Bosch (Blue) Battery Adapters
Our Bosch battery adapters give you the freedom to expand your cordless tool system without buying new batteries. Use Bosch batteries to power other brand tools or adapt Bosch tools to different battery platforms. Each adapter is designed for safety, efficiency, and long-lasting durability.
Pick a tool to run from your Bosch 18V GBA (Blue) battery
Bosch 18V GBA (Blue) questions
Why do some batteries say 18V and others 20V?
They are the same class of battery, measured at two different moments. Five lithium cells in series read about 20V fresh off the charger with nothing drawing from them, and settle to about 18V once a tool is running. A brand that prints 20V is quoting the first figure and one that prints 18V is quoting the second. That is why an adapter between an "18V" platform and a "20V" platform works: there is no conversion to do.
Will this fit my other Bosch batteries?
Only Bosch 18V GBA (Blue) batteries. Bosch also sells Bosch 12V, Bosch 18V PBA (Green), and those use a different socket — same brand, different rail and terminals, so they need their own adapter. Compare the sliding rail on your battery against the photos before ordering.
How do I find the right adapter on this page?
Use the selector at the top: pick the platform on the other side of the pair and it takes you straight to the one adapter that joins them. Every combination in that list is one we actually make, so if it is there, it exists.
Can I go the other way round — run Bosch 18V GBA (Blue) tools from another brand’s battery?
Yes. Use the swap button next to the selector above and the page turns the search around, from Bosch 18V GBA (Blue) tools back to the batteries that can run them.
Can I charge a Bosch 18V GBA (Blue) battery through the adapter?
No. The adapter carries current from the battery to the tool and does nothing else — there is no charging circuit inside it. Keep charging Bosch 18V GBA (Blue) batteries on their usual Bosch charger.
Will an adapter damage my Bosch 18V GBA (Blue) battery or my tool?
Used with undamaged, compatible equipment it is not expected to. Bosch 18V GBA (Blue) batteries are lithium-ion with their own protection circuit built into the battery, and it keeps doing its job through the adapter. Stop when the tool noticeably slows rather than running the battery flat, and stop using the adapter if it becomes unusually hot or the contacts look damaged.
Does it work with third-party Bosch batteries?
Usually. What matters is the socket, not the badge: if the battery slides onto a Bosch 18V GBA (Blue) tool and locks the way an original does, the adapter will take it. Aftermarket batteries do vary in moulding, so if yours looks unusual send us a photo and we will check before you order.