Do You Really Need the Dual-Battery Dolphin PLUS Folding Electric Bike?
by Crazy K on Aug 13 2025
When you're out shopping for the Dolphin electric folding bike, there's often one big question: Should I go for the single-battery version or splurge on the dual-battery Dolphin Plus? &“What made you decide to buy—or consider buying—the Dolphin Plus?”
--Many owners answer: “It offers all the features I wanted while still keeping the weight under 60 lbs, which means even someone like me, a retired person, can easily lift it into my truck.” These riders place a high value on the balance between performance and weight. Some have compared more than ten folding e-bike models on the market, but in the end, they chose the Qualisports Dolphin Plus for its manageable weight.
Fully equipped with fenders and both batteries, the Dolphin Plus weighs 55.8 lbs. That’s not exactly light, but it’s far from heavy either. However, if you add front and rear rack, or a crate full of soda—the weight can climb past 65 lbs!
Let's first take a look at the differences between STD and PLUS.
Quick Specs
| Feature | Dolphin STD | Dolphin PLUS |
| Battery | 48V 10.5Ah | 48V 17.5Ah |
| Removable Battery | ✅ | ✅ |
| Brake | Hydraulic | Hydraulic |
| Brake Cut-off | ✅ | ✅ |
| Motor | 500W | 500W |
| Gears | Shimano 7-Speed | Shimano 7-Speed |
| Weight | 51.5 lbs | 55.8 lbs |
| Range | 55+ miles | 80+ miles |
Why Riders Choose the Dual-Battery Dolphin Plus
1. Go Farther Without Worrying About Running Out of Juice
The Dolphin Plus can go up to 80+ miles on one charge when you use both batteries. That's great for long commutes, weekend getaways, or just exploring without having to stress about where to charge next. Whether you're cruising on the beach boardwalk or riding in the city bike lanes, that extra battery power gives you more freedom.
2. Surprisingly Light When You Need It
You might think adding another battery would make the bike heavier all the time. But here's the thing: both of the Dolphin Plus batteries can be taken out and used on their own.
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If you want to carry a lighter load, just leave the seatpost battery at home and use only the frame battery.(Yes, you can use a seatpost with the same diameter but without a battery)
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Taking out the seatpost battery cuts off almost 8 lbs, so it's easier to lift the bike into your truck bed, car trunk, or even your RV.
3. A Portable Power Bank on Wheels
The frame battery isn't just for powering the bike. It also has a USB output that can charge your phone, camera, drone, or LED lights. That makes it a great companion for camping trips, photo shoots, or emergencies.
Smart Charging for People on the Go
For RV owners or people who like to take road trips, the Dolphin Plus is awesome. With Qualisports RV charger, you can charge one battery in your vehicle while you're riding with the other. That way, you always have a charged battery ready to go—no waiting around, just more adventures.
Upgrade Options
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Can I Upgrade a Single-Battery Dolphin?
Yeah. You can buy the Dual Battery Kit from Qualisports. It comes with the frame battery and a converter.
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How Does the Bike Switch Between Batteries?
When the frame battery is being used, it powers the bike first. Once it runs out, the system automatically switches to the seatpost battery.
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Is It Safety-Certified?
Definitely. The Dolphin Plus and both of its batteries are UL 2271 & UL 2849 certified for safety and reliability.
- How to turn on the frame battery?
--https://youtu.be/_xMLkWPxPjk?si=eIsnakzzEVvY1pWo
Who Is the Dolphin Plus For?
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Commuters who want to travel farther without having to charge every day.
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Travelers who take their bikes on RV trips, boats, or private planes.
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Seniors and Casual Riders who want a good balance of power, range, and a bike that's easy to handle.
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Adventure Lovers who like to power their gadgets like cameras and lights while they're out riding.
Final Thoughts
If you only ride short distances and want to keep your bike as light as possible, the single-battery Dolphin STD might be all you need. But if you're into longer rides, having a backup power source, and more flexibility, then the Dolphin Plus dual-battery version is worth the money.
Key Takeaway: The Dolphin Plus isn't just a bike that can go farther. It's a folding e-bike that's flexible, ready for travel, and packed with power. It can fit into your lifestyle.
(Note: The seatpost without battery is custom-made and is not currently listed on the Qualisports website.)
(Note: The seatpost without battery is custom-made and is not currently listed on the Qualisports website.)
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