I'd say it's doable if everything is engineered around it. But useless.
We're not able to use 14.8v *effectively*. By effectively I mean to plug one and run a AEG as long as you would on a 11.1v. From what I gathered on ASM, excluding any failure due to fast cycle, the motor will eat the brushes much faster, which will lead to much more frequent maintenance.
If you absolutely want something above 11.1v, start with bigger 7.4s since buffer tube lipo are usually not enough to run the kind of setup that asks for a 14.8v. Since 7.4 have more space (one less cell) you could get a bigger mAh rating. Running those batteries in series will give you more voltage than needed.
Once you handle this, you can try going above, but I'm willing to bet it won't serve any purpose other than education or brief entertainment.
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