Which Battery Pack Has More Capacity as a Power Bank?

[easysurfer]

Just started running a test with the colored one . Should have comparable results in about 2 hrs.

Gonna run alone then cascaded two testers in the next run.

[NW-Bound]

Quote:

Originally Posted by easysurfer Got some numbers back. Nice having the dummy load. According to this tester, the Ryobi battery I'm testing, spec of 45Wh now only has 18.531 Wh. Good to know .

How old is your Ryobi battery? I suspect that it is fairly aged, and has lost much of its original capacity.

Do new batteries test up to their capacity? Yes.

I have tested literally hundreds of cells that I bought on the surplus market. Depending on how long they have been in use, or perhaps just liquidated because of a design change, they may test anywhere from 90% to 100%.

Not all Chinese cell makers lie. Often it is the vendor who lies, not the manufacturer.

Now, the aging rate of the cells is a different story. Some age faster than others, and this is something you only know after owning and using them.

[easysurfer]

Quote:

Originally Posted by NW-Bound How old is your Ryobi battery? I suspect that it is fairly aged, and has lost much of its original capacity. Do new batteries test up to their capacity? Yes. I have tested literally hundreds of cells that I bought on the surplus market. Depending on how long they have been in use, or perhaps just liquidated because of a design change, they may test anywhere from 90% to 100%. Not all Chinese cell makers lie. Often it is the vendor who lies, not the manufacturer. Now, the aging rate of the cells is a different story. Some age faster than others, and this is something you only know after owning and using them.

The Ryobi battery is quite old. I say over 10 years old. In fact, I bought another some time ago because this one seemed to not last as long as when new. The measuring kind of confirms this.

I did notice that the non-color tested did shut off before the battery is totally drained, so that too may be why the Wh result is lower than the specs. The tester shut off, but I have a plain battery tester (especially for the Ryobi) that shows 1 bar of energy left.

I'm curious too see with the color tester how much if any juice if left in the Ryobi batter when that tester shuts off.

[easysurfer]

Got a result to compare. Ran color tester alone. The color tester did drain the battery a little more but the numbers are close.

non-color: 3550 mAh, 18.531 Wh

color: 3654 mAh, 18.035 Wh

As for which one to choose? A personal preference.

Color calculates Wh automatically and probably a bit more precise. Also can turn off display during running.

I think (to my surprise) non-color display easier to read. Larger text.

The numbers I'm most interested in (mAh, Wh) are tiny on color.

Color about 2X as much is cost.

p.s. when the battery charges up, I'll run them both cascaded.

[easysurfer]

Oh, I also like that the non-color shows elapsed time, color does not.

[NW-Bound]

Quote:

Originally Posted by easysurfer The Ryobi battery is quite old. I say over 10 years old...

45Wh down to 18.5Wh, or 41% of original capacity.

If it were a lead-acid or NiCad, would you expect it to work at all at 10 year old?

Yes, lithium cells last a long time, but not forever. They usually age fairly gracefully too, but a few go "kaput" suddenly.

[easysurfer]

Here's the numbers running both the color and non-color tester at the same time.

I've decided to keep the cheap one and return the color and the unopened Klein.

I prefer the very simplicity and display of the cheap one (despite having to calculate the Wh).

[easysurfer]

Thought I'd revive this thread as today I saw a USB tester on Amazon which might be exactly what I want. I just had to buy . Looks simple to operate and automatically calculates the Wh.

I could just as well use the one I have at the moment and calculate the Wh on my own. But the lazy in me thinks would be nice to not even have to use that brain cell.

Looks like the tester has to make the trip from China so may take a few weeks to arrive.

In the meantime, here is a picture.

[ERD50]

Quote:

Originally Posted by easysurfer Thought I'd revive this thread as today I saw a USB tester on Amazon which might be exactly what I want. I just had to buy . Looks simple to operate and automatically calculates the Wh. I could just as well use the one I have at the moment and calculate the Wh on my own. But the lazy in me thinks would be nice to not even have to use that brain cell. Looks like the tester has to make the trip from China so may take a few weeks to arrive. In the meantime, here is a picture.

Got a link the the device?


-ERD50

[easysurfer]

My Uonlytech (brand name) USB Tester arrived today.

It works .

The button serves several functions like zeroing different measurements one a a time depending on how many rapid clicks.

It does function the way I want. Captures measurements when measured battery bank runs out of juice and long press on button resets all measurements.