Bosch (Blue) 18V to Bosch (Blue) 14.4V (Ni-Cd / Ni-MH) Battery Adapter
$56.00
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Bosch (Blue) 18V to Bosch (Blue) 14.4V (Ni-Cd / Ni-MH) Battery Adapter
$56.00
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Use your Bosch 18V GBA (Blue) batteries on Bosch 14.4V GBA (Blue) cordless tools, without buying into a second battery platform. Your Bosch 18V GBA (Blue) battery is 18V and a Bosch 14.4V GBA (Blue) tool expects 14.4V. The converter holds the output at the tool’s level for as long as the battery lasts. Constructed from durable molded ABS with pure copper contacts, for a secure fit and dependable current transfer. It removes the need to keep separate batteries for different platforms, which saves money and simplifies the workflow.
Specifications
- SKU
- PTA-BOSB18-BOSB14
- Fits this battery
- Bosch 18V GBA (Blue) (Lithium-Ion)
- Battery voltage
- 18V
- Runs these tools
- Bosch 14.4V GBA (Blue) (Nickel-Cadmium / Nickel-Metal Hydride)
- Tool voltage
- 14.4V
- Housing
- ABS (Injected)
- DC-DC converter
- Yes — 18V to 14.4V
- Terminals
- Copper
- Current rating
- 40A continuous (80A peak at 18VDC for up to 2 seconds)576 Watt continuous at 14.4V nominal
- Weight
- 128 g (4.5 oz / 0.28 lb)
- Colour
- Black
- Operating humidity
- 5–95% RH
- Operating temperature
- -10 °C to 50 °C (14 °F to 122 °F)
- USB port
- No
- What's in the box
- Battery Adapter
- Warranty
- 12 months after the date of deliveryMore details
- Revision
- Revision 01 (released on August 17, 2026)
Why choose this adapter
- Injection-moulded ABS, not 3D printed — no layer lines to split under load.
- Solid copper terminals, so less of the current is lost as heat.
- Rated for 40A continuous with 80A peak at 18VDC for up to 2 seconds, so a high-draw tool is not held back by the adapter.
- Covered by a 12-month warranty from the day it arrives.
Bosch 18V GBA (Blue) and Bosch 14.4V GBA (Blue) compatibility
It works in one direction only: Bosch batteries powering Bosch tools. For the opposite pairing, see adapters that run on Bosch 14.4V GBA (Blue) batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Bosch 18V GBA (Blue) platform and that your tool takes Bosch 14.4V GBA (Blue) batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Bosch or Bosch batteries and must never be connected to a charger of any kind. Always take the battery out of the adapter before charging, and charge it on the original charger made for your Bosch 18V GBA (Blue) battery.
How it works
-
1. Use the battery you own
Any compatible Bosch 18V GBA (Blue) battery you already have.
-
2. Slide on the adapter
It goes where the original Bosch 14.4V GBA (Blue) battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
Bosch 18V GBA (Blue) to Bosch 14.4V GBA (Blue) — Common Questions
Will this fit my other Bosch batteries?
Only Bosch 18V GBA (Blue) batteries. Bosch also sells Bosch 12V, Bosch 14.4V GBA (Blue), Bosch 18V PBA (Green), and those use a different socket — same brand, different rail and contacts, so they need their own adapter. Compare the rail on your battery with the photos before ordering.
Will my Bosch 14.4V GBA (Blue) tool run as long on a Bosch 18V GBA (Blue) battery?
Runtime comes from the battery, not the adapter — a 5.0Ah Bosch 18V GBA (Blue) battery lasts roughly twice as long as a 2.5Ah one, exactly as it would on its own tool. The adapter’s copper terminals and heavy-gauge wiring are there to keep resistive loss low.
Could this damage my Bosch 18V GBA (Blue) battery or my Bosch 14.4V GBA (Blue) tool?
Used with undamaged, compatible equipment it is not expected to. Bosch 18V GBA (Blue) batteries are lithium-ion with a protection circuit built into the battery, and it keeps working through the adapter — it stays in the battery and never moves into the adapter. Stop when the tool slows noticeably rather than running the battery flat, and stop using the adapter if it becomes unusually hot or the contacts look damaged.
Can I charge through the adapter?
No, and it should never be attempted. The adapter carries power one way only, out to the Bosch 14.4V GBA (Blue) tool — there is no charging circuit inside it. Connecting it to a charger puts the battery, the charger and the adapter at risk. Always take the Bosch 18V GBA (Blue) battery off the adapter and charge it on its own charger.
Does it work with third-party Bosch batteries?
Usually. What matters is the socket, not the badge: if the battery slides on and locks the way an original does, the adapter takes it and the Bosch 14.4V GBA (Blue) tool runs. Aftermarket moulding does vary, so if yours looks unusual send us a photo and we will check before you order.
How much does it add to the Bosch 14.4V GBA (Blue) tool?
128 g (4.5 oz) and a short extension between battery and tool. You notice it overhead or in a tight cabinet; on a drill or driver held normally it disappears.