Topic: battery answer for SOME. (Read 1679 times)

August 01, 2014, 11:25:08 AM

This will run your fishfinder all day /// yes the color 5 inch with GPS..

http://www.amazon.com/dp/B005NGLTZQ/ref=cm_sw_r_fa_dpd_tK82tb0FG7PN303C

August 01, 2014, 11:47:41 AM #1

that's an interesting idea - does it give out enough amperage to support a FF though?

Also, how do you do the battery connections? I don't know enough about wiring USB. Is it a normal positive negative terminal if you cut off one side?

August 01, 2014, 11:50:29 AM #2

Oh I see, it comes with a multi-voltage port:

4.3 x 1.6mm to 5.5 x 2.5mm multi-voltage cable

So you'd need a connection that would fit that 2.5mm cable (female?)

August 01, 2014, 11:55:22 AM #3

I can honestly say I had not thought of this but it its an interesting idea. my little 3000 brick doesn't have a multi-voltage port so I can't test this out though. Have you done this Howard?

August 01, 2014, 12:37:38 PM #4

At 20,000mah this pack is 10 times as strong as a 10X AA @ 2000-2200mah and very well priced with a charger! I've seen smaller Lipo batteries go for more than this. Nice find Howard! The 15,000MAH version looks like a great deal too!

August 01, 2014, 12:44:53 PM #5

I have an Anker 10000 mAH, similar to the one posted but an older model.

Warning ... the 20000 rating is NOT accurate. I discussed this with Anker support in detail. While the rating is true at the battery side, the output of the battery goes through voltage regulators in order to supply the various voltages that the device does. In practice, there is a 30% drop in efficiency. So my 10000 mAH model is really 7000 mAH. I see in the description that this one has 10% higher energy efficiency than the last model. So perhaps it only drop 20%. That means this is effectively a 16000 mAH battery. YMMV.

-Allen

August 01, 2014, 01:12:44 PM #6

Well that's too bad to hear! But I guess most battery manufactures are liars about capacity and other ratings. http://www.greenbatteries.com/battery-myths-vs-battery-facts-1/ There was a good site comparing different manufacturer's batteries spec ratings vs. actual ratings, but I cant seem to find it right now. But basically from that list there were only a handful of manufacturers that were close on reported vs actual.

August 01, 2014, 01:32:25 PM #7

I have not done this yet but my friend has been successfully running one for some time now.

August 01, 2014, 04:41:53 PM #8

Quote from: surfingdude on August 01, 2014, 01:32:25 PM

I have not done this yet but my friend has been successfully running one for some time now.

I've done it. Works well. Also gives you a USB port should you need to charge a GoPro in a pinch.

-Allen

August 01, 2014, 04:44:00 PM #9

Quote from: AlsHobieOutback on August 01, 2014, 01:12:44 PM

Well that's too bad to hear! But I guess most battery manufactures are liars about capacity and other ratings. http://www.greenbatteries.com/battery-myths-vs-battery-facts-1/ There was a good site comparing different manufacturer's batteries spec ratings vs. actual ratings, but I cant seem to find it right now. But basically from that list there were only a handful of manufacturers that were close on reported vs actual.

I dug up the communication I had with Anker. Here is what I asked.

Quote

I have the 10000 mAh version. The instruction manual says 10000 mAh at 3.7V. Why is it specified at 3.7V when there is no 3.7V output on this unit. What is the capacity at 12V output? 5V output? 9V output?

And here is their response.

Quote

3.7V is the voltage of the internal cells. The built-in battery cell has a voltage of 3.0-4.2V. The PCB will boost it from 3.0-4.2V to 5V or higher (12V / 9V) to give a USB output to charge you devices. This procedure consumes power, plus the power will also drain on the Resistance of the cable and phone's circuit, those makes the anker external battery have an efficiency of about 70% (most of other external battery products' efficiency in market is lower than 65%). Therefore, the actual output of this external battery is 70% (10000*70%=7000mah). Hope this helps.

-Allen

August 01, 2014, 07:30:51 PM #10

Quote from: polepole on August 01, 2014, 04:44:00 PM

Quote from: AlsHobieOutback on August 01, 2014, 01:12:44 PM
Well that's too bad to hear! But I guess most battery manufactures are liars about capacity and other ratings. http://www.greenbatteries.com/battery-myths-vs-battery-facts-1/ There was a good site comparing different manufacturer's batteries spec ratings vs. actual ratings, but I cant seem to find it right now. But basically from that list there were only a handful of manufacturers that were close on reported vs actual.

I dug up the communication I had with Anker. Here is what I asked.

Quote
I have the 10000 mAh version. The instruction manual says 10000 mAh at 3.7V. Why is it specified at 3.7V when there is no 3.7V output on this unit. What is the capacity at 12V output? 5V output? 9V output?

And here is their response.

Quote
3.7V is the voltage of the internal cells. The built-in battery cell has a voltage of 3.0-4.2V. The PCB will boost it from 3.0-4.2V to 5V or higher (12V / 9V) to give a USB output to charge you devices. This procedure consumes power, plus the power will also drain on the Resistance of the cable and phone's circuit, those makes the anker external battery have an efficiency of about 70% (most of other external battery products' efficiency in market is lower than 65%). Therefore, the actual output of this external battery is 70% (10000*70%=7000mah). Hope this helps.

-Allen

Wow!

August 01, 2014, 10:13:05 PM #11

Assuming the battery truly outputs 20a at 3v, the output at 12v = 5a only. They're nice enough to explain that it only has a 70% efficiency, which drops it down to 3.5a. $80 for a 3.5a/12v battery is definitely not a good deal. I paid $37 for my 5a/12v Lipo from Tanergy. Base on the size of the unit, it seems comparable to a 4-5a Lipo cel. I do not trust any battery manufacturer (domestic or foreign) ratings. I test all the batteries I buy before putting them to use. Most Lithium batteries I've tested have between 70-80% of their rated capacities. I tested one Lipo from Tanergy that has 105% of their rated capacity, but when I bought the same battery from the same source again and it only contains 80% of their rating. Like Allen said, most batteries do not put out what they claim. If it puts out 80%, I'd consider it a good one. The Anker is definitely not a good deal.

August 01, 2014, 11:02:09 PM #12

Quote from: lucky13 on August 01, 2014, 10:13:05 PM

Assuming the battery truly outputs 20a at 3v, the output at 12v = 5a only. They're nice enough to explain that it only has a 70% efficiency, which drops it down to 3.5a. $80 for a 3.5a/12v battery is definitely not a good deal. I paid $37 for my 5a/12v Lipo from Tanergy. Base on the size of the unit, it seems comparable to a 4-5a Lipo cel. I do not trust any battery manufacturer (domestic or foreign) ratings. I test all the batteries I buy before putting them to use. Most Lithium batteries I've tested have between 70-80% of their rated capacities. I tested one Lipo from Tanergy that has 105% of their rated capacity, but when I bought the same battery from the same source again and it only contains 80% of their rating. Like Allen said, most batteries do not put out what they claim. If it puts out 80%, I'd consider it a good one. The Anker is definitely not a good deal.

Yeah, sort of right depending on how you read what they said. I didn't think about this until you brought it up. The stated 70% is likely for the 5V output. As you stated, it likely drops proportionally as you go up to the 12V output level.

-Allen

August 02, 2014, 12:07:20 PM #13

For same output the UPS type sealed lead acid type batteries like this one provide 8 Ah for $19.20 and my UB1280 weighs 4.8 lbs. The UB1280 is a perfect fit for the battery case that Ocean Kayak provides with its Trident Angler kayaks and I can recharge it with anything. Amp rating is equivalent to the $80 battery mentioned in the OP.

http://www.amazon.com/UPG-UB1280-Sealed-Lead-Batteries/dp/B0009GIKNE/ref=sr_1_1?s=electronics&ie=UTF8&qid=1407006007&sr=1-1&keywords=8+ah+sealed+lead+acid+ups&dpPl=1

I have trouble seeing the gain in paying 4x as much to save 4 lbs. of weight with a kayak and below deck space for a battery is hardly at a premium.

If I wanted an above deck mount for a finder with its battery and transducer for overseas air travel and use on a rented kayak then this battery might be a consideration.

August 02, 2014, 04:28:55 PM #14

I am eliminating the 4 pounds with a power source that runs my Lowrance all day the extra $ is worth it in my book ... I will probably run another one for my live well now I am 8 pounds lighter ...

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Topic: battery answer for SOME. (Read 1679 times)

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