Quick answer
Choose the Medela Pump in Style Battery Pack if you need portable power without a vehicle, and the Freestyle Vehicle Adaptor if you'll be pumping in a car and have a compatible Medela pump.
Why the right power source matters
When you're away from home, a reliable power source can make the difference between a comfortable pumping session and a missed one. Both the battery pack and the vehicle adaptor solve this problem, but they work in very different situations.
The battery pack runs on 8 AA batteries and works with all 9-volt Pump In Style Advanced pumps, giving you about 3 hours of pumping time. The vehicle adaptor plugs into a 12-volt outlet in your car, so it's only useful when you're near a vehicle.
Your choice comes down to where you pump most often and which Medela pump you own.
Compatibility differences you need to know
The battery pack is specifically for Pump In Style Advanced models that use a 9-volt connection. If you have a newer Pump In Style or a different Medela model, it won't fit.
The vehicle adaptor works with Medela Freestyle pumps and also with Pump In Style models purchased before 2008. It also works with the Medela Lactina, but the catalog doesn't specify which Lactina versions. If you have a newer Pump In Style, check your model year before buying.
Because compatibility is narrow for both options, always confirm your pump model before purchasing.
Battery pack vs vehicle adaptor: the trade-offs
- Portability: The battery pack lets you pump anywhere—no outlet or car required. The vehicle adaptor ties you to a 12-volt outlet, so it's not useful for pumping at a park or office. If you need to pump in multiple locations, the battery pack is more flexible.
- Power source reliability: The battery pack depends on 8 AA batteries that you must replace, which adds ongoing cost. The vehicle adaptor uses your car's power, so you don't need to carry batteries, but you must have a compatible vehicle nearby. Consider whether you prefer buying batteries or having access to a car during pumping sessions.
- Compatibility: The battery pack fits all 9-volt Pump In Style Advanced pumps. The vehicle adaptor works with Medela Freestyle and Pump In Style models from before 2008—not newer Pump In Style models. Check your pump's model and year before choosing. Verify your pump model against the compatibility list to avoid a wasted purchase.
Product facts at a glance
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Medela Pump In Style Battery Pack: Runs on 8 AA batteries (not included) and provides approximately 3 hours of pumping time. You can pump anywhere without needing an outlet, but you'll need to keep spare batteries on hand for longer trips.
Medela Pump In Style Battery Pack
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Medela Freestyle Portable Vehicle Adaptor 12 volt: Designed for use in a car or other vehicle with a compatible 12-volt outlet. It keeps your pump powered during commutes or road trips, but it only works when you're in a vehicle.
Medela Freestyle Portable Vehicle Adaptor 12 volt
Which one fits your pumping routine?
Best for
- Moms who pump in multiple places and need power without an outlet
- Owners of any 9-volt Pump In Style Advanced pump who want a portable battery option
Not for
- Moms with a newer Pump In Style model that isn't 9-volt, since the battery pack won't fit
- Moms who only pump in a car and own a Freestyle, where the vehicle adaptor is the better fit
