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    Be Safe - Never Assume

    OK, so I know not everyone here grew up with Sesame Street, but they had a song which is perfect for this post (little video is only 30 seconds) So, having seen that, take a look at the picture below and decide which one doesn't belong. If you are inclined to say "ITS THE YELLOW ONE...
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    Is Printing on Shrink Wrap Possible?

    Hi all, I have roughly 500 cells that I need to rewrap. The adhesive used in the packs I ripped apart was insane, and easily 99% of the cells pulled ended up with shredded wrapping. Luckily, all of the cells tested in the 2100+ range and are essentially new (the packs were from aBMS recall)...
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    Large Capacity Testing - advice

    Hello all, I recently acquired two 100AH lithium-ion (LiFePO4 based) 12 v drop-in replacement 12v batteries. All of my testing gear is designed for single cells, so I'm at a bit of a loss as to how to test these for capacity. Even if they have fairly reduced capacity, I would prefer to keep...
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    How do you chose cell fuse value?

    Hi folks, I've looked through the faq, and posts, and can't seem to find info on the factors that go into choosing a fuse rating for cell-level fusing. What needs to be considered when decidingtheamperage to protect the cells from. Cell C-rating or other related specs? Expected draw/cell...
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    High voltage cells - Questions

    Hi everyone, I just got a few laptop packs with high voltage cells (LGABD11865) They have a4.35 v max charge and a 3.0v cutoff voltage according to the spec sheet. To my knowledge they are the first I've had, but I don't check every spec sheet like I should. I have a couple of questions about...
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    Powerwall Design - insight needed

    Hi everyone, I'm now really close to building out my first big bank at 48V (14s80? p) and would appreciate insight on design.I'm for sure doing 14s, but still haven't settled on the # of cells in parallel (at least 80, but possibly higher). Most packs I have seen are long and narrow (4x20)...
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    Soldering Iron Tip -- Need advice

    Hi all, My brand spanking new 300 watt soldering iron arrived yesterday, and man is it a beast. Probably longer than I really want. I haven't tried it yet, but I know that I need to get/make a new tip. The tip that came with the iron is too wide for 18650 cells (it is about 22mm wide)...
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    Do different voltages have 'full' charges?

    Hi all, I'm not really sure how to ask this, but here goes. To fully charge a Li Ion cell to 4.2 it is constant current to 4.2 at let's say 1 amp. After 4.2, the voltage stays the same and current drops off slowly to saturate the cell till current reaches about .05c. Now the cell is fully...
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    Salvage these or not?

    Would you go to the bother of salvaging these cells? They are power cells from a 3Ah powertool battery. I don't get many of these, and they are often in rough shape. They clearly get more abuse than your average laptop battery. On one side there is rust and bad corrosion (although lots of it is...
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    Two TP4056 Questions

    Hey everyone, Been a while since I've posted anything, but now I'm back with another couple of quetsions re: tp4056 chip chargers. Question 1: Is there any way to easilyuse these to charge up to storage state (3.7v) and stop? I don't really want to add an arduino or anything...just a simple...
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    Trolling Motor Battery

    Hi all, As part of this lithium journey, I want to somehow replace my super heavy lead-acid battery that I use with my trolling motor on my portable fly fishing pontoon. The motor is a 30 pound thrust Minn Kota that runs a 12v motor andhas a maximum draw of 30 amps continuous. The Minn Kota...
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    Hiya from Saskatoon, Canada

    Hi all, Since I've already asked a bunch of questions on the forum, I may as well properly introduce myself. I've been an English as a second language teacher for 23 years, the last 11 here at our local university. I lived in Japan for 3 years, El Salvador for 2, and have travelled around the...
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    Soldering Iron Question

    Hi everyone, I have a question about soldering irons for soldering cells. I have read and heard many times that higher Watts is better (80 - 100+ Watts). The idea here is that they can transfer the heat needed for soldering to the cell more quickly than a lower wattage iron. I can understand...
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    good vs. avoid

    Hi, As someone who is still going through a very steep learning phase regarding all things solar/power wall, there have been many time I have been looking at cells/battery packs, and other products and asking myself is this product good or crap? I was wondering if there could be a...
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    cell safety question

    Hi all, I'm hoping that someone can help me with aquestion I have regarding safe cell use. The questionrelates to twoissues that occasionally happen when tearing apart packs. 1) Very occasionally, I manage to get a short across a single (maybe two) cells when the nickel strip cuts the plastic...
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    cell capacity - how precise is precise enough?

    Hi everyone, This is my first post after lurking for quite some time. I have learned so much from so many of you, and gotten really interested in batteries and solar. Its not much, but my first 18650 battery pack replaced an 8 Ah SLA that powered the fish-finder on my fly-fishing pontoon...
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