The following book provides very detailed species accounts of the bats of Southern and Central Africa. I bought it in South Africa last year but it sells online in the US (e.g. Amazon and Walmart) for $75 (and other inflated prices elsewhere); Kindle version available. It is an update of the 2010 version. This 2020 version is +18 months old but I don’t recall seeing it mentioned on mammalwatching.com, hence this short note.
Monadjem A, Taylor PJ, Cotterill F, Schoeman MC (2020 June). Bats of Southern and Central Africa: A biogeographic and taxonomic synthesis, 2nd edition. pp640. Wits University Press. ISBN-10:1776145828.