Wow, this was a lot harder than I expected, but the guide was spot on and I was able to install a new iFixit replacement battery into my wife's 4s.
You may have installed a bad battery. Did you buy the iFixit battery or did you get a cheap one off eBay or Amazon? I've bought those before and the results have always been mixed. These batteries lose their charge just being in storage and so it's entirely possible to get a "new OEM" battery that is terrible.
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.