Laptop Battery

The battery in my Li-ion DELL Inspiron 6000 battery is dying on me after just 14 months. It now gives me just about 20 minutes. I confess that I’m a heavy user. I don’t mind replacing the battery a little too soon. Here’s my problem:

The original DELL laptop battery (D5318) that came with my laptop has a 14.8v, 4400mAh rating. The ones available in the market are varied – combinations of 11.1v, 14.8v, 4400mAh, and 4800mAh. I want to know below questions:

1. Is it ok for me to replace my original 14.8v battery with a 11.1v battery? How would it affect my laptop?

2. Is it true that a battery with 4800mAh rating would give me more operational time than one with 4400mAh rating?

3. I know that a Li-ion battery does not suffer from the memory effect. Still, how long should I charge the new replacement battery for the first time (during the 3 repetitive conditioning cycles of charge and discharge) to ensure it’s longevity in the long run? I don’t wanna overcharge the battery but I’ve noticed even Li-ion battery manufacturer/distributor Web sites advising 4, 6, 8, 10 or 12 hours (funny how it’s always a even number).

4. During these first 3 cycles of conditioning, should I let the battery discharge fully until the laptop hibernates/shuts down or should I recharge as soon as I first see the battery low indication?

Above four question is my best concern problem for my DELL  Laptop battery,and I will ask DELL service center to know it.