if i were to buy a Dynax 7D... IF!
- Thread starter Del_CtrlnoAlt
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photo_kbc said:DSLR don't go for AA... the battery consumption is SCARY...
NP-400 is only rated to 1500mAh. AAs are now 2500mAh. But the VC-7D can use 2 NP-400 which should give 3000mAh of battery life.
6xAA also gives 9V, 1.6V more than NP-400. I wonder what effect it has. :think: Would it be like the S2 Pro with improved AF and motor drive?
Cheers!
Timber Wolf
Senior Member
Well. NiMH AAs output ard 1.4-1.2 volts liddat. So the voltage should only be slightly higher.
Total power is measured in watt hours (Wh)
derived by multiplying voltage with capacity
so it's VAh= Wh
In the case of the NP400 it's 7.4 x 1500 = 11.1 Wh
For 6AAs it's (1.2 x 6) x 2500 = 18Wh
So if u see, 2 NP400s in the vertical grip whould give 22.2 Wh which gives more power.
Total power is measured in watt hours (Wh)
derived by multiplying voltage with capacity
so it's VAh= Wh
In the case of the NP400 it's 7.4 x 1500 = 11.1 Wh
For 6AAs it's (1.2 x 6) x 2500 = 18Wh
So if u see, 2 NP400s in the vertical grip whould give 22.2 Wh which gives more power.
Timber Wolf said:
Some "swakoo" questions.... Well, the NP400 would probably weigh more? I suppose 4Wh may not be very much? Cos 1 NP400 can buy a few AA N-MH batteries.... I was wondering if we can use rechargeable lithium AAs..... they are more powerful and lighter.... I haven't any experience with these things, any comments are appreciated...
Timber Wolf said:
Wah.. so chim.. :sweat:
So info here..
Specs from KM US..
7D with one NP-400 battery..
Number of recorded images: Approximately 400 frames.
VC-7D with two NP-400 batteries or 6 AAs
Recording: Approx. 800 frames.(2 pcs. NP-400 batteries) (*)
Recording: Approx. 300 frames.(6pcs. 2100mAh Ni-MH batteries)
Timber Wolf
Senior Member
Check thread. 7D is here. MAI TU LIAO
Placed order with John 3:16 Price around 2300-2500
Placed order with John 3:16 Price around 2300-2500
Del_CtrlnoAlt
Senior Member
TME said:
it would cost alot more for lithium rechargables than NiMhs, and with the price tag of the energizer lithium on shelves, i dun think its rechargables.
Magnus Wedberg
New Member
deslim27 said:
Doesn't make sense to me. Probably marketing (wrong) numbers, or why should the MAhs of the R& (AA) batteries be less worth than the Li-Ion??? :dunno:
Timber Wolf
Senior Member
I'm not sure but I think it's due to current drain. The camera is quite a high power instrument so sometimes the NiMH cells fail to function after a certain point. Lithium cells are better suited to high power-drain applications.
Perhaps that's why my friend's 7i kept dying after less than 20 shots.
Perhaps that's why my friend's 7i kept dying after less than 20 shots.
Magnus Wedberg said:
It's got to do with the chemistry of the batteries... Lithium is the 3 element in the periodic table. It is very very light and small. For the same size of battery, u can pack more lithium ions (i.e. the charge carriers), hence the capacity is greater than either Ni-Cd, Ni-MH or alkaline batteries (which are actually zinc-carbon batteries).
deslim27 said:
Haha.... I'm a chemist... yes I think it should be correct... lithium batteries were the holy grail some years back when they first emerged as they had and still have the best power to weight ratio in the market... and the lithium polymer batteries could even have polyforms... i.e. can be moulded to any shape... thing is I dun see any on the market today... probably not possible on a large scale...
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