Search found 1436 matches

by deVries
Sep 17 2013 3:27pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

Outer dimensions are same as the 20Ah cell, only it's thinner. Not sure what the weight is offhand. That makes good sense to standardize on the same form factor as the 20Ah to use some of the same manufacturing equipment and material sizes. PRICES need to come down! Hey, and that is my rant. :twist...
by deVries
Sep 17 2013 2:57pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

I'd have to say these were from experimental builds [...] possibly precursors to the 14Ah cell I'm familiar with today. Just for comparison purposes what is the cell weight and dimensions of the 14Ah cells made today??? Here is the Korean experimental cell info: Capacity: 15Ah Size: 6.8mm x 150mm x...
by deVries
Sep 17 2013 2:15pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

I would believe that the large quantity of 20ah and 16ah cells I bought from cellman in 2009 were experimental or preproduction - and he only ran out of them because my second order bought every 20ah and 16ah cell he had left. Sorry Oatnet, you bought your cells in 2010 not 2009. Cellman just start...
by deVries
Sep 17 2013 1:46pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

Here is a better version of this pic to identify this... it seems it is an official production cell and not experimental.

A123 Korean 15/14Ah Production Cell ???

Some easily identifiable alphanumeric markings are:

EF68150211 and RGH6003-29B228

:twisted:
by deVries
Sep 17 2013 1:03pm
Forum: Battery Technology
Topic: NMC vs LiPo charging
Replies: 39
Views: 4072

Re: NMC vs LiPo charging

NMC is not naturally as conductive of a material as cobalt oxides, so seeing 15C is a bit beyond the normal discharge rate window NMC cells are designed to handle. The biggest advantage of NMC is safety and longevity in cycling. Can you give us some opinions on these issues with A123 chemistry vs t...
by deVries
Sep 17 2013 9:47am
Forum: Battery Technology
Topic: A123 20Ah Pressure Thoughts--and bits for experiments.
Replies: 235
Views: 19721

Re: A123 20Ah Pressure Thoughts--and bits for experiments.

A question for WB9K... How long ago did A123 publish information about using prismatic cell pouches properly by applying equal psi over the entire cell "stacked surface" area using some recommended range of psi? Was this published info available to anyone wanting to build batteries from these cells?...
by deVries
Sep 16 2013 9:52pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

After proper interpretation of any markings on the cells, dimensions and weight would probably be the most illuminating... Several of the top engineers from that Korea plant now work in Livonia. They're some sharp guys (and gals); experimental builds from Korea are definitely possible. They happen ...
by deVries
Sep 16 2013 6:49pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

Limited experimental runs of other sizes are possible, but I have no awareness of anything in that size. It can't be ruled out, not be me anyway. Experimental runs would explain it IF these really did come from the A123 Korean plant. There is NO PROOF that even happened, though apparently there are...
by deVries
Sep 16 2013 6:34pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

Not that I'm aware of. There is a 14Ah cell that was first built in Korea. They are now built in limited quantities in Livonia, but I don't think those have been offered to anyone except as engineering samples. Price will be 2.5USD per Ah for bare cells :) Maybe some small additional fee for pack a...
by deVries
Sep 16 2013 5:50pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

wb9k wrote:Devil's always in the details, isn't it? I don't believe A123 has ever made a 17Ah cell--not on purpose anyway.
Did A123 ever sell and make cells from the Korean plant that were 15Ah/16Ah prismatic pouch cells???
by deVries
Sep 16 2013 5:46pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

I did do a search today and only could find that you did document build(s) before 2012 with A123 15Ah cells. Show us your build threads with 20Ah cells before 2012. HaHaHaHa - you think the 16ah cells are something different... :lol:  Thanks for proving my point again. Well, JD/Oatnet by your very ...
by deVries
Sep 16 2013 12:06pm
Forum: General Discussion
Topic: Made in china. Avoid.
Replies: 27
Views: 2045

Re: Made in china. Avoid.

:lol: :twisted: 8)
by deVries
Sep 15 2013 12:03pm
Forum: Battery Technology
Topic: Charging at 247 Amperes
Replies: 2
Views: 346

Re: Charging at 247 Amperes

How much $ is it to charge per charge or by subscription at Public Access charging stations where you live in Quebec Doctorbass??? Some of these Super Power charge stations you mention here are being installed in Austin, TX next year 2014. Everyone is invited to post your public charge info linked h...
by deVries
Sep 15 2013 9:50am
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Moderators, if this belongs in the "For Sale" section, please feel free to move the thread. This thread/topic needs to remain here in the technical battery section, and it will not become a sales thread. This is a technical thread meant to deal with all technical aspects of these modules and mods, ...
by deVries
Sep 14 2013 6:14pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

I'm using some recycled first gen. Hymotion A123 bricks on my bike. I cut one cell out of the middle of each 11p group, making two 5p groups. I have a 10Ah 16s pack about the size of shoebox. A123 pack1.jpg Hey, great idea and post Fechter... 8) Maybe 'that' shoebox size is small enough for a Bromp...
by deVries
Sep 14 2013 3:33pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

The size of the very well constructed 8s11p 26v module is about 12" x 5.5" x 6"H. 8s11p Hymotion Module Small.jpg Is that the dimension of an 8S11P module? Yes, exactly! Because the pic I see doesn't looks like 12 inches by 5.5 inches. That actually is the top view of the 8s11p module, and those ar...
by deVries
Sep 14 2013 3:09pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Yeah and I took your word for that stolen crap and got banned for 30 days for repeating it. What proof do you have they were stolen ? Well, since someone else has let this cat out of the bag, I "overheard" [unnamed A123 source] the defective cells and modules were sold to a recycle contractor under...
by deVries
Sep 14 2013 2:21pm
Forum: Battery Technology
Topic: DIY Programmable BMS (now using ATtiny/Arduino)
Replies: 218
Views: 38069

Re: DIY Modular BMS

As of right now I have 10 bare 4 cell balancing PCBs remaining. If anybody wants to build some themselves, I'll happily sell you the bare boards for cheap ($5 each plus shipping) and share the design data with you (bom, schematic, etc). Warning though, they are all surface mount parts, don't bother...
by deVries
Sep 14 2013 1:53pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Thanks for the post of useful information on these modules. So, these would come directly from Sybesma's? Any cost figures available yet? Are these new, older cells, more or less unused? Or are they recycled packs? wb9k wrote: These cells were definitely A grade under the old 26650 spec, and buyers...
by deVries
Sep 14 2013 1:40pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Bike battery should weight around 5kg max for optimal handling. I'm currently having my 12kg A123 20AH on my brompton and it's definitely too heavy. Yeah, your Brompton is a very small bike. No way you could consider using 2 of these modules unless you could use 26v and one module. Also, if weight ...
by deVries
Sep 14 2013 1:13pm
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Somehow it does look chunky for ebike? The size of the very well constructed 8s11p 26v module is about 12" x 5.5" x 6"H The above dimensions will give you the best idea. These modules are automotive professional grade highest quality construction. This is waayyy beyond any hobby build or Ping-chine...
by deVries
Sep 14 2013 12:48pm
Forum: Battery Technology
Topic: [rant] If A123 cells are so great....
Replies: 136
Views: 8719

Re: [rant] If A123 cells are so great....

You might be interested in some of the Hymotion modules that Hank Sybesma has and will be making available very soon, along with test results for each module they sell. More information, please! and thanks again! new tread post request on Hymotion. I want one for my canoe motor too. :) Here is the ...
by deVries
Sep 14 2013 11:41am
Forum: Battery Technology
Topic: Coming Soon A123 Hymotion Modules for ES and ALL
Replies: 58
Views: 5467

Re: Coming Soon A123 Hymotion Modules for ES and ALL

Here is the PDF technical guide written by an A123 expert that also works for A123 too...

Guide to A123 Hymotion Battery Modules

(Only the battery-module cells are an A123 product.)

.