The Blue-cheeked Flowerpecker is a tiny, short-tailed bird found in forests and plantations.
The male has glossy black upperparts and a red rump, with a red, black-bordered throat patch above whitish underparts. The female has dull gray upperparts and a red rump.
It occurs singly or in pairs in forests, forest edges, and plantations, and gives a high-pitched song.
On Atauro Island, Timor-Leste, in 2003–2004, birds fed in fruiting Ficus trees and flowering Tamarindus trees.
Juveniles resemble females but have a pale bill.
An extinction-risk assessment has not been added yet.