Where possible any bats suitable for release should be released back into the wild as soon as possible to avoid over-wintering. In the UK bats hibernate during the winter period and retaining a bat in captivity in this time could cause other problems such as early pregnancy in females.
Short-term casualties can be considered for release in the hibernation period in winter, as long as they are healthy and of a good weight, and the other conditions for release are met (see Rehab and release section).
Cages should be in shaded natural light, with roosting places where bats can hide away. If this is done most bats will slow down to half or less of their normal activity in winter and some will hibernate completely for several months.
Providing both water and food will allow bats the opportunity to feed and drink if required.