The Bosch KL 1208 works exclusively with the following Bosch 12V NiCd battery flat-pack style batteries:
⚠️ The KL 1208 is not compatible with modern Bosch lithium-ion (Li-ion) batteries. Using it on Li-ion packs can cause fire or damage.
When the needle is near zero or stays at a very low, steady level, the battery is effectively charged. 5. Charging Times