<p>We consider Einstein gravity minimally coupled to two Maxwell fields and one (real) dilaton scalar. We study the electrically-charged spherically-symmetric and static solutions that are asymptotic to Minkowski spacetime. General solutions are described by four independent parameters: mass <i>M</i>, two electric charges (<i>Q</i>₁, <i>Q</i>₂) and the scalar charge Σ. For black holes, the scalar charge is not independent, but a function of (<i>M</i>, <i>Q</i>₁, <i>Q</i>₂). We provide a set of formulae relating the mass to the charges, which allows us to determine Σ(<i>M</i>, <i>Q</i>₁, <i>Q</i>₂) without having to solve the black hole equations. Our results confirm the weaker version of the no-hair theorem conjecture involving one real scalar: it can be turned on in a black hole, but it does not have a continuous independent hairy parameter.</p>