Reduced FPS on 3rd party batteries?

[Daviebroon]

Hi all,

I've been getting around 6.5fps on my 5D3 with Canon batteries (high speed continuous).

Recently however; I purchased some 3rd party batteries, and since struggle to get close to 5fps. It only seems to have a negative effect with high speed continuous, as silent modes/slow continuous etc all identical.

OEM Canon = 7.2V, 1800mAh
3rd party DSTE = 7.4V, 2600mAh

Anyone know the reason why this may be?

Thanks in advance
David

 

[gcogger]

Many things can affect the FPS, so unless you can guarantee the exact same lighting conditions, subject, and subject movements etc. you can't be sure the batteries are the problem. To be honest, I can't think how they could have such an effect.

 

[Daviebroon]

To ensure the test was comparable, I tested it with lens cap on, manual focus to infinity, manual mode fixed to 1/4000sec and f/4 for all.

Also completed the exact same test with another forum members 5D3, different lens, same settings- and it repeated itself. The batteries were the only common denominator that slowed it down considerably across different bodies and lenses.

On a side note; we also found that the shutter noise from my 5D to his, was completely different in depth and dB (both new cameras & serial number just 70 units apart). Not quite worked that one out either!

 

[andyred]

Also completed the exact same test with another forum members 5D3, different lens, same settings- and it repeated itself. The batteries were the only common denominator that slowed it down considerably across different bodies and lenses

Well, that's very interesting - if it did it across both bodies with exactly same settings etc...

What firmware are they running - wondering if a tweak in the firmware has been applied...

 

[Daviebroon]

Well, that's very interesting - if it did it across both bodies with exactly same settings etc...

What firmware are they running - wondering if a tweak in the firmware has been applied...

Exactly the same firmware - everything points to the batteries, we just don't understand why really. The mAh is higher on the 3rd parties, which usually means the current can be drawn for longer - but overall must be down on how MUCH can be drawn? That's the only conclusion I can come to!