It should have similar power drain to a regular Vita. I don't know the Vita's battery specs, but that battery can run the system for 3-8+ hours, depending on the model you have, the games you play, and the brightness/sound/wifi settings you use. I would imagine the PSTV uses significantly less power than the PS3 or PS4.
The Winner: Nintendo 3DS. As underrated as the PS Vita’s game library is, the 3DS simply has more amazing titles. The Vita may have more games and a better standard overall than the 3DS, but it doesn’t have Mario, Pokemon, Zelda or any of the amazingly iconic titles that have made the 3DS the juggernaut it is.
10. When you unlock a Trophy it makes the same satisfying 'ting' sound as PS3. 11. Hold your finger on the screen for a couple of seconds and Vita allows you to move icons to different places.
Buying a Vita is definitely a more practical option than spending $99 on the disappointing PlayStation Classic, with its limited functionality and paltry selection of games. The hardware
The general rule for emulation is that the device running the emulator will need to multiple times more powerful (typically around 10 times more). The Vita isn't all that fast. The version of Minecraft it has has been reduced to work on the Vita and still stutters a bit. Many modern cell phones are more powerful than the Vita. To borrow from an

For PlayStation Vita on the PlayStation Vita, a GameFAQs message board topic titled "Why do Vita games look worse than PS3 games?".

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is ps vita more powerful than ps3