Can I use the battery immediately after unpacking the shipping box?

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No, first you must fully charge the battery - the first initialization charging.

All goods we supply is new direct from the manufacturer.
The batteries are charged conservation.
To be able to use it must first be charged with a low current.
The first charge should not exceed 0.5 C - that for your cells LFP040Ah is 20A.

Please check and follow the information here:

http://gwl-power.tumblr.com/post/556594132/faq-3-2v-lfp-cell-initial-charging

http://gwl-power.tumblr.com/post/576978080/faq-initial-charging-information-the-above-is

http://gwl-power.tumblr.com/post/46595246130/question-i-want-to-make-the-initial-charge-of-all

For easy implement the first initialization charge, we recommend connect all delivered cells to parallel and charge them as one big cell.

Please note that the charger outputs should be connected to both ends of the parallel rows of cells, exactly as it is described here:
http://gwl-power.tumblr.com/post/3297893710/the-charging-12-pcs-of-20ah-cells-the-initial


Example of initial charging 12V block batteries - LP12V60AH+ paralel:
http://gwl-power.tumblr.com/post/3297602805/charging-12v-batteries-in-a-parallel-pack-six-12v

PLEASE CHARGE THE BATTERY BEFORE THE FIRST USE!!