What if the boost tech stores the power in another little battery that's used to boost it to 200 when the two 18650 hit their limit the stored energy in some kind of little battery that can hold a charge gets charged before hand using the 18650s, then releases it later in combination with the 2 18650's to reach the 200w. I'm no expert, but that is the only thing I can think of that might work? Maybe it has a little tiny lipo battery that has just enough power to bump up the two 18650s?
Two 18650's can achieve 200 watts without the need for external capacitors or little batteries etc.. that's been mentioned previously.
Remembering that the boards in regulated mods are voltage regulators, they manage the input / output required and the board is the load (resistance) to the batteries and the atomizer coil is the load (resistance) to the board.
And also that Power in = Power out - efficiency loss
We are limited to the board and components input current limits, if the board is poorly designed in it's ability to regulate the input current then it will burn itself up or blow fuses etc.. when it pulls more current (Amps) than it's capable of handling. And also that batteries have both continuous discharge rate (constant drain) and pulse discharge rate (momentary drain), pulse discharge rating is generally much higher than continuous discharge as most batteries can handle much higher current drain for short periods of time. A concern is generation of heat in the battery so if we're continuously pulling pulse rate discharge in a continuous manner the battery will heat up and potential fail or vent.
So if we never exceed the continuous discharge rate (cdr) of 30Amp batteries we would need the following.
I'll assume 95% efficiency of the board for this example
I'll also assume a 30A current input limit for the SX450 board but it could be higher.
In order to achieve 200 W at the output (atomizer) we would need to consume 210 W from the battery to compensate for the efficiency loss.
Power (P) = Amps (I) * Volts (V) or P=I*V
2 18650's = 8.4 V @ full charge
2 18650's = 7.4 V @ nominal charge
@7.0V
7.0V * 30A = 210W
@7.4
7.4V * 30A = 222W
@ 8.4V
8.4V * 30A = 252W
We can calculate if the board is 95% efficient and designed to limit to 30A and will never pull more than that we would need a minimum of 7V from the batteries or 3.5V for two 18650's in series to achieve 200W at the atomizer.
Now I've not mentioned battery sag in part because it depends on the battery in use, how good it is how many charge cycles it's had etc.. and is not instantaneous but it will play a role in the performance of the mod, and if the board is hard set at 30A input current limit and the batteries in use sags below 7V we would not achieve 200W. But assuming a good set of batteries with a full charge one should expect to be able to achieve 200W in Power mode but would most likely suffer in longevity of battery use at that setting. When using the device in Temp mode we would most likely extend the battery usage since we typically drop power output down drastically once the set temperature is achieved and therefore consuming much less energy.
Many that post on this topic suggest that since the DNA 200 only produces 133W from 2 18650's it's not possible to be done safely, but they fail to realize that's due to the low Input Current limits of the DNA 200 board being at 23A. That board wasn't designed for 2 x 18650's at 8.4V it was designed for a 3s Lipo at 12.6V. With the higher input voltage of 3s Lipo lower input current is capable of achieving their original designed 200W output power. But It's just not able to take advantage of the full output capacity of a 30A cdr 18650. If it were capable of taking higher input current it would not be limited to the 133W.
YiHi will hopefully make it work and change the game up again. I hope so....
