Dicaeum melanozanthum
Habitat
Temperate forest and subtropical or tropical moist montane forest
Range
Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, Thailand and Vietnam
The yellow-bellied flowerpecker, Pachyglossa melanozantha, is a flowerpecker described by Edward Blyth in 1843 and formerly placed in Dicaeum. It lives in temperate and moist montane forest in Bangladesh, Bhutan, China, India, Laos, Myanmar, Nepal, Thailand and Vietnam, and the source links it to the Eastern Himalaya (Wikipedia, general species account).
The source gives no size, appearance, diet, behaviour or breeding detail (Wikipedia, general species account).