Got 200 of these UB 18650 cells rated 2400 mAh. Here is the capacity test result.5d ⋅ Fit-Reception-4116 ⋅ r/18650masterrace
Saving a dead Powerpack 400. Pack voltage was 1.5V as the water damaged BMS over discharged it. Now resurrecting it one cell at a time 😃2yr ⋅ dj_ordje ⋅ r/18650masterrace
Built my very first battery today. 3s2p in a 3D-printed case in the shape of 8x D-cell batteries to power an old school boombox.3yr ⋅ njhnjh666 ⋅ r/18650masterrace
Anyone know what would be a good replacement for these batteries ? need them to be under 32mm in order to fit1yr ⋅ Fickle-Cauliflower68 ⋅ r/18650masterrace
I bought this Samsung in person, now uncertain why it has a metal strip on the side?1yr ⋅ leira27 ⋅ r/18650masterrace
This 18650 battery pack for xbox one controllers belongs here I think :)3yr ⋅ TheSolderking ⋅ r/18650masterrace
Scooter: Amphibious vehicle? [❎️] Yes [✅️] No. Yes, that is -0.31v. Four (4) cells seem to have reversed their polarity. This battery was submerged and put away wet. The highest voltage is only 0.47v.2yr ⋅ PeterPickingPeanuts ⋅ r/18650masterrace
40ah 4s22p with 400w inverter I'm working on. Testing now, gotta add a panel with plugs, switches etc.4yr ⋅ goeielewe ⋅ r/18650masterrace
Found a 2 year old battery pack with a bad board. Managed to get 40 LGGBMH11865 batteries out of it. Had to sand off the spot-welds and re-wrap. Now I’m not sure what to do with them!4yr ⋅ adtr1213 ⋅ r/18650masterrace
20s 15p NCR18650GA 72v 52ah E-Bike battery I've been asking you all questions about4yr ⋅ MakelGreeto420 ⋅ r/18650masterrace
Here it is charging - I’ve been using it everyday burning across the lake with the trolling motor at full tilt.2yr ⋅ IVEMIND ⋅ r/18650masterrace
I might be spamming at this point. Added a carry hook, and tested V3.04yr ⋅ Demijinx1 ⋅ r/18650masterrace
I ran out of 9v batteries so I made my smoke alarm run on 2 18650s. It's been running for a month.3yr ⋅ madmadoka ⋅ r/18650masterrace
anything wrong with the configuration before I spot weld them together?1yr ⋅ neoben00 ⋅ r/18650masterrace
My brother bought a 20000mAh powerbank it couldn't fully charge his phone so my mom opened the powerbank and they found this... Only 3 batteries are connected to the powerbank and the rest are dummies.4yr ⋅ thissucksassagain ⋅ r/18650masterrace
A piece of 3/4 copper pipe from the hardware store + 3x18650 = 12V PSU w/car cigarette plug outlet; here's one I used to power a 12V monitor5yr ⋅ Triskite ⋅ r/18650masterrace
Put a brand new flashlight on charge and it started smoking after a few minutes. Brown sticky stuff on the batteries. All batteries at 4v.1yr ⋅ yrys88 ⋅ r/18650masterrace
I am looking for a calculator where I can add all capacities and get a nice layout where to place what cells, since they are not the same capacity, building 23s10p3yr ⋅ OtacMomo ⋅ r/18650masterrace
Wr1043nd router on 3s. Ran great the whole way down to 7.5v with the wireless radio getting a tad finicky towards the end. This was a test if 3s voltage could be directly used without a regulator of any sort for a potential ups design3yr ⋅ TheyCallMeMarkus ⋅ r/18650masterrace
18650's for our Electric Racing Team @ University of Michigan-Deaborn4yr ⋅ dank4tao ⋅ r/18650masterrace
Juice is worth the squeeze with these dyson packs. 5th one this year.2yr ⋅ Ecw218 ⋅ r/18650masterrace
hello all, I'm wondering if someone can help me decode the actual capacity of these batteries. I'm having a bit of an issue with the people who sold them to me. thank you. :)1yr ⋅ AmphibianMountain466 ⋅ r/18650masterrace
Solar MPPT PSU for 5-24V solar input charging 1-3 18650's (1S/1-3P) with up to 3A. Delivers 5V2A7mo ⋅ soubitos ⋅ r/18650masterrace
Self discharge data of my first batch of salvaged cells, after two weeks.2yr ⋅ Arios_CX3 ⋅ r/18650masterrace
not 18650s I know but 96x 32700s for a 24s4p ebike battery :P4yr ⋅ LOL_Meister_97 ⋅ r/18650masterrace
Laptop EV. Just a thanks to all who helped me in my last message. Here are all my cells so far.4yr ⋅ squidling_pie ⋅ r/18650masterrace
My disappointed is immeasurable and my day is ruined. 20 bucks for a 10amp 900mah cell. Gonna send Acebeam a spicy email2yr ⋅ dj_ordje ⋅ r/18650masterrace
why are these two 21700's different sizes, the original battery that came with my headlamp is 4mm longer and 2mm wider? hi sorry it's not 18650, I was planning on using a few of the purple 21700's as spares for an LED headlamp. Can I use some kind of spacer?1yr ⋅ Gruntman97 ⋅ r/18650masterrace
Tired of getting bad quality power banks? Buy a diy kit. 8 x 18650 cells. QC3 and USB-C PD compatible. All for 5$ (not counting cells, obviously)4yr ⋅ Kyonkanno ⋅ r/18650masterrace
Scored 10kw of 16s1p LG boys today. Came out of some Eaton hybrid packs that were used for testing.4yr ⋅ goeielewe ⋅ r/18650masterrace
Cybrwerks: !%@$#^ Everyone else, wait you said how many watts?!1yr ⋅ Mental-Text4159 ⋅ r/18650masterrace
My personal response to the delusional CPSC and anti-vape politicians that are not just hurting vapers, but also non-vaping people like me who use these for hobby purposes.3yr ⋅ 32bitNerd ⋅ r/18650masterrace
700 (2200mah) 18650 Batteries (Not All Are Shown. Only 400 In The Bucket) | Cost Me $500 and 2 days of shucking4yr ⋅ D3athN0te101 ⋅ r/18650masterrace
Tesla battery researcher unveils new “single crystal” NMC cathode that could last 1 million miles5yr ⋅ Triskite ⋅ r/18650masterrace
Samsung ICR18650-20 Cells from 2002 still holding 82% capacity. I heard li-ion cells become unuseable after 10 years so how did these survive for 18 years?3yr ⋅ szevlin ⋅ r/18650masterrace
My chargers are slowly coming together. Waiting for parts is the worst!4yr ⋅ goeielewe ⋅ r/18650masterrace
4 Ebike Batteries to be made using 18650 bigger brother 217004yr ⋅ PreviousCanary ⋅ r/18650masterrace
How do i disconnect a 1W solar panel when battery voltage reaches say 4.1v?2yr ⋅ gucci_millennial ⋅ r/18650masterrace
Vintage cell day! First free battery pack that I have disassembled where all the cells aren't 0v. Portable DVD player the pack still worked and even powered it on when I got it (mush have been sitting since almost 2003) and the cells seem OK.3yr ⋅ TheyCallMeMarkus ⋅ r/18650masterrace
Testing out the mpt-7210a boost converter on a 40v power tool pack4yr ⋅ jamesholden ⋅ r/18650masterrace
3D Printed 18650 battery case since I'm sick of the clear plastic cases cracking in my backpack4yr ⋅ paperwaller ⋅ r/18650masterrace
Just bought my first new batteries. Am I supposed to remove this plastic wrap, or the metal strip?3yr ⋅ Z4KJ0N3S ⋅ r/18650masterrace
Got these GZNS cells form a pack, all were discharged to ~0.5v. They've charged without heat and hold charge. I'm leaving them for some time to check if they don't drop overtime. All test consistant nominal capacity and ~25-30mohm. Is it fine to use them? I'm concidering getting more packs.2yr ⋅ Familiar-Sink6342 ⋅ r/18650masterrace
Only put one strip of 8x0.15 nickel down, can I just add another layer on top to make it 50amp rating?2yr ⋅ Detz ⋅ r/18650masterrace
[noob] So I opened my laptop battery and found these. Are these 18650 if it is. Can I replace is myself ? Any tips and help appreciated. Thanks.3yr ⋅ amoorsharma ⋅ r/18650masterrace
Ladies And Gentlemen of The Jury of the World....We Have Proof...That Liito Kala....is TRASH1yr ⋅ Embarrassed-League38 ⋅ r/18650masterrace
2nd time using this 18650 welder. Display now shows undercurrent. Might be along shot but anyone have an idea what's wrong?2yr ⋅ amadeusaleksei ⋅ r/18650masterrace
13S7P with 21700, BMS has 30Amps, do you think the 10Amps fuse wire to plus pole is enough or should I upgrade to double wire ?3yr ⋅ BreitiDE ⋅ r/18650masterrace
Bought some cheap hoverboard batteries for a project, noticed they were not to spec and only hold 4V after a full charge. I've since removed them from the BMS for disposing of but wondered if they may have a use. There are no markings to indicate who made them or the actual specs. Any suggestions?4yr ⋅ ComikzInk ⋅ r/18650masterrace
Why you should only use protected cells (and also an EXTERNAL CHARGER) in a Midland ER210 radio, whether you are charging it with the internal USB charger (please don't) or the solar panel and hand crank. This thing can overcharge unprotected cells to almost 5v!3yr ⋅ high_enthalpy_girl ⋅ r/18650masterrace
Would you like this spot welder which is about the size of an iPhone?2yr ⋅ HebeHuang ⋅ r/18650masterrace
Xtar Grading Function: VC8 showing much higher capacity than VC4S and VC4SL2yr ⋅ Embarrassed-League38 ⋅ r/18650masterrace
My 2nd hand cells test ~15% higher than the guy I got them from tested. Why?1yr ⋅ someone2xxx ⋅ r/18650masterrace
Found a sunjoe/snowjoe iBAT40 ionmax battery discarded in a snowbank when walking back from my community mailbox. 20 18650s currently being repurposed as 4 and 8 cell 2S packs for DIY 12V/5V UPS blocks.3yr ⋅ zustock ⋅ r/18650masterrace
I need to make a bus bar for these batteries. Each cell can push about 2 amps. Each group has about 40 amps. I have them in series to get 24v@ 20 amps. What’s a good material for the bus?4yr ⋅ wounded_soldierz ⋅ r/18650masterrace
Project box! Finally found a cheap box will little to no unnecessary gaps. Paid 10SKR (~9USD) for 2 boxes. You fit 9 without modifications and 10 be removing some PLASTIC. They ar asle able to stack! (W or W/O plastic mod 👍👌3yr ⋅ AlbatrozzSWE ⋅ r/18650masterrace
Advice on Ryobi pack repair. Some cells are reading a voltage of 0.1 to 0.3 millivolts, ie not 1 to 3 volts. I’m wondering if these cells are protected or locked, or just dead?2yr ⋅ mickfromperth ⋅ r/18650masterrace
What is the point of that soldered extra wire? Came from a laptop battery.3yr ⋅ TheBlacktom ⋅ r/18650masterrace
Cybrwerks: ¥£££££3¥£[273737¥]£]£]|]¥]]¥]]|8<2]£]£][£[|]|]|]|] Everyone Else: Wait, you said how many watts?!?!?!1yr ⋅ Mental-Text4159 ⋅ r/18650masterrace
Put this together today for a friend's stand up racing jetski. Much lighter and smaller than your standard jetski battery. 4s4p K2 Energy LFP18650P LiFeP04. It took a ~200a load on an auto battery tester like a champ (cells are rated for 50a).4yr ⋅ goeielewe ⋅ r/18650masterrace
So I just learned about voltage rebound. They might not even be worth saving though.1yr ⋅ Arios_CX3 ⋅ r/18650masterrace
There was a rust color mark on this bluetooth speakers case which I didn't use for a year. I thought battery failed so i broke it open. I even opened the battery cover its a JJY battery and inside is surprisingly clean. it has 2.65v. Should I try charging it?2yr ⋅ Meceka ⋅ r/18650masterrace
Wish me luck guys, had my friend in China ship me 100-21700 4’800mah cells. Just need to get to testing them all soon👍5yr ⋅ hoopaloopapoop ⋅ r/18650masterrace
Made my first battery pack. 10.5ah 36v. I’m having an issue where the bms will not completely charger the pack. Will only go to around 38v and stop.3yr ⋅ thederpthing ⋅ r/18650masterrace
Is there a definitive guide how many cells in series are needed for 12V, 24V, 36V, 48V, etc? Created a chart to see discrepancies. Jegu Garcia (link in comment) said 3S, 6S, 9S, 12S, but that doesn't seem to be right.3yr ⋅ TheBlacktom ⋅ r/18650masterrace
Ive got this BMS running a 7S 18650 Powerwall. Currently 33P but planning to dramatically expand capacity to 200P or more. Can this BMS handle that expansion or will I need to run more than one BMS in parallel? Whats the best way of keeping cells balanced across a really large pack?1yr ⋅ PilotPlangy ⋅ r/18650masterrace
Question: If I make 3 of these battery banks and connect them in Parallel do I need another larger BMS?2yr ⋅ Sailorgaucho ⋅ r/18650masterrace
More testing on the battery bank, now with some interesting numbers + some additional safety things. Also added a DC-DC converter to limit the current... but I'm having some problems :/3yr ⋅ FricPT ⋅ r/18650masterrace
How Would You Measure The Current Of A 4 Slot Charger/Tester? Bonus Points For The Person That Can Spot My 3am Mistake1yr ⋅ Embarrassed-League38 ⋅ r/18650masterrace
I'm curious; when re-using lithium cells, do you wrap the over the old wraps or remove them and add keep just the new wrap?11mo ⋅ LucyEleanor ⋅ r/18650masterrace
Just found an old laptop battery that has been sitting for probably 12+ years. Should I pull them?4yr ⋅ Avocadosandtomatoes ⋅ r/18650masterrace
Building custom 18650 battery packs with JST connectors, I have the wrap covers but.. Where do I find the cardboard tops that keep the wires from getting play?1yr ⋅ Eblanc88 ⋅ r/18650masterrace
Looks like a fire waiting to happen, but runs my diy light panel for hours. All made from recycled parts (except for the BMS).4yr ⋅ thriftstorehacker ⋅ r/18650masterrace
I proudly present to you my x3AAA headlamp converted to accept The Cell.5yr ⋅ vilius804 ⋅ r/18650masterrace
How do I get these tabs off without starting a fire? I searched but am not sure the proper term so didn't find anything.4yr ⋅ improbablydrunknlw ⋅ r/18650masterrace
Came with a high end vape, want a backup. Any idea what brand? 11.1Wh1yr ⋅ im-a-loser- ⋅ r/18650masterrace
Built some Razor batteries but kept the old warning labels. [7s4p Samsung 30Q]4yr ⋅ besevens ⋅ r/18650masterrace
