Pocket 6k PRO - External Battery life issues on 12v

Hi !!

I´m doing some tests here and I see something a little strange, want to know if someone maybe has the same problem as me.

Using INTERNAL battery (BM Branded 3500mah), I got aprox. 1:15h of Continuous REC time in following SPECS:
ProRES Proxy HD
internal SD card
Screen at 10% of brightness

AND

Using external NP f970 battery (Batmax 7200mah) (tested Smallrig and tilta plates, same results) connected at 12v I had about 1:30h Continuous REC time.

Tested with more than one battery, brand new and I had a friend of me who tested too - with same battery brands and another one with same results.

I know that p6k pro is more power hungry than p4k, but how we explain having same REC time if one battery has 3500mah (internal) and other has 7200 (NP - external) ??

IMPORTANT:

Using same NP battery in pocket 4k via dummy, I have about 2:30h of continuous rec.
And some time ago when I testes same NP batteries on p4k usinig 12v, I had similar continuous rec times...about 2:30h.

So, is there someone experiencing the same issue??

As I see it seems no sense to use external NP via 12v with p6k PRO for now, as the internal does the same job

Thank you!

one NP-F970 battery provides 7.2V

to generate 12 V at an adapter, the voltage must be transferred upwards,
and there is a leakage line.

therefore the best method is still to use a v-mount battery (14.4V - 18V)
to power a BMPCC with the weipu connector (need 10.6V - 20V).


.

….then back down to 7.2V. There’s too much grey area here because many of the numbers are assumed to be correct. Try this.

Time the BM battery internally and also in the plate , divide. It might be useful to run the test in whisper mode and then repeat at 11 to see if there’s significant difference.

Good Luck

one NP-F970 battery provides 7.2V

to generate 12 V at an adapter, the voltage must be transferred upwards,
and there is a leakage line.

therefore the best method is still to use a v-mount battery (14.4V - 18V)
to power a BMPCC with the weipu connector (need 10.6V - 20V).


.

I know...but what I feel strange is that some time ago when using p4k via 12v or via dummy at 7.4, there was not a big difference in battery life...both option did about 2:30h... why this difference is so signifficant in p6k pro

and btw for me v-mount is not a good option to use it handheld...because of its size and price too...

….then back down to 7.2V. There’s too much grey area here because many of the numbers are assumed to be correct. Try this.

Time the BM battery internally and also in the plate , divide. It might be useful to run the test in whisper mode and then repeat at 11 to see if there’s significant difference.

Good Luck

sorry I missed something...what you mean with "whisper mode" and "repeat at 11" ?

First, test the same (BM branded) battery internally and externally. Testing one battery internally and a different one externally leaves too many variables when constants are desired.

Test at minimum draw, low brightness, no phantom, no recording.

Test at maximum draw, 100% brightness, phantom, max framerate, etc.,

Good Luck

First, test the same (BM branded) battery internally and externally. Testing one battery internally and a different one externally leaves too many variables when constants are desired.

Test at minimum draw, low brightness, no phantom, no recording.

Test at maximum draw, 100% brightness, phantom, max framerate, etc.,

Good Luck

Good idea!!

Well, I tested now with the internal battery that came with the camra (3500mah) - using it on a smallrig plate plugged at 12v in the camera.
with same Specs, I had 50m25s of continuous rec!!! vs 1h15m if I use it internally in the camera.
that difference is "acceptable" when the plate is converting from 7.4v to 12v.

What I keep not understanding is why another good quality np f970 7.200 mah have only about 1h30 aprox of continuous rec ??

BM batery 3500mah = 50:25m rec
Batmax np970 7200mah = 1h30 rec
thats no sense for me

the only difference in specs between them is BM battery is 7.4v and all the other NP970 I have tested is 7.2v ... maybe here we have the cause?

thank you!

The numbers stack up quickly against the external solution but this isn't the full story. The battery plate increases the demand on the cell forcing shutdown sooner. If there was actually 33% conversion loss then the battery plate would necessarily be smoking hot. Likely batteries that died on the plate will still power the camera internally. I'd only expect this disparity to increase as the power demands of the camera, 100% brightness, HFR, phantom, etc., rise.

Good Luck

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