How important is the first initial battery charging session on your new cellphone?

Read the user’s manual, and there will be specific instructions for charging your particular unit.

Well I know some manuals do say how long to charge, while some don’t; I just purchased a brand new EVO 4G which had no instructions on the initial charge. I was digging through the book for it. But I figured since if they are all lithium ion batteries, wouldn’t the same concepts apply to all?

In my experience, most advice on battery care suggests a full charge before first time use.

I used my phone immediately.

My phone had short battery life until I totally ran it down zero and recharged. Only had to do it once.

The phone has a built-in Motorola commercial, so I set the video to play in a loop until the battery failed.

After four years it’s still working great. I usually let it drain below 50% before I recharge.
And before anyone

LIB’s have no memory. Use it and charge it all you want.