1 12A

Motors: RCinpower 1202.5 GTS V3

VTX: HGLRC Zeus Nano

Cam: Caddx Baby Ratel v2

Antenna: FlyFish Osprey RHCP

Haven't flown it yet, but having trouble with no OSD in video and the sound coming from Skyzone 04Xpro headphone jack being just humming noise (even though I soldered 2 Filters into the steadyview receiver).

Also the frame isnt perfectly compatible with this cam, as i can't angle it upwards :(

EDIT: Fixed every issue except the bad audio one. Will need further investigation. Also it hardly flies. PIDs are super off and the whole thing wobbles like crazy. Can anyone help?

Are these useless, in the UK where do I dispose of them.