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K2 vs. StarkPower LiFePo4 batteries



 
 
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  #11  
Old February 4th 15, 06:08 PM posted to rec.aviation.soaring
jfitch
external usenet poster
 
Posts: 1,134
Default K2 vs. StarkPower LiFePo4 batteries

On Tuesday, February 3, 2015 at 3:50:28 PM UTC-8, Dave Springford wrote:
I'll preface my remarks with the statement that I sell K2 batteries.

The K2's are made in the USA, not Chinese knock-offs. K2 pays a fee to the patent holder while the knock-off's do not. K2 has also had their batteries UL certified and listed.

These items account for some of the price difference.

The K2 also have a higher Watt-hour rating at 123 vs 115 for the Stark and the K2 are rated for 25 amp continuous discharge vs 15 for the Stark. The K2's also have a better temperature range.

In my opinion, the K2 is a superior product and is worth the extra cost.

I sell K2 batteries with the protection module for $150 US and chargers for $30 US and will have some on hand at the Seniors at Seminole Lake. For any one interested in purchasing a K2, contact me at the address below.

Dave Springford
dave at foxonecorp dot com


I don't believe anyone is building cells in North America for the consumer market. These are all coming from China. It makes no sense at all to build the BMS boards here either. So as a point of differentiation between vendors, there is nothing in it.
  #12  
Old February 4th 15, 06:37 PM posted to rec.aviation.soaring
Charlie M. (UH & 002 owner/pilot)
external usenet poster
 
Posts: 1,383
Default K2 vs. StarkPower LiFePo4 batteries

On Wednesday, February 4, 2015 at 12:08:54 PM UTC-5, jfitch wrote:
On Tuesday, February 3, 2015 at 3:50:28 PM UTC-8, Dave Springford wrote:
I'll preface my remarks with the statement that I sell K2 batteries.

The K2's are made in the USA, not Chinese knock-offs. K2 pays a fee to the patent holder while the knock-off's do not. K2 has also had their batteries UL certified and listed.

These items account for some of the price difference.

The K2 also have a higher Watt-hour rating at 123 vs 115 for the Stark and the K2 are rated for 25 amp continuous discharge vs 15 for the Stark. The K2's also have a better temperature range.

In my opinion, the K2 is a superior product and is worth the extra cost.

I sell K2 batteries with the protection module for $150 US and chargers for $30 US and will have some on hand at the Seniors at Seminole Lake. For any one interested in purchasing a K2, contact me at the address below.

Dave Springford
dave at foxonecorp dot com


I don't believe anyone is building cells in North America for the consumer market. These are all coming from China. It makes no sense at all to build the BMS boards here either. So as a point of differentiation between vendors, there is nothing in it.


As an avid "Electric RC'er", while you are likely correct that most cells come from a limited number of places, where they end up can be a case of, "Give me cells" vs. "I don't want seconds/low performers".....
Price is not always a guarantee (there is a "very high priced" LiPO hobby vendor that has performance numbers similar to "mid level" vendors.....), but it can help out as well as "post sale support".

Not saying anything for/against any vendor mentioned here, just a different view.
  #13  
Old February 5th 15, 12:19 PM posted to rec.aviation.soaring
Jim White[_3_]
external usenet poster
 
Posts: 286
Default K2 vs. StarkPower LiFePo4 batteries

Reading the blurb referenced it would seem that the A123 batteries (which
are available from http://www.buya123batteries.com) seem to have the best
protection / charging electronics they only rated at 5Ah although this
should provide better performance than a 7Ah SLA.

The higher power batteries do not seem to have all the tricks in the
electronics.

Interesting note: although A123 is a US company using MIT derived
technology, they are owned by the Chinese!


At 17:37 04 February 2015, Charlie M. UH & 002 owner/pilot wrote:
On Wednesday, February 4, 2015 at 12:08:54 PM UTC-5, jfitch wrote:
On Tuesday, February 3, 2015 at 3:50:28 PM UTC-8, Dave Springford

wrote:
I'll preface my remarks with the statement that I sell K2 batteries.

The K2's are made in the USA, not Chinese knock-offs. K2 pays a fee

to
the patent holder while the knock-off's do not. K2 has also had their
batteries UL certified and listed.

These items account for some of the price difference.

The K2 also have a higher Watt-hour rating at 123 vs 115 for the

Stark
and the K2 are rated for 25 amp continuous discharge vs 15 for the Stark.
The K2's also have a better temperature range.

In my opinion, the K2 is a superior product and is worth the extra

cost.

I sell K2 batteries with the protection module for $150 US and

chargers
for $30 US and will have some on hand at the Seniors at Seminole Lake.

For
any one interested in purchasing a K2, contact me at the address below.

Dave Springford
dave at foxonecorp dot com


I don't believe anyone is building cells in North America for the

consumer market. These are all coming from China. It makes no sense at

all
to build the BMS boards here either. So as a point of differentiation
between vendors, there is nothing in it.

As an avid "Electric RC'er", while you are likely correct that most cells
come from a limited number of places, where they end up can be a case of,
"Give me cells" vs. "I don't want seconds/low performers".....
Price is not always a guarantee (there is a "very high priced" LiPO hobby
vendor that has performance numbers similar to "mid level" vendors.....),
but it can help out as well as "post sale support".

Not saying anything for/against any vendor mentioned here, just a

different
view.


  #14  
Old February 5th 15, 02:58 PM posted to rec.aviation.soaring
Ron Gleason
external usenet poster
 
Posts: 483
Default K2 vs. StarkPower LiFePo4 batteries

On Thursday, 5 February 2015 04:30:04 UTC-7, Jim White wrote:
Reading the blurb referenced it would seem that the A123 batteries (which
are available from http://www.buya123batteries.com) seem to have the best
protection / charging electronics they only rated at 5Ah although this
should provide better performance than a 7Ah SLA.

The higher power batteries do not seem to have all the tricks in the
electronics.

Interesting note: although A123 is a US company using MIT derived
technology, they are owned by the Chinese!


At 17:37 04 February 2015, Charlie M. UH & 002 owner/pilot wrote:
On Wednesday, February 4, 2015 at 12:08:54 PM UTC-5, jfitch wrote:
On Tuesday, February 3, 2015 at 3:50:28 PM UTC-8, Dave Springford

wrote:
I'll preface my remarks with the statement that I sell K2 batteries.

The K2's are made in the USA, not Chinese knock-offs. K2 pays a fee

to
the patent holder while the knock-off's do not. K2 has also had their
batteries UL certified and listed.

These items account for some of the price difference.

The K2 also have a higher Watt-hour rating at 123 vs 115 for the

Stark
and the K2 are rated for 25 amp continuous discharge vs 15 for the Stark.
The K2's also have a better temperature range.

In my opinion, the K2 is a superior product and is worth the extra

cost.

I sell K2 batteries with the protection module for $150 US and

chargers
for $30 US and will have some on hand at the Seniors at Seminole Lake.

For
any one interested in purchasing a K2, contact me at the address below.

Dave Springford
dave at foxonecorp dot com

I don't believe anyone is building cells in North America for the

consumer market. These are all coming from China. It makes no sense at

all
to build the BMS boards here either. So as a point of differentiation
between vendors, there is nothing in it.

As an avid "Electric RC'er", while you are likely correct that most cells
come from a limited number of places, where they end up can be a case of,
"Give me cells" vs. "I don't want seconds/low performers".....
Price is not always a guarantee (there is a "very high priced" LiPO hobby
vendor that has performance numbers similar to "mid level" vendors.....),
but it can help out as well as "post sale support".

Not saying anything for/against any vendor mentioned here, just a

different
view.


http://en.wikipedia.org/wiki/A123_Systems as you can read this company started out in Massachusetts and received US Government grants, went bankrupt and was bough by the Chinese.
  #15  
Old February 9th 15, 04:58 PM posted to rec.aviation.soaring
6PK
external usenet poster
 
Posts: 242
Default K2 vs. StarkPower LiFePo4 batteries

On Tuesday, February 3, 2015 at 1:47:54 AM UTC-8, Fox Two wrote:
Are there significant differences between these batteries? Why is there a 50% difference in their cost? I've noticed that some brands have more restrictive low temperature limits - not good for those cold wave flights!

Chris


I purchased a "Bioenno Power" 12v 12ah(LiFePO4) battery and charger and used it for over a year now with no problems. Cost $136.99 which includes the charger.
http://www.bioennopower.com/collecti...ifepo4-battery
Any comment on this brand out there?
6PK
  #16  
Old February 9th 15, 09:48 PM posted to rec.aviation.soaring
son_of_flubber
external usenet poster
 
Posts: 1,550
Default K2 vs. StarkPower LiFePo4 batteries

On Monday, February 9, 2015 at 10:58:56 AM UTC-5, 6PK wrote:

http://www.bioennopower.com/collecti...ifepo4-battery
Any comment on this brand out there?


Found this on bioenno website. Are the ISO certs significant?

"As an OEM, Bioenno Power conducts technology development, product design and markets a variety of products. Our company has engineering, and small scale manufacturing facilities in Santa Ana, CA. For large-scale manufacturing, the company uses overseas contract manufacturers (CMs) to carry out production according to Bioenno Power's designs and requirements. Our CMs have fully implemented the ISO quality management system, and have ISO9001:2008 and ISO14001 certifications, which ensure a consistent process, stable performance, and high reliability."
  #17  
Old April 14th 15, 10:48 PM posted to rec.aviation.soaring
Ramy[_2_]
external usenet poster
 
Posts: 601
Default K2 vs. StarkPower LiFePo4 batteries

On Tuesday, February 3, 2015 at 3:33:38 AM UTC-8, wrote:
We have been selling the Starkpower battery for more than a year now. Started out very cautiously - selling only a few to a few of our steady customers. We have now sold several hundred with no complaints. They really are great and are exactly the same size as the battery they replace.

One caution is you must use the special charger (inexpensive) that shuts off when the battery reaches a fully charged state.

Tom Knauff
Knauff & Grove, Inc
Ridge Soaring Gliderport

www.eglider.org


Can one charger charge two identical starkpower batteries in parallel?

Ramy
  #18  
Old April 14th 15, 11:51 PM posted to rec.aviation.soaring
Jonathan St. Cloud
external usenet poster
 
Posts: 1,463
Default K2 vs. StarkPower LiFePo4 batteries

After having two dogs piosoned by Chinese dog food (did not even know the food was made in China) I try very hard not to buy anything made in China. Plus they are well know to steal as much intellectual property as possible.

On Tuesday, February 3, 2015 at 4:20:56 PM UTC-8, son_of_flubber wrote:

I also don't buy baby formula that is made in China.

Of course I buy all sorts of non-critical well made components/products from China. And they do a good job on things like the Iphone. But any commodity item like batteries is going to be a 'race to the bottom'.

I've no certainty that K2 is any more robust, but one can hope. UL labs is still a good operation.

  #19  
Old April 15th 15, 12:29 AM posted to rec.aviation.soaring
JS
external usenet poster
 
Posts: 1,384
Default K2 vs. StarkPower LiFePo4 batteries

I have used and charged two 10AH LiFePO4 batteries in parallel sans probleme.
Jim

On Tuesday, April 14, 2015 at 2:48:04 PM UTC-7, Ramy wrote:

Can one charger charge two identical starkpower batteries in parallel?

Ramy


  #20  
Old April 15th 15, 12:39 AM posted to rec.aviation.soaring
Charlie M. (UH & 002 owner/pilot)
external usenet poster
 
Posts: 1,383
Default K2 vs. StarkPower LiFePo4 batteries

On Tuesday, April 14, 2015 at 5:48:04 PM UTC-4, Ramy wrote:
On Tuesday, February 3, 2015 at 3:33:38 AM UTC-8, wrote:
We have been selling the Starkpower battery for more than a year now. Started out very cautiously - selling only a few to a few of our steady customers. We have now sold several hundred with no complaints. They really are great and are exactly the same size as the battery they replace.

One caution is you must use the special charger (inexpensive) that shuts off when the battery reaches a fully charged state.

Tom Knauff
Knauff & Grove, Inc
Ridge Soaring Gliderport

www.eglider.org


Can one charger charge two identical starkpower batteries in parallel?

Ramy


You can, not really recommended. Typical in charging ANY batteries in parallel.
 




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