Search found 263 matches

by randyc1
Jul 27, 2017 3:12 pm
Forum: Battery Technology
Topic: How to Re-balance cells in a 10S4P pack ??
Replies: 3
Views: 221

Re: How to Re-balance cells in a 10S4P pack ??

Ok thank you guys for the reaponces!
by randyc1
Jul 27, 2017 12:33 am
Forum: Battery Technology
Topic: How to Re-balance cells in a 10S4P pack ??
Replies: 3
Views: 221

How to Re-balance cells in a 10S4P pack ??

In my E-skate 10S4P pack some welds were damaged by extreme bending ( Car incident), at the time only enclosure was damaged , but after a few rides a Power problem occured. I took battery out and discovered the damaged Welds on 2 of the 4P Packs out of the 10. I disconected those 2 pack from the 10 ...
by randyc1
Apr 20, 2017 11:00 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 21041

Re: Common pack design mistakes, how to avoid?

Lets say i had 10g copper wire conductor soldered the nickel strips.
by randyc1
Apr 20, 2017 10:18 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 21041

Re: Common pack design mistakes, how to avoid?

Is this diagram , colors represent current and Heat. In this diagram where the wires are Red will also augment their resistance correct ? ...Will their Higher resistance at red points change the way Current flows through the Pack ? Will More current flow through batteries where heat is less ( not 10...
by randyc1
Apr 19, 2017 12:13 pm
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 21041

Re: Common pack design mistakes, how to avoid?

I mentioned "assuming connections can handle load".

What i want to know is how is Current flowing through the cells,... flowing relatively equal or is one getting much more current than the others ??
Like in shematics on page 1.
by randyc1
Apr 19, 2017 10:57 am
Forum: Battery Technology
Topic: Common pack design mistakes, how to avoid?
Replies: 238
Views: 21041

Re: Common pack design mistakes, how to avoid?

How would this rate for current flow, assuming connections can handle load.
by randyc1
Apr 19, 2017 10:23 am
Forum: Battery Technology
Topic: Another No Solder/Weld 18650 Build (Updated 03/09/2014)
Replies: 328
Views: 45549

Re: Another No Solder/Weld 18650 Build (Updated 03/09/2014)

How would this rate for current flow, assuming connections can handle load.
by randyc1
Feb 21, 2017 7:40 pm
Forum: Battery Technology
Topic: 5.5 Bullet Connectors ,..All the same??
Replies: 4
Views: 382

Re: 5.5 Bullet Connectors ,..All the same??

Brass will probalby hold it's shape and springiness better than copper, which would make them have better connections over time vs copper, if you plug/unplug a fair bit. If you never unplug them then you don't need the connectors, whcih would be lower resistance. ;) Gold is usually just anticorrosi...
by randyc1
Feb 19, 2017 9:48 pm
Forum: Battery Technology
Topic: 5.5 Bullet Connectors ,..All the same??
Replies: 4
Views: 382

5.5 Bullet Connectors ,..All the same??

Some bullet connectors are made of Brass,.. some of Copper. Some gold plated some not ? There must be differences in Resistance ?,.. which are better ?? Copper is much more conductive that Brass, people never seem to talk about what there made of ,.. does it make a difference ? Where to buy Quality ...
by randyc1
Jan 11, 2017 11:34 pm
Forum: Items for Sale - New
Topic: Pulley for kegel orangatang
Replies: 19
Views: 2174

Re: Pulley for kegel orangatang

Idea wrote:
randyc1 wrote:How are these Pulleys holding up ?

Are they still for sale
The offer is still valid :)
What you need?
I first would like to know what they are made of and typically how manny miles they last ???
by randyc1
Jan 11, 2017 5:37 pm
Forum: Items for Sale - New
Topic: Pulley for kegel orangatang
Replies: 19
Views: 2174

Re: Pulley for kegel orangatang

How are these Pulleys holding up ?

Are they still for sale
by randyc1
Dec 13, 2016 11:22 am
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 243
Views: 35111

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

Ohbse can i ask at what Voltage your 30Q were delivered ?

I recieved my 30Q's at 3.447-3.449 V .
by randyc1
Nov 26, 2016 6:33 pm
Forum: Battery Technology
Topic: Are 18650 HG2 or 30Q or 25R cells protected or not?
Replies: 4
Views: 268

Re: Are 18650 HG2 or 30Q or 25R cells protected or not?

Punx0r wrote:You might find versions of these cells that are protected, but the ones used for ebike packs do not include built-in protection. It's not appropriate to use protected cells in large series strings as the voltage exceeds what the protection devices can handle.
Ok thank you !
by randyc1
Nov 25, 2016 10:25 pm
Forum: Battery Technology
Topic: Are 18650 HG2 or 30Q or 25R cells protected or not?
Replies: 4
Views: 268

Are 18650 HG2 or 30Q or 25R cells protected or not?

All these popular 18650 cells we use for e-bikes or e-skates like the HG2 or 30Q,.. are they protected or not ??
by randyc1
Nov 12, 2016 4:44 pm
Forum: Battery Technology
Topic: How to know the battery's charge level
Replies: 6
Views: 391

Re: How to know the battery's charge level

Presice to 1/10 of a volt.
by randyc1
Sep 29, 2016 7:17 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Evolve carbón GT can get 60 km/h
Replies: 2
Views: 450

Re: Evolve carbón GT can get 60 km/h

1- Different Gearing
2- maybe also higher Voltage battery.(12S)
by randyc1
Sep 13, 2016 5:44 pm
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 243
Views: 35111

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

okashira wrote:So the cheapest for 30Q's right now is about $4.40 per cell shipped right now...?

The price i got was 3.40/cell for 100 cells , then there is shipping and fees to take care of ?
by randyc1
Sep 10, 2016 5:36 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 1st Electric Skateboard: Safe Top Speed? kv ratings
Replies: 3
Views: 369

Re: 1st Electric Skateboard: Safe Top Speed? kv ratings

Go with 190 kv, ...you can always go slower if wanted.
by randyc1
Sep 09, 2016 3:16 pm
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 243
Views: 35111

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

ridethelightning wrote:ok, cool ohbse has suggested them too. did they give any idea of the shipping price, shipping method, declarations ect?

shipping is around 1.00/cell , they can lower sale value for customs&taxes to.
by randyc1
Sep 08, 2016 8:40 pm
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 243
Views: 35111

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

ridethelightning wrote:Im looking to score some more 30Q's 8)

Has anyone found a seller of good/genuine cells for price below 3.5usd?
"Shenzhen E-fire Technology Development" has agreed to sell me 100 for 3.40/cell ?, i have not bought yet though.
by randyc1
Aug 27, 2016 3:06 pm
Forum: Battery Technology
Topic: <$2.50 18650s? Cheapest cells per Wh?
Replies: 20
Views: 1346

Re: <$2.50 18650s? Cheapest cells per Wh?

I think going uphill on a e skate would pull more than 30A ?
by randyc1
Aug 27, 2016 3:03 pm
Forum: Battery Technology
Topic: DIY spot-welder, FET-switched, processor-timed adj. pulse
Replies: 598
Views: 36211

Re: DIY spot-welder, FET-switched, processor-timed adj. puls

Riba is this mod needed if welding 0.15 mm nickel ?
by randyc1
Aug 26, 2016 11:47 am
Forum: Battery Technology
Topic: Samsung 30Q INR18650-30Q 3000mah 15a cell
Replies: 243
Views: 35111

Re: Samsung 30Q INR18650-30Q 3000mah 15a cell

It should be similar. What do you think about this quote about a similar cell : "The trouble with HG2 cells is they are more tightly wound and the coulombic efficiency will decrease more rapidly than a similar cell with a Lower capacity like the HE4 or HE2. This is only a problem if driving the cel...