[myTouch 4G Accessories] The Swiftman:
^ No problem. I just got back from my local theme park for their haunt event (lots of waiting in line so lots of phone use) and I'm again amazed by the performance of this battery. After 9 hours off the charger (the phone was awake for about 50% of that time and the screen was on about 25% of that time) I'm only at 66% battery. That involved a lot of 4G web browsing by the way.

Here is my current setup:

ROM: DemonSPEED MIUI 1.7.15 (found that this version give me the best battery life)

Kernel: DeamonSPEED Version 2

Apps: Juice Defender Ultimate and SetCPU

Juice Defender Ultimate Settings:

About Page:

Disable on Wifi: Mobile Data

Status Page:

Profile: Advanced

Notification: Graphical (Optional, just like being able to glance at it and know what's going on)

Options: Quick Enable and Quick Disable

Controls Page:

Mobile Data: Enabled

Wifi: Enabled

Options: Auto Disable and WiFi Preferred

3G: Enable if your ROM allows it- mine doesn't

AutoSync: This one is up to you. I have it off but that's because I don't really care about push email or Facebook and all my Twitter notifications go through SMS.

CPU: I have it disabled because I use SetCPU. If you use something else, leave it disabled. JD does an ok job with managing this though. Up to you.

Schedules Page:

Schedule: I have this disabled but if you care about getting notifications for things that require data while your phone is off, you'll want to enable this and AutoSync.

Night: I have this enabled but again, this is sorta up to you. Airplane mode at night does help though if you don't care about getting calls while you're sleeping (screw your friends who broke down at 3am and need a ride home- battery life is more important!) :p

Peak: This just seems pointless to me. Maybe some one has a use for it, but I sure don't.

Weekend: Just like Peak, I don't see the point.

Triggers Page:

Battery: Enabled

Battery Threshold: I have mine at 15%, but it's just a preference thing.

Charger: I have both USB and AC on, but again, just personal preference.

Screen: This is where my settings get a bit radical. I have this disabled because I find that normally when I turn on my phone, it's to answer a text message, not browse the web. If I need the Internet, all I have to do is pull down the notification panel and hit "Enable Connectivity". This setting isn't for everyone, but you'll just have to evaluate how you normally use your device. It can save a TON of battery.

Traffic: Enabled because I hate to be downloading a ROM and have my screen go off and my WiFi shut off.

Apps: I have it disabled, but if you enable it for the things you need Internet for, it can make that screen setting above a whole lot easier to live with. Open the web browser? Juice Defender will turn on 3G for you.

Location: I have it enabled and love it.

If you want updates when you get a new comment on a Facebook post or someone replies to you on Twitter, use their SMS notification services and disable the app's notifications. Having Twitter and Facebook trying to AutoSync all the time is a huge battery drain. SMS notifications don't look great, but they get the job done in the end.

If you want my SetCPU settings I can post them as well.