Search found 754 matches

by Matador
Jan 16 2019 6:43pm
Forum: E-Bike General Discussion
Topic: I bought an E Bike for my wife but she says its to slow
Replies: 15
Views: 527

Re: I bought an E Bike for my wife but she says its to slow

You can also just run higher voltage on the same setup (same controller and same motor). Acceleration will remain the same, but top speed would increase. For ballpark estimate, go from 36V to 48V and you speed increases to 133% of the original top speed (around 32 km/h). I have a small folding 36V e...
by Matador
Jan 06 2019 7:28pm
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 212
Views: 24342

Re: How To, 50A BBSHD Controller Mod

Saw this on youtube !! Nice!



Shunt mod at 30:00.

Matador
by Matador
Jan 04 2019 9:11pm
Forum: Battery Technology
Topic: Did the bms drain the cell group?
Replies: 8
Views: 381

Re: Did the bms drain the cell group?

Thanks for the advice Fechter ! Will do. I did balance charge it for 12 hours the last time I fully charged it and then discharged it to 51.6V. Will rebalance everything when summer comes. I check bulk voltage every month too.

Matador
by Matador
Jan 03 2019 7:19pm
Forum: Battery Technology
Topic: Did the bms drain the cell group?
Replies: 8
Views: 381

Re: Did the bms drain the cell group?

Since we're in the subject and I hear you guys have a lot of experience with BMS. Do you think this BMS is likely to be on that drains cells unequally (example the last 3 cells groups closer to the negative ) ? or should it be alright. I'm currently storing it at 51.6 (avraging 3.68V per cell) Here'...
by Matador
Dec 30 2018 11:39pm
Forum: Battery Technology
Topic: Cap cooling of 18650, thermal output graphs?
Replies: 8
Views: 350

Re: Cap cooling of 18650, thermal output graphs?

How many watts of thermal energy does a 3000mah 18650 generate at 1,2,5 and 10C? We need to know the DC internal resistance of the cell you are using to answer this question. To make things even more complicated, DCIR can vary with state of charge... such as in this example for a good old Sony VTC4...
by Matador
Dec 30 2018 11:37pm
Forum: Battery Technology
Topic: Cap cooling of 18650, thermal output graphs?
Replies: 8
Views: 350

Re: Cap cooling of 18650, thermal output graphs?

I am researching 18650 cell cooling, one source said that tab cooling prolongs cell life by reaching into all the layers of the battery, is it the same for cylindrical batteries? How many watts of thermal energy does a 3000mah 18650 generate at 1,2,5 and 10C? I found a couple of fun videos of X-ray...
by Matador
Dec 30 2018 9:24pm
Forum: Battery Technology
Topic: Samsung 40T - 35A 21700 Li-ion battery's capacity test
Replies: 13
Views: 740

Re: Samsung 40T - 35A 21700 Li-ion battery's capacity test

If someone could make this exact 4 wire leads tester with silver plated solid copper terminal and no solder joints, that would be awesome !
by Matador
Dec 26 2018 8:25pm
Forum: E-Bike General Discussion
Topic: Hailong Case... TIGHT!! Aaagh!
Replies: 9
Views: 585

Re: Hailong Case... TIGHT!! Aaagh!

I have plans to try and fit as much as possible into one of these. Any one reckon it would be possible to do 14s6p? Failing that maybe 15s5p? I don't need any BMS, or switch or USB, etc. and I'm not afraid to cut away some of the inside of the case if necessary. Cheers Hailong might be too small th...
by Matador
Dec 21 2018 6:15pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 208
Views: 41317

Re: Building battery from MAKITA Konion PACK

2.8V is not dramatic, so as long as they do not ever reach below 2.5V, you're good. Learn about your VTC4 cells. CHECK THE DATASHEET which has all the specifications: Specification_US18650VTC4.pdf On that datasheet, you will see that the manufacturer (Sony), specify it's okay to discharge as low as ...
by Matador
Dec 21 2018 6:09pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 208
Views: 41317

Re: Building battery from MAKITA Konion PACK

Both. Charge, then discharge. What you want is discharge capacity. Charge capacity is not reliable because all the cells from different packs are not necessarly in the same state of charge (some cells may be 52% charges, some 23%, some 97%). So some will need less charge time to become full. But onc...
by Matador
Dec 20 2018 10:47pm
Forum: Battery Technology
Topic: Building battery from MAKITA Konion PACK
Replies: 208
Views: 41317

Re: Building battery from MAKITA Konion PACK

Dude, just use 1000 mA (C/2)... It's much faster to test each cells. 500 mA (C/4) will take twice as long and 200 mA (C/10) will take 5 times as long. In any case, the capacity you'll get on your eBike will be slightly different from that you test, whatever the setting, because you'll very likely dr...
by Matador
Dec 16 2018 12:24pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:21pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:20pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:18pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:17pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:14pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:07pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:04pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 12:01pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 16 2018 11:59am
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

by Matador
Dec 15 2018 7:30pm
Forum: Battery Technology
Topic: DIY battery enclosures
Replies: 17
Views: 515

Re: DIY battery enclosures

I also love these homemade aluminium box...
14S10P, so you'll never have any sort of range anxiety before you butt can't take it anymore:



Matador

I need a TIG welder... that is the solution to all my problems...