12V MAX LITHIUM-ION 3.0 AH BATTERY THE BOSCH GBA12V30 12 V MAX LITHIUM-ION BATTERY IS THE MOST COMPACT 3.0 AH BATTERY IN ITS CLASS. IT IS THE SAME SIZE AS A 2.0 AH BATTERY BUT WITH UP TO 50 MORE RUNTIME. THE 12V MAX BATTERY IS 100 COMPATIBLE WITH ALL BOSCH 12 V MAX LITHIUM-ION TOOLS.