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Discussion in 'Pro/Adv Discussion' started by thestone11, Apr 8, 2015.
Since it is a 4S, wondering will that change the body size of the P3? Interesting......
The P3 is the same size physically. This maximizes profit margin.
I also believe a 4S LiPo is rated at it's nominal voltage which is 14.8v not 15.2v.
Lower capacity (and maybe some slight improvements) reduces cell size allowing them to squeeze in 4 cells.
Yup 4S is 14.8v but oddly enough, I got the voltage from the DJI website.
So... stupid question: Would this mean that the 3S batteries are wholly incompatible, or do you think they'd work, but just with lesser flight time?
FAQ says P2 batteries cant be used with P3
Seems fishy to change the nominal volt/cell rating method between P2 and P3.
Maybe to 'sound or look' better???
but... now 23 minutes... before (p2v) 25 minutes... I don´t know why use 4S then...
So they can sell a bunch of new batteries. Why else/
Lightbridge has extra power consumption.
But can a P3 battery be used in a P2??
Of course not ... different voltages and probably different fit to ensure people don't mix them up.
There is no forward or reverse compatability.
The P2 is 3S (11.1V) the P3 is 4S (14.8v).
According to DJI spec sheet for the phantom 3: it is 15.2V
Yea I know.
I've been using LiPos for about ten years and those numbers are atypical specifications.
Look up any 4S LiPo [nominal] voltage and get back to me.
DJI has decided to spec. it at a different charge level.
This same level would spec. the P2 Batt. an 11.4v, atypical.
Most likely the p3 is heavier and to compensate for the weight/flight-time ratio, a whole new power system is used, one that requires more amps, discharge rating hence 4 cell instead of 3.
It's about the same weight ...
Weight (including battery and propellers)
It just has a lot going on, powering lightbridge etc and needs more juice.
that's a dollar a gram! (almost)
Bargain ... gold is $38/g
But Gold can be melted down and re-used..... forever.... DJI Lipo... not so much
Hmm, one question would be, what would the nominal voltage be on the new LiPo chemistry that has a peak charging voltage of 4.35v/cell instead of 4.2v/cell?
These have been showing up in phones since early 2013 (Oppo Find5 had a 4.35v cell, so does Find7 and Sony Xperia Z3) - these cells might have a 3.8v/cell nominal rating instead of 3.7.
At least some people rate the 4.35v cells with a nominal of 3.8 instead of 3.7 - http://www.highpowertech.com/product_096ffc299200f517.html
That might be another reason DJI broke compatibility, if they switched to a new chemistry, they would have had to stick with incompatibility even at 3S.