Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc. - Page 17 - DIY Electric Car Forums
Go Back  

DIY Electric Car Forums > EV Conversions and Builds > Batteries and Charging

Register Blogs FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

View Poll Results: What are the best LiFePo Battery for your $ -Thunder Sky, CALB, Headway, Hi-Power?
Thunder Sky (http://www.thunder-sky.com/products_en.asp) 49 37.40%
CALB (http://en.calb.cn) 60 45.80%
Headway (http://www.headway-cn.com) 17 12.98%
Hi-Powers (http://www.hipowergroup.com) 5 3.82%
A123 (http://www.a123systems.com) 15 11.45%
Multiple Choice Poll. Voters: 131. You may not vote on this poll

Reply
 
Thread Tools Display Modes
  #161  
Old 04-18-2012, 10:44 AM
Ziggythewiz's Avatar
Ziggythewiz Ziggythewiz is offline
Senior Member
 
Join Date: May 2010
Location: Houston
Posts: 3,987
Ziggythewiz will become famous soon enough
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by lowcrawler View Post
Is there a way to turn off the MiniBMS, say, for storage over winter? It would suck to have the MiniBMS take your cells down to harmful DoD levels....
Sure...
__________________
1 EV - 11,350 e-miles in 2.5 years (7/25/13) - http://www.evalbum.com/4000
Reply With Quote
Sponsored Links
Advertisement
 
  #162  
Old 04-18-2012, 10:45 AM
sinopoly.david sinopoly.david is offline
Member
 
Join Date: Sep 2011
Posts: 35
sinopoly.david is on a distinguished road
Wink Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by lowcrawler View Post
Is there a way to turn off the MiniBMS, say, for storage over winter? It would suck to have the MiniBMS take your cells down to harmful DoD levels....
The best way I think if you don't want to use battery, you'd better to recharge battery after 2~3 months
Reply With Quote
  #163  
Old 04-18-2012, 11:04 AM
MN Driver MN Driver is offline
Senior Member
 
Join Date: Sep 2009
Posts: 870
MN Driver is on a distinguished road
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by sinopoly.david View Post
I missunderstand...Thank you, Sir, But I don't know Jack Rickard's email. Can you tell me? I contact with Justin for distributing our cells in US recently.
info@evtv.me
Reply With Quote
  #164  
Old 04-18-2012, 11:10 AM
sinopoly.david sinopoly.david is offline
Member
 
Join Date: Sep 2011
Posts: 35
sinopoly.david is on a distinguished road
Wink Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by MN Driver View Post
Thank you. I just opened his website and sent an email to him.
Reply With Quote
  #165  
Old 04-07-2013, 06:35 AM
JRP3's Avatar
JRP3 JRP3 is offline
Senior Member
 
Join Date: Mar 2008
Location: Central New York
Posts: 7,897
JRP3 will become famous soon enoughJRP3 will become famous soon enough
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Taking a quick look your maximum C rates are not very good. Also you are spamming a lot of battery threads so you might want to slow down a bit.
Reply With Quote
  #166  
Old 04-07-2013, 06:59 AM
noleanderthegreat noleanderthegreat is offline
Junior Member
 
Join Date: Nov 2012
Location: Los Angeles
Posts: 2
noleanderthegreat is on a distinguished road
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

How many people have actually used those Heter cells? I think almost nobody, especially not anyone whose opinion really has significance on this subject. Seems only newbies would consider a battery with those specs for anything.
I wouldn't even try them out for evaluation.

CALB-36 cells with no BMS, after top balance and daily charge/discharge cycles, the cells are very closely matched with no drift. Best LiFePO4 cell I have used.
GBS- I haven't found anything good or bad about the cells. I have abused them and the surefire ways to kill them is charging to over 4.2 volts or bringing them under .5 volts. The problem for me is cycle life, low C rates and cost too high. I like the plastic cases that come with the 20Ah-12volt packs, and it's a very convenient way to get batteries, as they have quick shipping times.
Thunder-Sky- Garbage. My cells are utterly useless after doing an initial top balance and installing a BMS. None of the cells were over charged or undercharged, they immediately became imbalanced and nothing I tried helped that, except very low C rates (they were in a motorcycle before). Now they are used as UPS batteries, for which they aredecent, albeit expensive.
Headway-Poor cost performance, I would never buy them again. They didn't stay in balance well enough, but were not as bad as TS cells. Their cost is undeservedly high for what you get, as there isn't any benefit I can find for cylindrical cells.

I stick with what I've tried and CALB beats all other cells by a long shot in every single category. I am using a very small pack (36s1p@40Ah) to push around my VW Beetle and they only put out a max of 350 amps, but they don't heat up excessively or seem to otherwise mind being used as such a tiny pack in a car. I would have done better with 70Ah cells, even at a bit lower voltage, as the larger Ah cells would not sag as far (from fully charged pack, mine sags to ~85 volts under WOT).
Reply With Quote
  #167  
Old 04-07-2013, 07:37 AM
trukr trukr is offline
Member
 
Join Date: Mar 2013
Location: Winnipeg -40
Posts: 43
trukr is on a distinguished road
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by noleanderthegreat View Post
GBS- I haven't found anything good or bad about the cells. I have abused them and the surefire ways to kill them is charging to over 4.2 volts or bringing them under .5 volts. The problem for me is cycle life, low C rates and cost too high. I like the plastic cases that come with the 20Ah-12volt packs, and it's a very convenient way to get batteries, as they have quick shipping times.
I was looking into these cells because of their claimed 90% efficiency at -20C. I did notice the 1500 cycle life, but the C rating was 3C and 10C pulsed. Was your experience with them much less?

Seen your vid BTW. Slowed me right down. I went from add to cart, to sniffing for snake oil.
Reply With Quote
  #168  
Old 04-07-2013, 08:55 AM
Siwastaja's Avatar
Siwastaja Siwastaja is offline
Senior Member
 
Join Date: Jul 2012
Location: Finland
Posts: 566
Siwastaja is on a distinguished road
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by trukr View Post
I was looking into these cells because of their claimed 90% efficiency at -20C.
Efficiency depends on both internal resistance, which depends on temperature, and power you are (dis)charging with. Low temperature increases internal resistance and hence lowers the efficiency, but if there is only little load, efficiencies near 100% can still be achieved.

At high load currents the efficiency can be very poor in cold, but it's exactly that loss that heats up the battery and therefore increases the efficiency again.

There is no single efficiency number for batteries, at least it depends on power. There is a maximum figure for a given chemistry (achieved at very low discharge currents) and for li-ion, that's very close to 100%.
Reply With Quote
  #169  
Old 04-08-2013, 09:12 AM
trukr trukr is offline
Member
 
Join Date: Mar 2013
Location: Winnipeg -40
Posts: 43
trukr is on a distinguished road
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

Quote:
Originally Posted by Siwastaja View Post
Efficiency depends on both internal resistance, which depends on temperature, and power you are (dis)charging with. Low temperature increases internal resistance and hence lowers the efficiency, but if there is only little load, efficiencies near 100% can still be achieved.

At high load currents the efficiency can be very poor in cold, but it's exactly that loss that heats up the battery and therefore increases the efficiency again.

There is no single efficiency number for batteries, at least it depends on power. There is a maximum figure for a given chemistry (achieved at very low discharge currents) and for li-ion, that's very close to 100%.
Thanks for clarifying this for me. Tried to read up on this a little bit, and found numbers of 0.2C to work with. On a 144V 100ah system, that would leave me with what, less than 4hp to work with continuous? I think a temp controlled battery box that can be plugged in is a must.

I guess my biggest concern is cycle life due to cold temps. If the pack's temp was stabilized during and prior to charge or discharge, will that save cycle life even if the temp is allowed outside optimum when not in use?
Reply With Quote
  #170  
Old 04-08-2013, 10:23 AM
Ziggythewiz's Avatar
Ziggythewiz Ziggythewiz is offline
Senior Member
 
Join Date: May 2010
Location: Houston
Posts: 3,987
Ziggythewiz will become famous soon enough
Default Re: Lithium Battery compared - Thunder Sky, CALIB, Headway, Hi-Powers, etc.

When not in use pack temp won't matter but if you let all that thermal mass get low it would probably take a while to safely bring it up. You're probably best off planning enough insulation so only the outer cells ever get cold enough to need the heating.
__________________
1 EV - 11,350 e-miles in 2.5 years (7/25/13) - http://www.evalbum.com/4000
Reply With Quote
Reply

Share or Bookmark this

Tags
calib, headway, hi-powers, lithium battery, thunder sky

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

 
Support DIY Electric Car
Sponsors

All times are GMT -6. The time now is 07:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Ad Management by RedTyger