High power but low weight batteries?

  • Thread starter Daniel Kelly (AKA Jack)
  • Start date
D

Daniel Kelly (AKA Jack)

Guest
Hi,

Please could you recommend a supplier for high power (but low weight)
batteries? Ideally I need something that can beat these specs:

12V
6Ah
400g

I'm building a wearable system for recording many many hours' worth of
video. I need any voltage upwards of 5v.

Thanks,
Jack
 
Hi Daniel,

Daniel Kelly (AKA Jack) wrote:

Please could you recommend a supplier for high power (but low weight)
batteries? Ideally I need something that can beat these specs:

12V
6Ah
400g
Click to expand...
IMHO Lithium Polymer (LiPoly) accu cells are the way to go.

I have a pack, 3 cell in series (which gives you 10-12V), 1,5Ah
and weighs 100g.

HTH
Wolf

--
From-address is Spam trap
Use: wolfgang (dot) mahringer (at) sbg (dot) at
 
"Daniel Kelly (AKA Jack)" <d.kellyNOSPAM@NOSPAM.ucl.ac.uk> wrote in
message news:c3sn7q$25v2$1@uns-a.ucl.ac.uk...
Hi,

Please could you recommend a supplier for high power (but low weight)
batteries? Ideally I need something that can beat these specs:

12V
6Ah
400g

I'm building a wearable system for recording many many hours' worth of
video. I need any voltage upwards of 5v.
Click to expand...
Eagle Picher? The ones they use in the satellites, probably the best
tho expensive. They have silver in them.

Thanks,
Jack
Click to expand...
 
Great, thanks!



"Wolfgang Mahringer" <yeti201@gmx.at> wrote in message
news:9wx8c.92$062.1544219@news.salzburg-online.at...
Hi Daniel,

Daniel Kelly (AKA Jack) wrote:

Please could you recommend a supplier for high power (but low weight)
batteries? Ideally I need something that can beat these specs:

12V
6Ah
400g

IMHO Lithium Polymer (LiPoly) accu cells are the way to go.

I have a pack, 3 cell in series (which gives you 10-12V), 1,5Ah
and weighs 100g.

HTH
Wolf

--
From-address is Spam trap
Use: wolfgang (dot) mahringer (at) sbg (dot) at
Click to expand...
 
starfire wrote:
You also might want to check Kokam Li-Poly batteries.

The model SLPB526495 is rated at 3.3AHr (3300mAHr) at 3.7V, nominal. As
Wolf points out, three units in series would give you roughly 10 to 12V.
Two sets (of three in series) strapped in parallel gives you a total of
6.6AHr at the required voltage. That's a total of 6 cells. Each cell
weighs about 65.5g for a total of 393g (also within your specifications).

Their website is http://www.kokam.com/english/product/battery_main.html

Good luck.

Dave
Click to expand...
In the WARNING Safety Precautions on their website they make it sound as
if these cells are molotov cocktails just waiting to go off.

"Wolfgang Mahringer" <yeti201@gmx.at> wrote in message
news:9wx8c.92$062.1544219@news.salzburg-online.at...

[snip]
Click to expand...
 
Li-poly is definitely the way to go. I previously purchased several
units from www.worley.com.au, John Grzan. They go up to 42V 200Ah. But
their lightweight ones include the 526495 (5.26*64*95mm) 64gm 3V7 3.2Ah,
so 3 x 2 gives 11.1V at 6.4Ah for 384gm. This sort of size can be picked
up for around $7 in low volume from various Taiwanese companies.

Al

Daniel Kelly (AKA Jack) wrote:

Hi,

Please could you recommend a supplier for high power (but low weight)
batteries? Ideally I need something that can beat these specs:

12V
6Ah
400g

I'm building a wearable system for recording many many hours' worth of
video. I need any voltage upwards of 5v.

Thanks,
Jack
Click to expand...
--
Please remove capitalised letters to reply
My apologies for the inconvenience
Blame it on the morons that spam the net
 
If you look at their construction, you can see they do not include any kind
of rigid protection (like a hard plastic shell). This reduces the size and
weight but does expose the battery to more of a chance of damage. While
Li-Poly batteries aren't near as catastrophic as Lithiums in a severe
dead-short condition, there is still a large charge stored in the battery.
Dead-short conditions are not a good thing. The user should use
"common-sense" in protecting the batteries from external damage.

Kokam is merely stating this up front so all the leech lawyers don't bleed
them dry the first time some idiot tries to jump-start his car with one
cell!

We've used these batteries (very successfully) for several applications with
absolutely no problems. We've found no other sources (to date) that can
exceed their size, weight, and power specifications for the cost.

Dave

"Watson A.Name "Watt Sun - the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:c41it7$6fn4a$1@hades.csu.net...
starfire wrote:
You also might want to check Kokam Li-Poly batteries.

The model SLPB526495 is rated at 3.3AHr (3300mAHr) at 3.7V, nominal. As
Wolf points out, three units in series would give you roughly 10 to 12V.
Two sets (of three in series) strapped in parallel gives you a total of
6.6AHr at the required voltage. That's a total of 6 cells. Each cell
weighs about 65.5g for a total of 393g (also within your
specifications).

Their website is http://www.kokam.com/english/product/battery_main.html

Good luck.

Dave

In the WARNING Safety Precautions on their website they make it sound as
if these cells are molotov cocktails just waiting to go off.

"Wolfgang Mahringer" <yeti201@gmx.at> wrote in message
news:9wx8c.92$062.1544219@news.salzburg-online.at...

[snip]
Click to expand...
 
Thanks everyone for your input!

Jack



"starfire" <starfire151@cableone.net> wrote in message
news:106bicadv7eaf8f@corp.supernews.com...
If you look at their construction, you can see they do not include any
kind
of rigid protection (like a hard plastic shell). This reduces the size
and
weight but does expose the battery to more of a chance of damage. While
Li-Poly batteries aren't near as catastrophic as Lithiums in a severe
dead-short condition, there is still a large charge stored in the battery.
Dead-short conditions are not a good thing. The user should use
"common-sense" in protecting the batteries from external damage.

Kokam is merely stating this up front so all the leech lawyers don't bleed
them dry the first time some idiot tries to jump-start his car with one
cell!

We've used these batteries (very successfully) for several applications
with
absolutely no problems. We've found no other sources (to date) that can
exceed their size, weight, and power specifications for the cost.

Dave

"Watson A.Name "Watt Sun - the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:c41it7$6fn4a$1@hades.csu.net...
starfire wrote:
You also might want to check Kokam Li-Poly batteries.

The model SLPB526495 is rated at 3.3AHr (3300mAHr) at 3.7V, nominal.
As
Wolf points out, three units in series would give you roughly 10 to
12V.
Two sets (of three in series) strapped in parallel gives you a total
of
6.6AHr at the required voltage. That's a total of 6 cells. Each cell
weighs about 65.5g for a total of 393g (also within your
specifications).

Their website is
http://www.kokam.com/english/product/battery_main.html

Good luck.

Dave

In the WARNING Safety Precautions on their website they make it sound as
if these cells are molotov cocktails just waiting to go off.

"Wolfgang Mahringer" <yeti201@gmx.at> wrote in message
news:9wx8c.92$062.1544219@news.salzburg-online.at...

[snip]
Click to expand...
 
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