"Long-Life" battery for E6320?

Hi everyone,

I'm looking to get a second battery for my E6320, and I noticed there were several options from Dell. The 2 that I'm deciding between are:

1: 58 WHr 6-Cell Long Life Battery with 3-Year Warranty for Dell Latitude E6220/ E6320 Laptops
Link to 58 WHr battery details

2: 60 WHr 6-Cell Lithium-Ion Battery for Dell Latitude E6220/ E6320 Laptops
Link to 60 WHr battery details

The difference in capacity is negligible, so I was wondering what the difference was between the two. Does the 58Whr battery have a longer lifespan in terms of charge-discharge cycles?


Also, a question regarding the modular DVD bay batteries. Is it possible to configure them to be discharged AFTER the main battery has reached a certain % charge? I know on Thinkpads the DVD bay battery always discharges first, and always fully discharges, which greatly reduces the lifespan of these modular bay batteries.

 

I am using a media bay battery on dell E6320. The main battery is used first before the media bay battery. And when charging the dell staggers the charge... first the main up to cerrtain percentage, then the media bay battery and then back to charging the main battery.
And just to be sure I do carry another 6-cell for spare! Basically I never carry a charger with me.