It’s a 1500mAh battery, so most phones will charge about half-way from flat. I’m being honest – it’s an emergency charger that you can use when you’re on 1% and you quickly need a boost. The cards measure in at 92mm x 60.3mm and will fit in most wallets quite nicely. I tell you, I really liked this. It’s well designed and you can pop the cables out easily (but not too easily).