Double Battery Adapter

Unlock longer runtime and greater efficiency with the Double Battery Adapter, designed to run two matching 18V tool batteries in parallel with your Volt Dropper.

This adapter allows you to connect two batteries at once, extending usable runtime, ideal for camping, 4WDing, worksites, and off-grid power setups.

🔌 Supported Battery Brands

This product is available in brand-specific variants. Please select the correct option for your battery platform :

• Milwaukee
• Makita
• DeWalt
• Ozito / Einhell
• HiKOKI / Hitachi
• Stanley / Craftsman
• Bosch (GBA)
• Bosch (PBA)
• Black & Decker / Porter Cable
• Worx (4-Pin)
  

⚠️ Each adapter is brand-specific and not cross-compatible. Mixing brands will not work and may cause damage.

🔋 Best Use Practice Guide

To get the best performance and longevity from your Double Battery Adapter:

• Use matching batteries
  Always pair batteries of the same brand, voltage, and capacity (e.g. two 18V 5.0Ah Makita packs).
• Check charge levels
  Ensure both batteries are at a similar charge level before connecting (within ~0.2–0.3V).
• Avoid mixing new and old batteries
  Differences in internal resistance can cause uneven discharge and reduced performance.
• Keep connections clean and secure
  Make sure terminals are free from dust, debris, and corrosion.
• Disconnect after use
  Remove batteries when not in use to prevent slow drain or accidental load.
• Monitor temperature
  Batteries should remain cool during operation. Stop use if packs feel unusually hot.
  

When used correctly, the Double Adapter safely extends runtime and shares load across both batteries, improving efficiency and battery health.

Key Features

• Dual Battery Power – Run two 18V batteries in parallel for longer runtime
  
• Brand-Specific Fit – Designed to match your selected battery platform securely
  
• Stable Power Delivery – Reduces strain on individual batteries
  
• Rugged & Reliable – Built for real-world outdoor use
  

Important Notes

• Battery Compatibility – Ensure you select the correct variant for your battery brand
  
• Adapter Only – Batteries, Volt Dropper, and devices not included

Compatible Brands:
Milwaukee • Makita • DeWalt • Ozito / Einhell • HiKOKI / Hitachi • Stanley / Craftsman • Bosch (GBA) • Bosch (PBA) • Black & Decker / Porter Cable • Worx (4-Pin)

Battery Models:
All compatible 18V Li-ion tool batteries for the selected brand variant (e.g. 2.0Ah, 4.0Ah, 5.0Ah, 6.0Ah, 8.0Ah, 9Ah, 12Ah etc)

Battery Type:
18V Lithium-Ion (Li-ion)

Connection Type:
Dual battery parallel connection (requires two matching batteries)

Application:
Designed for use with the Volt Dropper to extend runtime and provide portable, off-grid 12V power

Output:
Dependent on Volt Dropper settings and the connected batteries

Housing:
Rugged ABS plastic with reinforced brand-specific locking slots

Dimensions:
Approx. 95mm (L) × 90mm (W) × 55mm (H)

Weight:
Approx. 150g (without batteries)

Colour:
Black housing (slot design varies by battery brand)

Included in Package:
1 × Double Battery Adapter (brand-specific variant as selected)

Not Included:
Batteries, Volt Dropper, tools, or chargers

Warranty:
12-month manufacturer warranty against defects

Q1: Does this adapter charge my batteries?
No. This is an adapter only. It allows your 18V tool batteries to connect to the Volt Dropper, but it does not charge the batteries.

Q2: Can I mix batteries of different capacities (e.g. 5Ah and 8Ah)?
No, the adapter will function with different capacities. However, best performance and battery health are achieved when using two batteries of the same brand, capacity, and similar charge level. Mixing different battery capacities is highly discouraged to protect the health of your tool batteries.

Q3: Will this work directly with power tools?
It can physically fit, but this adapter is designed exclusively for use with the Volt Dropper, not for powering tools directly.

Q4: Can I use just one battery?
Yes. The adapter will operate with a single 18V battery, though it makes little sense to do this as you may as well connect the single battery directly to the Volt Dropper.

Q5: Is it compatible with third-party batteries?
Yes, most third-party batteries compatible with the selected brand platform will work. For best performance and safety, genuine brand batteries are recommended.

Q6: Is the Volt Dropper included?
No. This product includes the Double Battery Adapter only. Batteries, Volt Dropper, tools, and chargers are sold separately.

Q7: Can I return it if it doesn’t fit?
Yes, however return postage is at the buyer’s expense. Please ensure you select the correct brand-specific variant, as adapters are not cross-compatible between brands.