Matronics Email Lists :: View topic - Lithium Polymer start battery

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Lithium Polymer start battery

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

frans(at)paardnatuurlijk.
Guest

Posted: Wed Oct 01, 2008 2:55 am Post subject: Lithium Polymer start battery

The last few years there has been tremendous progress on the development of small and light weight batteries.

Take this for example: a 11,1 Volt 5Ah battery, capable of providing 150 Amp crank power, weighing only 0,384 Kg (for the non-metric guys: less than one pound, do the math yourself).



[url]http://www.conrad.nl/goto.php?artikel 6604[/url]



The 11.1 volt is a bit of a disadvantage, with a nominal voltage of 3,7 Volts per cell you have to choose between 11,1 volts or 14,8 volts. (The 14,8 Volt model weights 0,5Kg). Note that this is the nominal voltage, a fully charged battery will have a higher voltage. You will probably have to adapt the rectifier/regulator, but given the significant weight savings, this could be worthwile.



Anyone tried this already?



Frans

Visit -  www.EuropaOwners.org

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

craigb(at)onthenet.com.au
Guest

Posted: Wed Oct 01, 2008 3:51 am Post subject: Lithium Polymer start battery

I had heard they were available but hadnt been able to find any in

australia, I was looking

at the dry charge race car batteries which come in at around 1.5kg 13.5volt

7Ah with about 200CCA

cost is about $250 for them, which looks to be about the same as the LI-PO I

must try harder to find

the LI-PO batteries out here.



craig



--

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

frans(at)paardnatuurlijk.
Guest

Posted: Wed Oct 01, 2008 8:12 am Post subject: Lithium Polymer start battery

craig bastin wrote:

 	  Quote: 	
		   

 

 I had heard they were available but hadnt been able to find any in

 australia, I was looking

 at the dry charge race car batteries which come in at around 1.5kg 13.5volt

 7Ah with about 200CCA

 cost is about $250 for them, which looks to be about the same as the LI-PO I

 must try harder to find

 the LI-PO batteries out here.


	


If it is 13,5 volt, it is not a LI-PO battery. Most likely it is a NiCd

or something quite similar. They are difficult for aircraft use as they

need a constant current charge, rather than a constant voltage charge.



What I'm considering now is to use the 11.1 Volt LI-PO battery solely

for starting the engine, and running the main fuel pump (Rotax 914).

These are happy with this voltage. The rest of the system will run on

the normal voltage as delivered by the alternator, backupped with a

lead-acid battery. As the lead-acid battery is now only intended to be a

backup for the avionics, and the backup fuel pump (914), only in case

the alternator fails, it can be much smaller (thus lighter). This setup

will save considerable weight, and add redundancy as well.



Frans Veldman

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

thomas(at)scherer.com
Guest

Posted: Wed Oct 01, 2008 11:43 am Post subject: Lithium Polymer start battery

it's probably the new LiFePo battery. Has 12.8 Volts and will handle 10 

times the number of cycles of a Lipo.



I have found them only here til now (German dealer): 

http://www.lipopower.de/shop/pages-main/category-149/linano-lifepo-fuer-elektroantrieb.html



<Thomas>

---

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

frans(at)paardnatuurlijk.
Guest

Posted: Wed Oct 01, 2008 2:35 pm Post subject: Lithium Polymer start battery

[quote:44794eac54="Europa81"]



it's probably the new LiFePo battery. Has 12.8 Volts and will handle 10 

times the number of cycles of a Lipo.



-----[/quote:44794eac54]



Thanks for the info! However this battery can not be used for starting the engine. And it is three times as heavy as a normal LiPo. Still much lighter than a normal lead acid battery though.

It could be a good companion for the LiPo battery, use the LiPo for starting, and the LiFePo battery for the rest. With less than 1,5 Kg (3 pounds) you have 15 Ah, and additional redundancy.



Frans

Visit -  www.EuropaOwners.org

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum