That seems too long to me. My extended battery was about half charged when I got it and took a couple of hours to reach full charge. I used the phone until the battery drained completely and shut the phone off. It charged completely overnight (not more than 6 hrs). After this charging I got almost 48 hrs out of it with moderate use. You may have some other issues going on.

 

Welcome.

Just about everything you will ever want to know on the subject is in ... http://androidforums.com/motorola-d...ic-battery-life-video-series.html#post3462318.

There are a few real battery hogs on the Bionic that can reduce battery life ...

Mobile Hotspot
Social Location
Any app using GPS

... Thom

 

Yeah i was going to say that you may have a rogue app somewhere causing this. Does your stock battery take longer than what seems normal to charge also? Also have you tried charging it with the phone off to see if that speeds it up. If so then i would definitely start looking at some apps.

 

Possible you might have a lemon. I've never had a warm screen unless I have left it on for hours which i've done once while sleeping >.>. Other than that my screen really never gets that warm. Usually it requires me to run a lot of apps to get it warm. What does your battery stats show?

 

Warm screen indicates that something is hung and is forcing a lot of CPU which will drain battery power.

For me I find that the browser has multiple open windows including one that is updating a lot, or another application is not properly closing.

I would look and see what was running.

 

Glad to see that you were able to get a replacement. Make sure to calibrate your phone. Let it die to 0% and then recharge it all the way to 100%.

 

Actually, be careful about draining it too far. Draining to the point where it warns you to charge is good enough. Draining a Li-ion battery too far can be harmful to the charging circuitry on the battery pack.

See this for some good information about batteries (the whole site is good, actually): Explaining the Do's and Don'ts of Battery Charging - Battery University

(In case you weren't aware, the batteries are Li-ion, so look at the third column.)

 

Generally speaking about LiPo's ( lithium polymer ) like used in our phones, that statement is true but it doesn't apply to the way the Bionic ( and I assume many other phones ) shows the battery charge. When our phones show 0% charge left... they are actually still have @ 3.2v left which is still in the safe zone for a LiPo battery.

So to sum it up ... A LiPo battery rated at 3.7v shouldn't be drained below 3.2v ( our Bionic's show this as 0% ) and shouldn't be charged over 4.2v ( our Bionic's show this as 100% ) ... Draining a LiPo down below the 3.2v or charging them over the 4.2v will shorten the batteries useable life.

Thankfully, Motorola thought it through and made it simple for the average user so they don't have to think about it...

The numbers I gave are for a standard LiPo... I did notice that the standard Motorola battery I've got lists the nominal voltage at 3.8v and not 3.7v... although the extended Motorola battery is labeled as a 3.7v... So I suspect the standard battery has a slightly different chemistry which would explain the minor difference in the listings.