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Words Alex Stevens
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If you had a chance to read our last issue, you might recall our review of the Mondraker Dune R with Bosch’s lightest drive unit; the Performance Line SX.

We loved the natural ride feel of this bike and thought that, being a lighter set-up but still with plenty of torque and power, it would be ideal for backcountry and hike-a-bike missions, especially with the addition of a battery range extender.

With Bosch’s PowerMore 250 Range Extenders now available in New Zealand, we’ve had a closer look at this system and can confirm we like what we see. Here’s how it works.

About the size of a drink bottle and weighing in at just 1.5kg, this extra battery provides 250Wh of capacity and can increase range by up to 60 per cent. It’s exactly what you need for a big day out when the plan is to push the adventure — but not end up pushing the eBike home. Knowing that you’ve got extra juice in the tank gives you the freedom to explore further without that niggly range anxiety.

The PowerMore 250 is designed to fit neatly in the water bottle holder on the down tube and connects to the charging port via a cable. The cable doesn’t come as part of the package because the cable length varies depending on the size of the bike frame. It may sound like a hassle remembering to order a separate part but better to have a system that actually fits your eBike rather than making do with a one-size-doesn’t-fit-all workaround.

Cable lengths range from 50mm to 750mm and all you have to do is plug it into the PowerMore 250 and into your charging socket on the frame. The PowerMore cable also comes with two different connector variants: cable routing in the direction of the battery holder and cable routing facing away from the battery holder.

You’re probably asking, is 250Wh enough power? Remember, this is designed to boost your range, rather than act as your main battery. Bosch’s vision for the future is that all batteries in the smart system will become DualBattery- capable, meaning they can be combined for longer and/or more demanding riding.

Saying that, though, you can actually use the PowerMore 250 as a single battery — should you need to. We’re not really here for a quick trip to the dairy, though, so let’s get back to the main purpose: big rides.

If you’re riding an eBike with a mid-range drive unit like the Performance Line SX and adding an extra 250Wh on top of the 400Wh from the Bosch CompactTube 400 (which is presumably what Bosch had planned since these products were all released at the same time), you’ll probably find your legs give up before the bike does. The main advantage here is that you’re carrying less weight.

One thing you will need to check before you get too excited about range extenders, is whether the PowerMore 250 is compatible with your eBike. Even if you’re running a Bosch eBike System it will need to come with Bosch’s Smart System from model year 2024. Check if that’s the case via the Bosch Flow App (settings > My eBike > eBike Pass > Components) or eBike display (Settings > My eBike). If ‘PowerMore’ is an option on the menu that means you can retrofit PowerMore 250. Alternatively, your local Bosch eBike dealer will be able to tell you.

Why can’t PowerMore 250 be retrofitted to all eBikes with a Bosch system? As we all know, Bosch are big on safety features. In this case, it’s about making sure the eBike meets special requirements including, for example, reinforced receiver tubes at the attachment points in the frame.

So, there you have it, an answer to the question we all want answered: how to fit more riding into your life. If you’re on a Bosch-powered eBike, check your Flow App to see if it’s compatible with the PowerMore 250. Spring is here and it’s time to start planning some missions.