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Headways (Was: Anyone have dealings with VoltPhreaks -- impressive 15C LiFePO4 claims?)
by Ian Hooper-3
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Yeah.. that was me doing the tests :)
Oh I thought the 38120 Headways were alright.. definitely more
powerful than ThunderSky LFPs, and significantly cheaper/easier than
using 26650s, so they have their niche. Rated cycle life of 1000 seems
a bit low for LiFePO4 (and I didn't do cycle testing), I wonder if
they're just being conservative or if they do actually cut corners in
manufacturing which results in a lower cycle life? 1000 is still
better than most chemistries, of course..
While we're on the subject, is anyone actually running Headways in an
EV yet? We're currently gearing up for the next conversion project at
this end and definitely want something more powerful than ThunderSkys..
Ian Hooper
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world." - Margaret Mead
http://www.zeva.com.au
On 21/07/2008, at 8:33 AM, Roger Heuckeroth wrote:
> Zeva did a review on some larger Headway cells. See http://zeva.com.au/tech/headway/
> They were not to impressed.
>
> On Jul 20, 2008, at 11:33 AM, Ian Hooper wrote:
>
>> It's not really that unbelievable - the specs are more modest than
>> many 18650s I've tested. Pretty good price though, significantly
>> cheaper than K2 or PHET. The closeup shows the text on the cell
>> starts
>> with abbreviation "HW" - manufactured by Headway perhaps?
>>
>> On a side note, I imagine it'd be pretty tedious building an EV-sized
>> pack from 1100mAh cells!
>>
>> Ian Hooper
>> --
>> "Never doubt that the work of a small group of thoughtful, committed
>> citizens can change the world." - Margaret Mead
>> http://www.zeva.com.au
>>
>> On 20/07/2008, at 11:11 PM, txhokie4life wrote:
>>
>>>
>>>
>>>
>>> https://s.p10.hostingprod.com/@.../ssl/catalog/product_info.php?cPath=1_23&products_id=31
>>> VoltPhreaks 1.1Ah 10C continuous 15C max 18650 cell????
>>>
>>> Probably bunk -- but impressive looking cell on "paper".
>>>
>>> M
>>> --
>>> View this message in context: http://www.nabble.com/Anyone-have-dealings-with-VoltPhreaks----impressive-15C-LiFePO4-claims--tp18555346p18555346.html
>>> Sent from the Electric Vehicle Discussion List mailing list archive
>>> at Nabble.com.
>>>
>>>
>>> _______________________________________________
>>> For general EVDL support, see http://evdl.org/help/
>>> For subscription options, see http://lists.sjsu.edu/mailman/
>>> listinfo/
>>> ev
>>>
>>>
>>
>>
>> _______________________________________________
>> For general EVDL support, see http://evdl.org/help/
>> For subscription options, see http://lists.sjsu.edu/mailman/listinfo/
>> ev
>
>
> _______________________________________________
> For general EVDL support, see http://evdl.org/help/
> For subscription options, see http://lists.sjsu.edu/mailman/listinfo/
> ev
>
>
_______________________________________________
For general EVDL support, see http://evdl.org/help/
For subscription options, see http://lists.sjsu.edu/mailman/listinfo/ev
Oh I thought the 38120 Headways were alright.. definitely more
powerful than ThunderSky LFPs, and significantly cheaper/easier than
using 26650s, so they have their niche. Rated cycle life of 1000 seems
a bit low for LiFePO4 (and I didn't do cycle testing), I wonder if
they're just being conservative or if they do actually cut corners in
manufacturing which results in a lower cycle life? 1000 is still
better than most chemistries, of course..
While we're on the subject, is anyone actually running Headways in an
EV yet? We're currently gearing up for the next conversion project at
this end and definitely want something more powerful than ThunderSkys..
Ian Hooper
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world." - Margaret Mead
http://www.zeva.com.au
On 21/07/2008, at 8:33 AM, Roger Heuckeroth wrote:
> Zeva did a review on some larger Headway cells. See http://zeva.com.au/tech/headway/
> They were not to impressed.
>
> On Jul 20, 2008, at 11:33 AM, Ian Hooper wrote:
>
>> It's not really that unbelievable - the specs are more modest than
>> many 18650s I've tested. Pretty good price though, significantly
>> cheaper than K2 or PHET. The closeup shows the text on the cell
>> starts
>> with abbreviation "HW" - manufactured by Headway perhaps?
>>
>> On a side note, I imagine it'd be pretty tedious building an EV-sized
>> pack from 1100mAh cells!
>>
>> Ian Hooper
>> --
>> "Never doubt that the work of a small group of thoughtful, committed
>> citizens can change the world." - Margaret Mead
>> http://www.zeva.com.au
>>
>> On 20/07/2008, at 11:11 PM, txhokie4life wrote:
>>
>>>
>>>
>>>
>>> https://s.p10.hostingprod.com/@.../ssl/catalog/product_info.php?cPath=1_23&products_id=31
>>> VoltPhreaks 1.1Ah 10C continuous 15C max 18650 cell????
>>>
>>> Probably bunk -- but impressive looking cell on "paper".
>>>
>>> M
>>> --
>>> View this message in context: http://www.nabble.com/Anyone-have-dealings-with-VoltPhreaks----impressive-15C-LiFePO4-claims--tp18555346p18555346.html
>>> Sent from the Electric Vehicle Discussion List mailing list archive
>>> at Nabble.com.
>>>
>>>
>>> _______________________________________________
>>> For general EVDL support, see http://evdl.org/help/
>>> For subscription options, see http://lists.sjsu.edu/mailman/
>>> listinfo/
>>> ev
>>>
>>>
>>
>>
>> _______________________________________________
>> For general EVDL support, see http://evdl.org/help/
>> For subscription options, see http://lists.sjsu.edu/mailman/listinfo/
>> ev
>
>
> _______________________________________________
> For general EVDL support, see http://evdl.org/help/
> For subscription options, see http://lists.sjsu.edu/mailman/listinfo/
> ev
>
>
_______________________________________________
For general EVDL support, see http://evdl.org/help/
For subscription options, see http://lists.sjsu.edu/mailman/listinfo/ev
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