In addition to Steps 1 to 9 for switching out the battery, there is a Step 0, which is read all 200-plus comments posted since 2012. Some might be applicable to you, depending on the particular iPhone 4s you have.
Reassembling is NOT exactly the reverse order of disassembling because you need to snap the battery connector into place before putting the new battery into the case.
Also, the black-gold pressure contact thingy was tricky to put back into place, under the battery connector.
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
Aucun point de réputation obtenu pour l'instant.