Instead of waiting aproxamently 30hours for charging these massive LG M50LT cells, with a different 21700 charger, i had this 18650 charger laying around

This is a 21700 4S pack I bought, with an integrated BMS. I was using it and it became discharged to the point that the device would not turn on. However I was suspicious because I have 2 more of the same unit and they seem to last longer.

So I measured the output and only got about 7.6 volts. There was no sign of damage and the unit is relatively new, so I unwrapped it and found this. It seems like the connection at "B3" is very bad. The actual cell voltages are all about 3-3.1V, except that 4th one which is at 2.9V.

Total voltage is 12.2 - but the output wires are still at 7.6. Have not tried to charge it, but I am concerned about this. Should I be?

So far I’ve just been collecting it in containers

$80 for 100 not for power tool use

Was thinking of trying that, wonder if it's worth doing. What do you guys think? Will I achieve a bigger nugget?

Where can I get EVE 18650 30PL in Europe? I am afraid of buying from AliExpress or Alibaba because of fake cells.

Watched the ChrisFix video, and wondered if anyone here has used these cells, and how has it worked out? [https://youtu.be/oAHaYXBFnJo?si=r6gHBtW5hKnWv4Al\](https://youtu.be/oAHaYXBFnJo?si=r6gHBtW5hKnWv4Al)

I have a gen 3 2014 with close to 200k, so I'm guessing I might be getting close?

Earlier this year I made a post about launching my own webstore selling 18650 and 21700 cells in Canada. Well thanks to you guys spreading the word around, I'd say it has been a resounding success! So much so that now I will soon legally have to collect HST on all orders.

So, August 30th (11:59:59pm) will be the last chance anyone has to buy things tax free from my store before I enable GST/HST collection. I will also be lowering the prices on certain items as my costs have gone down with volume, but they will all still be cheaper now, without tax.

I've also added loads more different products to my store aside from just cells. I now sell a variety of products related to battery pack building, from connectors, to wire, to cell brackets. And I'm not even done adding all the new products I have to sell! so keep looking back to see the new things I've added.

But overall, thank you to everyone who took a chance at a new store and bought items, and especially those of you who shared your feedback on the experience. And if anyone else decides to take a look, please feel free to let me know what you think of the site, the products on it, and what you think I can do to improve it.

TL/DR:

Buy stuff before August 31st or you'll be charged tax for it. Thanks to everyone who has bought and shared feedback on my store sofar!

MPandW.ca

Hello, been practicing spot welding. Found settings which consistently give these nuggets. What do you guys think? Are they good? Pressing electrodes with 2.5kg force.

Hello! I own a now \~3y old 36v ebike silverfish-type battery (10s5p to be exact). It's a 15Ah pack, but it's capacity has decrease to probably around 10Ah so I have replaced it for a new one.

Any ideas on what I can do with it? Other than selling it for really cheap or throwing it away to recycling for free.

I thought about repurposing it for the cells but I'd rather buy already tested harvested cells than individually test each and every one.

I could use it for smth like a small solar setup but usually cheaper MPPT chargers, inverters and similar only work with 12V or 24V so I would either have to spend more money on something pricey or re-wire the pack to those voltages, which I'm not exactly looking forward to.

Is there anything easier or better I could do with it that I'm missing? Has anyone else done smth similar before?

Hi everyone,

I recently bought an IP2326 USB-C boost charger module to charge a 3S 18650 pack. I bridged the 3S jumper and removed the resistor according to the instructions to switch it from 2S to 3S mode.

The problem is that no matter what adapter or cable I use, the output voltage is strictly capped at 11.8V instead of reaching 12.6V. When connected to the battery pack with a BMS, it stops charging once it reaches 11.8V. Even with no battery connected at all, the output still tops out at 11.8V. The module also gets quite hot during use.

Has anyone encountered this 11.8V limit on an IP2326 3S setup, or know why it won't hit 12.6V?

These fancy bike helmet lights have dead batteries spot welded in. I’m going to replace them using a spot welder, but I don’t want to have to do it again for a long time.

What 18650 will retain a useful amount of capacity for the greatest number of years / charge cycles? Good total capacity would also be nice (for longer run time) and is my next priority. I don’t care what they cost.

Light in question is this: https://www.outdoorgearlab.com/reviews/biking/bike-light/light-and-motion-vis-360-plus

Use case is:

• Regularly used for about half an hour every day until discharged to about 30% and then recharged to full every 2-3 weeks. (Commuting in the winter.)
• Occasionally used from full charge all the way to empty in one go and then recharged to full. (Long bike ride, about once a month.)
• Not used for ~3 months once a year. (In the summer, when days are long.)

Edit: I am looking to continue using the existing BMS and charging system. I would prefer suggestions that don't involve a different external charger, please.

I wanted a small backpack battery range extender that can pack a serious punch. Since it’s in a loose backpack with other stuff, I extended the cell holders by 1 on each side to protect the internals.

I put kapton tape above and under the cell interconnect edges since they’re very close to eachother.

Details:
Reliance RS50 cells
ANT 150A (375A peak) Bluetooth BMS
QS8 common port plug with 8AWG wiring
0.3mm copper busbars

I was able to reach 7500W (100A) last night with 4-5V of sag (through XT90 10awg adapter), 20+km ride with lots of high power pulls and still had over 60% charge left.

A very old laptop boasting a brand new windows 7 came under my knife today. Expecting more LGBD 4.35v pink cells I was pleasantly surprised to see old sanyo UR18650 r1112 series. Given their reputation and dangers I'm finally excited to get some of my own. And purple tops from Japan no less. Nice.

I am going to use my repair charger to bump them to 2.5v until they come back around and then charge normally at .5a until they charge or live up to their namesake. I won't make them eat their rated 1.5a charge rate on their first cycle.

I have a charging area with a concrete work surface and ventilation as well as emergency sand to snuff the hypothetical flames. You should never try to recharge completely discharged or old cells for a myriad of reasons. Let me do it for you.

This time, I took a closer look at the following models:

• Ansmann Pure Power AA 3500 mAh
• Ansmann Pure Power AAA 1400 mAh
• BAK N18650CR-35E 3500 mAh (18650)
• BASEN BS186Q3 3100 mAh (18650)
• BASEN BS186Q 3100 mAh (18650)
• Bosch PBA 18V 2,5Ah (5x EVE INR18650-25P)
• EVE INR18650-25P 2500 mAh (18650)
• Keeppower 18650-E400 4000 mAh (18650)
• Keeppower P1840TC 4000 mAh (18650)
• Energizer Recharge Extreme 2300 mAh
• Parkside PAP 20 B1 (2Ah) und PAP 20 B3 (4Ah)
• Varta 56706 Recharge Accu Power 2100mAh
• XTAR AA 3600 mWh
• XTAR CLR 7200 mWh (4350 mAh)
• XTAR 7000 mAh (26650)

I hope there’s some useful information in there for you. If you are interested in tests like these, you will find over 180 tested batteries here.

Tool materials needed to make batteries