Search found 18 matches

by oscaryu1
May 29 2011 11:50am
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

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das sum boalshiz. First batch like that. Let's see how this ends out..
by oscaryu1
May 21 2011 8:55pm
Forum: Battery Technology
Topic: Are this A123 real or fake?
Replies: 28
Views: 4320

Re: Are this A123 real or fake?

http://i186.photobucket.com/albums/x191/oscaryu1/SANY0422.jpg http://i186.photobucket.com/albums/x191/oscaryu1/SANY0423.jpg http://i186.photobucket.com/albums/x191/oscaryu1/SANY0424.jpg http://i186.photobucket.com/albums/x191/oscaryu1/SANY0425.jpg http://i186.photobucket.com/albums/x191/oscaryu1/SA...
by oscaryu1
May 21 2011 2:11pm
Forum: Battery Technology
Topic: Are this A123 real or fake?
Replies: 28
Views: 4320

Re: Are this A123 real or fake?

Well F*CK. I read this thread AFTER I buy my large lot of A123's.
by oscaryu1
May 21 2011 8:49am
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

True true... but I've gone far to look back. Crapstock or not, the "new" cells actually do perform decently IMO. I had a 5P1S pack, 3.7v actually turn over a forklift motor without even raising the batteries a degree in temperature LOL.... that was surprising.
by oscaryu1
May 20 2011 6:07pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

I'd love to see your research! BTW guys, you're right, the Ultrafire group is mixed. My latest batch was a buncha USED cells with the old spot welds ground off, rusting tabs, nasty green cells with spot welded plates on and new shrinkwrap to make it look all good. I still stand behind the fact that ...
by oscaryu1
May 12 2011 11:07pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

5P14S with those cells makes around a 7.5-8.5Ah 51.8v pack with a bad case of the sags. I'm actually building up to ~96v or so (forgot the exact number), but 5P27S, and FIVE of those XD Yes, a giant sketchy timebomb. It'll be interesting... Using it to power a big forklift motor on a go kart. My bi...
by oscaryu1
May 12 2011 8:29pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

WHAT HAVE I DONE?!

O_O

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I need a couple hundred more cells too lol.
by oscaryu1
Apr 11 2011 7:16pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

Blue 18650's don't have the endcaps the red ones do, but they do have a top cap, spot welded with some rather thin (1/8" wide) tabs, which is then spot welded to the top of the battery. o_o :?:
by oscaryu1
Apr 04 2011 9:10pm
Forum: E-Bike Technical
Topic: YK43 Modifications for higher voltage/amperage?
Replies: 0
Views: 364

YK43 Modifications for higher voltage/amperage?

Hey guys! I finally got a YK43 I can play around with and not be afraid to blow it if something goes wrong :) I'm hoping to push ~100V through it, and 200A+. It's a tall order, no doubt, but seeing that a member here peaked it at 105A stock, I'm confident it shouldn't be an overly complicated task x...
by oscaryu1
Apr 01 2011 11:53pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

I have 27 more I can swap around in random pairs and try if you'd like me to :P I don't have a balance charger unfortunately (I charge the cells up individually, and then put them in series). I have a balance charger for LiPo's, however, can probably adapt them somehow. Yeah, that's what I was think...
by oscaryu1
Apr 01 2011 9:34pm
Forum: E-Bike General Discussion
Topic: 18650 Li-ion at $145 per KiloWatt Hour!
Replies: 123
Views: 22501

Re: 18650 Li-ion at $145 per KiloWatt Hour!

ohay guys, random "first"ish post, but my review of these batteries, which I'm planning to put in a gigantic pack for a EV go kart. Same batteries as listed, LC 18650 Ultrafire 3800mAh's. Took quite a while to charge. http://i186.photobucket.com/albums/x191/oscaryu1/1f3b49a4.jpg I hooked up 3 in ser...
by oscaryu1
Dec 14 2010 8:29pm
Forum: General Discussion
Topic: [Fake] yellow A123's?
Replies: 5
Views: 700

Re: [Fake] yellow A123's?

eBay, a few dollars a cell.
by oscaryu1
Dec 12 2010 8:47pm
Forum: General Discussion
Topic: [Fake] yellow A123's?
Replies: 5
Views: 700

[Fake] yellow A123's?

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Are they fake? And say they were, are the discharge/recharge rates and life similar to genuine A123's? Thanks guys! :)
by oscaryu1
Sep 13 2010 4:53pm
Forum: E-Bike Technical
Topic: Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE! (:
Replies: 9
Views: 2566

Re: Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE!

Really? I have a 900W motor (Currie Technology), 900W at 24V and I was running it at 48V! http://www.youtube.com/watch?v=txyDd3VvI9M The scooter is dead now, the handlebars cracked twice (welded it back), went through one set of 7/8aH batteries like nothing (upgraded to 10aH), three or so throttles,...
by oscaryu1
Sep 12 2010 9:09pm
Forum: E-Bike Technical
Topic: Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE! (:
Replies: 9
Views: 2566

Re: Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE!

Three controllers running off of one small set of batteries due to frame limitations just wouldn't be practical, nor would it be very cost efficient. I know for a fact people with 48V models of this (called the YK-42) have modified these for 2000-3000W motors and ran over 130V+ on them (Although the...
by oscaryu1
Sep 12 2010 6:27pm
Forum: E-Bike Technical
Topic: Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE! (:
Replies: 9
Views: 2566

Modifying Yiyun YK-43 for more amperage? :D HELP PLEASE! (:

Ohai guys, new member here, I'm only 15, so please be patient with me :D I'm trying to mod up this 60V Yiyun controller for more amperage - it can power a 24V 900W motor at 48V perfectly, however, it now has to power THREE 36V motors rated at 750W apiece :shock: :oops: http://i186.photobucket.com/al...