What do you mean "excellent battery", m8? Because, from ALL the roms I tested so far (including Jaguar & MccM MixTheme V1.3), are terrible in battery. In WinMo ("Energy Sense 6.5") my phone is up for 2.5 days. With all these SD Android roms, couldn't stay "alive" more than 18 hrs WITHOUT much of "playing" with the rom/phone.
Is this V4 THAT good as you're saying?
very hardly you'll get more than 24h usage on android and hd2. you can download current widget from playstore and see if your mA is higher than 4-8 after being in deep sleep, as it should be.
about "speed", i always set sd speed increase (free in playstore) to 2048 to gain some little boost