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CTR350 EVDO Router runs for 3.5hrs on 4xAA batteries

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3Gstore
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Joined: 19 Sep 2006
Posts: 3158

PostPosted: Sun Oct 07, 2007 5:42 pm    Post subject: CTR350 EVDO Router runs for 3.5hrs on 4xAA batteries Reply with quote

Here is a picture of my CTR350 hooked up to 4 AA batteries in a holder you could get from RadioShack.



The batteries are rechargeable Energizer NiMH 2500mah but are really old. I cycled/refreshed them in my expensive R/C car charger, and the batteries operated my CTR350 for 3.5 HOURS. I've been watching football and have my web browser connected to two different Fantasy Football flash apps that keep the connection constantly in use.

If you're curious about speeds through router while battery powered... so was I. The following speedtests show there was no difference from tests I did earlier in week on a/c power:




Knowing that CradlePoint has said it should run fine on 6volts, I plan on testing my CTR350 with 5 AA batteries in a modified 6-cell holder to see what that does. Runtime should only get better!

There are quite a few high end Li-On rechargeable packs that put out 5v intended for use with iPods and handheld games like the Nintendo DS. Some of those high end units would last MUCH longer than my test with 4xAA NiMH batteries, but also cost upwards of $60.

Maha now makes 2700mah AA batteries, and I could get 16 of them for the same $60 as a single high-end Li-On pack, and rotate out different 4xAA packs as needed. Besides, it only takes the CTR350 20-30 seconds to establish a connection!

Based on this initial testing, I'd say that the CTR350 is going to be very popular for those folks who need a truly portable EVDO router solution!


Last edited by 3Gstore on Tue Oct 13, 2009 8:30 am; edited 2 times in total
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jackrodgers
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Joined: 23 Mar 2006
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PostPosted: Mon Oct 08, 2007 2:38 am    Post subject: Reply with quote

I was wondering when someone would try battery power...

There are newer rechargeables that are 2500 ma (?) vs the older 1800 ones. These cost about $20 or so for 4 including the charger.

I am using the rechargeables in my Mighty Mouse and Wireless Keyboard by Apple. They too are several years old and I had to dust them off since I hadn't used them in two or three years.

UPC makes a $100 or so battery pack that is rated for 8 hours of computer use and so I'd guess it would run the Cradlepoint for one to three days.
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jackrodgers
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PostPosted: Mon Oct 08, 2007 2:43 am    Post subject: Reply with quote

Question:

It appears that your upload speed was cut in half, but these tests can be inconsistent. This is a problem leading to the attempt in one thread to write new firmware for Sprint's Linksys unit and was supposedly resolved in another thread by clicking a checkbox.

Can you run more tests to see if this 50% reduction in upload speed is repeatable?

The Sprint test site takes less time to activate than some of the others and does a longer test on the upload. Note that the 3 Sprint sites can produce remarkably different results if done sequentially, something that just a part of the testing methods.
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3Gstore
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PostPosted: Mon Oct 08, 2007 6:03 am    Post subject: Reply with quote

jackrodgers wrote:

It appears that your upload speed was cut in half

Jack, there is nothing that indicates any speeds are cut in any way.
You are looking at test results I performed on two DIFFERENT sites.
The results are both on battery power, not before and after.
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orbitalcomp
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Joined: 28 Apr 2007
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Location: Texas

PostPosted: Mon Oct 08, 2007 6:56 am    Post subject: Reply with quote

Nice solution, Alex. Seems like this thing is very power-efficient if it can run that long on some AA cells. My KR-1 can run for about 4-6 hours on my Socket pack, so this Cradlepoint could probably double that run time.

You mentioned the other day that the CP uses a larger barrel connector than the KR1...I wonder how the size compares to a PSP charger? There's gotta be a USB cable out there somewhere that will work...

I should just stop looking at these threads, otherwise I am going to want to order the CP/U727 combo Wink
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tbhausen
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Joined: 12 Dec 2006
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PostPosted: Mon Oct 08, 2007 7:59 am    Post subject: Reply with quote

Alex, I've been out of town this weekend so you beat me to it Wink

Wow, since the AC adapter is rated at 2.5A I only expected up to 1.5hrs on 2500mAh cells. 3.5hrs? Nice!

Is that an Adaptaplug "N"?

Thanks,
Todd/Indy
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3Gstore
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PostPosted: Mon Oct 08, 2007 8:07 am    Post subject: Reply with quote

tbhausen wrote:
since the AC adapter is rated at 2.5A I only expected up to 1.5hrs on 2500mAh cells. 3.5hrs? Nice!
Is that an Adaptaplug "N"?


my guess is, the adapter provides more than is needed.

its entirely posssible that because i have good/great signal at home, i was consuming less power than others might. makes sense to me.

no, it would be adaptaplug L according to radioshack.

but i'm not using radioshack adaptaplug solution because it was too pricey for my taste. $10 for a plug with pigtail? come on!

instead, i dug around and found a plug off an unused x10 adapter i had laying around.

fyi, while the exact size needed is 2.5 inside diameter by 5.0mm outside diameter.... i've found that the more common 2.5 x 5.5 also works fine.
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xenophon
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PostPosted: Mon Oct 08, 2007 8:25 am    Post subject: Reply with quote

tbhausen wrote:

Wow, since the AC adapter is rated at 2.5A I only expected up to 1.5hrs on 2500mAh cells. 3.5hrs? Nice!



2.5A would be the max, not average. The EVDO card would not draw as much current on downloads, more on uploads. But it is impressive that 4 AAs are essentially feeding two radios.. EVDO and WiFi for 3.5 hours.

Would love to see a splice into the supply with a current/volt meter and test power for different usage patterns. Not just CTR, but USB adapters as well.
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gmcnutt
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Joined: 08 Oct 2007
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PostPosted: Mon Oct 08, 2007 8:50 am    Post subject: Reply with quote

Be careful with 5 batteries. Although the CTR might be fine at 6V, the modem might not, and if it is just a straight shot from the power to the USB connector...
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jackrodgers
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PostPosted: Mon Oct 08, 2007 9:11 am    Post subject: Reply with quote

Alex wrote:
jackrodgers wrote:

It appears that your upload speed was cut in half

Jack, there is nothing that indicates any speeds are cut in any way.
You are looking at test results I performed on two DIFFERENT sites.
The results are both on battery power, not before and after.


Rereading your post I see that you did not do a before and after as I would expect but instead did two afters with two sites.

The scientific method would be:

Before A
After A

Before B
After B

But then how scientific am I?
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3Gstore
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PostPosted: Mon Oct 08, 2007 9:19 am    Post subject: Reply with quote

jackrodgers wrote:
The download speed is 714 in the top graphic and assuming the red numbers are download 380 in the second, thus my statement that your upload speed was cut in half.


i understand your logic, but i'm saying that BOTH tests were done on battery power.
the difference in speeds is because they were done from two different sites.

as often as you've done speedtests, you know its not uncommon for two different sites to give different results.
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3Gstore
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PostPosted: Mon Oct 08, 2007 9:32 am    Post subject: Reply with quote

jackrodgers wrote:
Rereading your post I see that you did not do a before and after as I would expect but instead did two afters with two sites.


my original post said:
"there was no difference from tests I did earlier in week on a/c power"

i was referring to speedtest i did when i was writing review:
http://www.evdoinfo.com/content/view/2124/63/

in that review, is this speedtest done on A/C power on 10/03:


the speedtest i did yesterday on battery power from same site, is HIGHER than test on A/C power, which is why i concluded that battery power is NOT affecting router throughput.

is that 'scientific enough' for ya? Wink
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tbhausen
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PostPosted: Mon Oct 08, 2007 9:33 am    Post subject: Reply with quote

I put a digital calipers to my CTR adapter amd measured the OD at 5.5mm so I'll need to re-check that.

FYI here's the defiinitive Adaptaplug size chart:

http://support.radioshack.com/support_tutorials/batteries/pwrgde-2H.htm

Yes, RS does rape us big $ for these adapters.

Todd/Indy
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3Gstore
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PostPosted: Mon Oct 08, 2007 9:41 am    Post subject: Reply with quote

tbhausen wrote:
I put a digital calipers to my CTR adapter amd measured the OD at 5.5mm so I'll need to re-check that.

when i went to RS on saturday, the "L" fit nicely, and thats why I said it was 5.0mm O.D.

i went to my favorite electronics store here in north dallas, and found that a 5.5mm O.D. also fit, but it sure felt tighter than stock plug.

am sure both 5.0 and 5.5 will work.
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Bottar
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Joined: 04 Oct 2007
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PostPosted: Mon Oct 08, 2007 12:39 pm    Post subject: Reply with quote

That battery adapter is great. I might have to build one.
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