Yes, but the improvement in performance is more related to the Eneloop's ability to deliver high currents with little voltage sag than it is voltage increase. Using 4 alkalines gives 6 nominal volts, but under load, I'm betting it's significantly lower; this is evidenced by slower moving flywheels when trying to shoot your Stryfe rapidly while using alkalines.
Six eneloops provide 7.2 nominal volts, but in reality it's close to 8.2. Under load (firing your Stryfe as quickly as you can), I'm guesstimating the 6 eneloops are providing about 6.0 volts.
So if you used a 6 cell eneloop (or any high quality NiMH AA cell, for that matter) in a stock Stryfe, you will get a significant performance boost. I don't know how long the motors would last, but I think it would be a decent amount of time. I say this because so many people use 2 or 3 Trust/Ultra-fire lithium cells in their Stryfe and get decent life out of their stock motors. I know some use 4 Trust/Ultrafires and get enough motor life to consider the battery setup worth it.
But even if you use higher-current-capable batteries for your stock Styfe, you're losing some of this advantage from the stock wiring and rev switch. It's not significant, but the inefficiency is there. I personally use a 6 cell Eneloop pack in my fully stock Rapidstrike and get a significant boost in performance. Given the complicated nature of the Rapidistrike, it's not worth doing a rewire and installing higher current switches. It's not a perfect comparison, though, because the Rapidstrike has higher performing flywheel motors than the Stryfe.
One of the reasons I'm running MTB Rhino motors is for the hopefully longer motor life. If MTB Rhinos get decent life from an 8 cell NiMH or 3s LiPo set up, I'm pretty sure I'll get an even longer life from a 2s LiPo or 6 cell NiMH set up.
Edited by shandsgator8, 04 January 2016 - 09:12 AM.