MK 12 volt battery question

[Jeffrafa]

Originally Posted by nparikh

Don't know if anyone has noticed this, but the new batteries seem a bit heavier as well. We pulled out the scale today and clocked them at about 13.5lbs, which is about 1.5 lbs more than the old batteries (someone correct me if I'm wrong that the old ones weighed 12lbs)

Based on the spec sheets linked by Richard, the new batteries are only about .4 lbs heavier

The old exides list approx 13.44 lbs while the new MKs list 13.82 lbs

I'm more concerned about the max current draw - like Karthik said, if the draw is that much different than it will definitely have an impact on robot performance and capabilities

[RoboDriver]

Originally Posted by nparikh

Don't know if anyone has noticed this, but the new batteries seem a bit heavier as well. We pulled out the scale today and clocked them at about 13.5lbs, which is about 1.5 lbs more than the old batteries (someone correct me if I'm wrong that the old ones weighed 12lbs)

You are right but it does not matter because it dose not factor into the weight of the robot.

[bWard]

this is the right battery right?

http://store.aiconsol.com/es17-12-mk-battery.html

[Tottanka]

As an Israeli team we dont have a local seller of hose batteries..
What are we supposed to doif we want more of them?

[Billfred]

Originally Posted by Tottanka

As an Israeli team we dont have a local seller of hose batteries..
What are we supposed to doif we want more of them?

I'd explore <R25>:

<R25> Teams participating in the 2007 FIRST Robotics Competition that are located outside North America may not be able to acquire the exact part (as identified by specific part numbers) or materials of the specified dimensions as defined in these rules. In such situations, international teams must submit a request for approval of nearest-equivalent parts (e.g. nearest metric equivalent, etc.) to FIRST Headquarters. FIRST will determine suitability of the part. If approved, a confirming e-mail will be sent to the team. The team must bring a copy of the e-mail to any competition event to verify that the use of an alternate part has been approved.

[ebarker]

I think these people will ship to Israel.

http://www.economybatteries.com

http://www.economybatteries.com/qsea...eld.y=0&bhcp=1

Order the ES17-12, not the ES17-12AP

Ed

[pludodog]

Originally Posted by ebarker

I think these people will ship to Israel.

http://www.economybatteries.com

http://www.economybatteries.com/qsea...eld.y=0&bhcp=1

Order the ES17-12, not the ES17-12AP

Ed

That's a really good price. I've been between $40 and $50 from most other battery sites.

[Mike Hendricks]

From MK's website ..

http://www.mkbattery.com/images/ES17-12.pdf

Looks like the 720A discharge wins.

[Al Skierkiewicz]

Thanks Bud for overlaying the graphs. It shows pretty conclusively that the differences between the batteries lies mostly in the method used to test. Let's not get hung up on the max current spec. The real difference between the batteries is the internal resistance, 11mohm for the old battery and 10mohm for the new. Hang a dead short on the output terminals (please don't do this) and Ohm's Law tells you...12/.011 vs. 12/.010=1099 vs. 1200. Throw in some safety margin so you don't cause the battery to explode and you get down to the 720 amps max discharge for a new, fully charged battery, no matter the manufacturer.

[AJ R]

<R53> The only legal main source of electrical energy on the ROBOT during the competition is the
12VDC non-spillable lead acid battery provided in the 2007 Kit Of Parts. That 12V battery is
the MK Battery, ES17-12. Additional batteries may be purchased through a local MK
Battery supplier. Teams may use other equivalent 12V batteries during development,
testing and practice matches. However, during the qualifier and elimination matches, only
the MK Battery, ES17-12 can be used (this means NO pre-2007 batteries can be used
during qualification and elimination matches at any official 2007 FIRST competition).

The batteries from past years can be used, but not in qualifying or elimination rounds.

[jparkteach]

Forgive me if this have been mentioned already but could I make a suggestion for all you veteran teams? Find a rookie team nearby and offer them two of your old Exide batteries. I'm sure they'll all appreciate having the extra batteries for testing and practice. Go to usfirst.org to find the rookie teams nearest you!

[Fred Sayre]

Originally Posted by jparkteach

Forgive me if this have been mentioned already but could I make a suggestion for all you veteran teams? Find a rookie team nearby and offer them two of your old Exide batteries. I'm sure they'll all appreciate having the extra batteries for testing and practice. Go to usfirst.org to find the rookie teams nearest you!

Great idea! This is a cool way for a veteran team to painlessly help rookie teams out.

[Jeremytice]

Here's a PDF that I found on the battery.

http://www.mkbattery.com/images/AGM_S_v1_UK.pdf

[bWard]

is this the right battery



http://store.aiconsol.com/es17-12-mk-battery.html

[Al Skierkiewicz]

Originally Posted by bWard

is this the right battery



http://store.aiconsol.com/es17-12-mk-battery.html

Yes. Be careful where you buy so that you don't have to wait until May to get delivery.