Search found 1664 matches

by flippy
Dec 18 2019 9:54am
Forum: Battery Technology
Topic: Meanwell clone- AD488.3-400W power supply mods
Replies: 130
Views: 17946

Re: Meanwell clone- AD488.3-400W power supply mods

the NTC is to prevent massive inrush currents that destroy the contact area of whatever you are using it power it (a plug or switch) and the prevent the RCD from popping. not using them will degrade wall sockets and after repeated use it will cause wonky sockets that will burn houses down. the reaso...
by flippy
Dec 18 2019 8:49am
Forum: Battery Technology
Topic: Meanwell clone- AD488.3-400W power supply mods
Replies: 130
Views: 17946

Re: Meanwell clone- AD488.3-400W power supply mods

NTC rating is very important. wrong rating and it will either simply not work or burn up lots of power.
by flippy
Dec 18 2019 12:56am
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 186
Views: 40823

Re: Fuse-wire for individual cells, DIY Tesla style

if you have a decent bms they are EXTREMELY unlikely to fail Links to examples of models you consider that reliable would be appreciated for most people here a tiny would be sufficient: https://www.energusps.com/shop/product/tiny-bms-s516-150a-750a-36 just remember cables are sold separate wich is ...
by flippy
Dec 18 2019 12:55am
Forum: Battery Technology
Topic: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)
Replies: 37
Views: 2255

Re: Car flooded Lead acid Batteries - Question for Lead Acid expert (in search of lost wisdom)

charge it to full and keep the negative battery terminal disconnected until you want to use the car.
by flippy
Dec 18 2019 12:47am
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 186
Views: 40823

Re: Fuse-wire for individual cells, DIY Tesla style

dont follow exactly how a cell checker is some kind of magic bullet here. if you have a decent bms they are EXTREMELY unlikely to fail and if they fail they fail "safe". so if it craps out or just errors out your whole battery basically dies and you know something is wrong. depending how you program...
by flippy
Dec 11 2019 3:08am
Forum: Battery Technology
Topic: Can heating up battery give longer distance?
Replies: 24
Views: 2364

Re: Can heating up battery give longer distance?

dont use handlebar heating. use heated gloves. way more efficient and comfortable. :wink:
by flippy
Dec 09 2019 4:24am
Forum: Battery Technology
Topic: Optimal Charge Voltage - (LiCo)
Replies: 38
Views: 4503

Re: Optimal Charge Voltage - (LiCo)

yes, caring for your battery and using it within its specs extends its life.

i generally recommend cranking the voltage of the battery so you can simply cap the top speed so you dont lose speed when draining the battery or driving with partial charge often.
by flippy
Dec 06 2019 4:07am
Forum: Battery Technology
Topic: Optimal Charge Voltage - (LiCo)
Replies: 38
Views: 4503

Re: Optimal Charge Voltage - (LiCo)

I guess also the low charge and discharge rates are also important? C1 is quite mild, it's funny when we see folks post a photo of their 18650 pack complaining they are 'already' losing capacity when its clear the discharges have been so extreme that pack has blackened/barbequed spot-welded metal s...
by flippy
Dec 03 2019 5:30am
Forum: Battery Technology
Topic: Optimal Charge Voltage - (LiCo)
Replies: 38
Views: 4503

Re: Optimal Charge Voltage - (LiCo)

Flippy I told you many times that your information about Tesla batteries are not true. All Teslas from the first Model S could be charged to the cell 100% SoC which is 4.2V per cell or 403,6V per battery pack. There are available many videos showing that in range mode or 100% battery the display is...
by flippy
Nov 29 2019 4:07am
Forum: Battery Technology
Topic: Optimal Charge Voltage - (LiCo)
Replies: 38
Views: 4503

Re: Optimal Charge Voltage - (LiCo)

my personal scooter spent most of its time at 4.05V in summer and 4.1 in winter float charging. after 50k miles i lost 6% capacity. in general its best to look at peeps here that did the actual testing or companies like tesla that are dumping hundreds of millions in battery tech and their whole busi...
by flippy
Nov 28 2019 3:21pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 48699

Re: Li-ion cells cycle ageing

i am not generalizing, i hope i am putting things in context. when spending large sums of money on something you care about the specs, in a car you might find fuel economy/tank size more important then acceleration numbers, but for someone else they might only care about acceleration and not care ab...
by flippy
Nov 28 2019 12:17pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 48699

Re: Li-ion cells cycle ageing

TLDR No I do not mean NMC, nor NCM, CMN, CNM, MNC and MCN All are very similar, if not different letters for the same nickel + manganese + cobalt combinations. I mean NCO, aka LiNiCoO2, aka lithium nickel cobalt oxide that is why people should ignore the magic chemistry marketing wank and just look...
by flippy
Nov 27 2019 1:42am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 48699

Re: Li-ion cells cycle ageing

chemistry is not even relevant to the end user, only performance matters, and due to the major performance gaps in the same chemistry groups you cant draw any conclusion from it consdiering how differerent cells are. just look at the raw performance and see what cell is the right one for your applic...
by flippy
Nov 25 2019 8:05am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 48699

Re: Li-ion cells cycle ageing

takyka, those parameters are behind gentle utilization, so no such big surprise. PF is obviously not the best choice, don´t understand your nostalgia for it. You have better options like 29E or newly M29. Or M36. the PF's used to be the cheapest kid on the block. now tis overtaken by the superior 2...
by flippy
Nov 22 2019 9:56am
Forum: Battery Technology
Topic: Ultrasonic tab welding
Replies: 38
Views: 4327

Re: Ultrasonic tab welding

spotwelding is extremely reliable and effective. that is why you see it -everywere-. the only reason you see this "diy" surge of also wanting to do fuse wire is because of tesla, but the reason they do it is because they have to do 8500 cells as fast as possible and reduce weight as much a possible....
by flippy
Nov 19 2019 4:25pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 48699

Re: Li-ion cells cycle ageing

Why does LG list this cell for 500 cycles at 1.5/4A in their datasheet? datasheets are written to make the battery seem as good as they can while keeping it within the intended use case. this is why high drain cells generally have lower lifespan cycles on their datasheet as lifespan is not as impor...
by flippy
Nov 19 2019 2:14pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1167
Views: 160999

Re: kWeld - "Next level" DIY battery spot welder

ossivirt wrote:
Nov 19 2019 1:25pm
BTW: If I use lipo with kweld can I at the same time charge it through balance leads? It would keep it nicely full I think :roll:. I have used small charger with lead acid battery.
yes, you can.

just make sure your charger is isolated or not in any way connected to any part of the welder.
by flippy
Nov 17 2019 7:48am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1455
Views: 179563

Re: bluetooth BMS?

My 300A smart BMS bought from ICGOGOGO has started to fault, reason is that cell1 is seemingly dropping to nearly zero volt. It’s on and off at random. Anyone else got the same issues? I’d guess a poor connection would be less digital (and go to zero) so i suspect it is unfixable. Closing the loop ...
by flippy
Nov 15 2019 4:59am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 3353

Re: Max safe Voltage Difference when connecting two Batteries in parallel

i still have a couple brand new GA's. i will start testing in the new year, so if people what to see specific tests they can let me know. if i have space left for cells to do a request run i will do a test if it has merit. it might be something to start a new topic specifically for testing cells and...
by flippy
Nov 15 2019 12:51am
Forum: Battery Technology
Topic: What battery to choose after your last one burned your house.
Replies: 113
Views: 10290

Re: What battery to choose after your last one burned your house.

if a cell faults internally bad enough the PTC will pop, no fuse needed and i have seen quite a couple of tesla packs that have been in accidents and have never seen a blown fuse wire. cheap cells will just start leaking. i got plenty of examples of batteries i got on my bench that were just months ...
by flippy
Nov 14 2019 6:48pm
Forum: Battery Technology
Topic: What battery to choose after your last one burned your house.
Replies: 113
Views: 10290

Re: What battery to choose after your last one burned your house.

This still leaves me with the question why they don't provide a fuse on every cell? Even commercial ebike batteries don't seem to have it. I watched some youtube videos of guys creating batteries for power walls (Something like 40P or 50P) and they do provide a fuse wire on every cell. Obviously, 4...
by flippy
Nov 13 2019 5:18am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15930

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

it depends on battery size, but 50 bucks on a 100 cell pack is a lot for most people considering the target audience here, especially if you take the E6 version, those are even cheaper and preform basically indentically. its nice to see pricing to have changed, but the main advantage of using more b...
by flippy
Nov 13 2019 1:33am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 3353

Re: Max safe Voltage Difference when connecting two Batteries in parallel

if you are a enginerd you will know I just love that new word so much, hope you don't mind of I borrow it. > people need to mark posts that "recommend" dangerous stuff with massive disclaimers on public forums, there are way too many dumb people on this planet I completely disagree, humanity needs ...
by flippy
Nov 12 2019 3:19pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 15930

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Honk wrote:
Nov 12 2019 1:01pm
999zip999 wrote:
Nov 11 2019 5:15pm
I'm 61 and my street bike goes 47mph on flats and 36mph on most hills. 7,000 watts. Funny I don't feel old yet.
Wait until you fall, then you'll feel old !!!!
if you fall at 47mph you will feel a lot of things, just not your skin.
by flippy
Nov 12 2019 3:04pm
Forum: Battery Technology
Topic: Which cells for battery and my project.
Replies: 8
Views: 707

Re: Which cells for battery and my project.

Torti wrote:
Nov 12 2019 2:11pm
he size is approx.

L300 x H300 x B220



I think so, 18650, but which cells? should the size be around 60AH,
check ali for honeycomb 18650 holder and make a template and start making a grid you can fit into the box.