[OUT OF STOCK] Custom GBZ lipo battery pack

[Dextech]

Ok people, numbers are in. Some look good, some less good and none match ones provided by manufacturer ( shocking ).
I did all test acording to datasheet provided with batteries - 0.2C charge current from empty to 4.2V and current drop to 0.01C, disscharge at 0.2C from standard charge 4.2V to 2.4V.
And results are:

End of charge test

rsz_img_20170204_101523.jpg (35.07 KiB) Viewed 11737 times

Charge: 5383mAh

End of discharge test

rsz_img_20170204_101826.jpg (38.01 KiB) Viewed 11737 times

Discharge: 4877mAh

Timing charging at 1.1A till 80% of average (of both) capacities

rsz_img_20170204_101602.jpg (38.34 KiB) Viewed 11737 times

"Quick" charge till 4120mAh: 4h11min30sec

Still plan on doing few more tests with 1A charge current to match adafruit charger and with smaller diacharge current - I think gbz uses less than 1.1A.
If anyone has info on discharge current for their gbz I would appteciate if you share it with me.

[kite]

Not bad results! So they appear a bit more like 4800mAh battery (picking the lowest discharge number).. that's still not bad! Makes you wonder what cells they actually put in there? Have you opened one up yet? Usually they have written on the cells themselves (seeing as there are 3x in yours) .. for 5700mAh they should be 1900mAh.. perhaps they are 1600mAh?

As for discharge, between 400-600mA (at worst) I get on mine, at worst that's 8hrs and best at 12hrs!

[Mischief]

I'm still in for 2 as those numbers are better than my current battery that fits in the battery bay.

[Dextech]

.. for 5700mAh they should be 1900mAh.. perhaps they are 1600mAh?

Nope, haven't opened one yet but I guess I will have to.

As for discharge, between 400-600mA (at worst) I get on mine, at worst that's 8hrs and best at 12hrs!

Yes I found your stats in one post so I have set new discharge test to 700mA...will see what happens But I think we are good for a days play by all means

[Dextech]

.. for 5700mAh they should be 1900mAh.. perhaps they are 1600mAh?

Nope, haven't opened one yet but I guess I will have to.

I opened one pack and there it was...a bit of a problem. Cells inside didn't match tag on the outside. On pack it says 445256 and on cells is 405456. There is no info on capacity but it has to be less since used cell volume is 5.6% smaller.
Will have to talk with manufacturer about this.

As for discharge, between 400-600mA (at worst) I get on mine, at worst that's 8hrs and best at 12hrs!

Yes I found your stats in one post so I have set new discharge test to 700mA...will see what happens But I think we are good for a days play by all means

I got 7hrs at 700mA. I think we are covered for flight over Atlantic with this baby

[xchristheisx]

Quick update:
Started some tests yesterday and after few hours figured out had some settings left in from previous charging/discharging so had to run things again.
But it ain't all bad, before I went to bed I've put one discharged pack charging and today when I went to work it was still charging after almost 8 hours and number was looking good - 5000+ mAh Will see final number when I get home, then start discharge test and then I also plan to do 80% charge test - to se how long it takes from empty to 80%.

@xchristheisx depends on how high speaker protrudes. If it isn't higher than those bottom AA battery spacers it could work.

Thanks for the response! And thanks for doing all this testing! Count me in for a battery btw.. Im going to make this battery the priority. Not the speaker!

[correia5022]

Wow, great numbers!
I'm following your posts for price tags

[hixair]

I'll be really interested in 3 of these !

Thanks for all the work with the manufacturer !

[clifftopher]

Ill take one depending on the cost....

[Dextech]

I have sent reply to manufacturer today with few photos of measurement results and now I'm waiting to see what they'll say and/or do next.
My guess is that we can expect 5000mAh at best from battery pack of this size. It's not 5700mAh but still way more than other batteries that would fit into battery compartment.
For me this is more than enough but I just have to "bust their chops" for not delivering what they promissed Hope this will help me lower end price of the battery