Bosch 800 Wh battery & online battery check

800 Wh
The Bosch PowerPack 800 has been out in various online stores for weeks, and now the official Bosch press release finally reached us. The new Bosch Powerpack 800 is the old Powerpack 725, only with new cells. Good news, you might say, especially if you ride a cargobike with external batteries. Some cargo bikes can take two 800 Wh batteries, providing 1.600 Wh capacity for hauling heavy stuff. Newer emtbs use the Bosch Powertube 750 though, and that’s not updated. Not yet anyway.

The Bosch Powerpack 800 is the same size as the old Powerpack 725. It uses basically the same enclosure, and it has a claimed weight of 3.9 kg. That’s about 100 g more than the 725.


New-ish cells​

So, how is this possible? Well, Giant have been selling bikes with 400 and 800 Wh batteries for a year or two now. Rumor has it Panasonic developed a slightly different 21700 format cell for Giant. The cell hasn’t got a new chemistry, but it’s marginally bigger and is sometimes referred to as 22700. This means it’s slightly wider and a couple of grams heavier. The increased volume takes the cell capacity up from 5 Ah to 5.56 Ah.

The Bosch CompactTube 400 from 2023 has the same 5.56 Ah cells.

The Bosch CompactTube 400 from 2023 has the same 5.56 Ah cells.

Why not more?​

And it seems Bosch is using the same 5.56 Ah cell. In fact, they started using it in the CompatTube 400 battery that was introduced last summer. Since then, we’ve seen a few bikes using a Trend Power battery with 5.8 Ah cells. Why doesn’t Bosch use those instead?

We use the 5.56 Ah cells for safety reasons.

That was the short statement I received. And it makes sense. Manufacturers such as Bosch, Giant and Shimano always were quite conservative designing their battery packs, making slightly heavier batteries than the 3rd party manufacturers. One could argue cells with the “old” chemistry with less nickel is safer. And it’s not like Bosch is sacrificing much. Using the “ultra high nickel” 5.8 Ah cells would have yielded an additional 35 Wh while weighing not even 100 g less.

The PowerTube 750 is the battery we emtb'ers care about. Unfortunately it uses smaller cells, so I don't know what to expect.

The PowerTube 750 is the battery we emtb'ers care about. Unfortunately it uses the smaller 18650 cells, so I don't know if we can expect an update for this relatively new pack.

Online battery check when purchasing a used ebike​

This isn’t as cool as it sounds, I think. You can’t connect your battery the online battery check service and get a health status. Your bike shop should be able to do that though. But it can still be helpful. If you enter the battery serial number in the online battery check service, you’ll know if the battery has already been serviced, opened or deemed defect by Bosch. The idea is you use this service before buying a used ebike with a Bosch battery.

My made-up serial number yielded no errors.

My made-up serial number yielded no errors.
About author
Started mountainbiking in the 90s. Moved to emtbs in 2014 and have been reviewing them since 2016. Contact me here


I think your headline is inaccurate, as there were tens of thousands of eMTBs made from the mid-2010s until maybe 2018.
For example, I still have a couple of "old school" eMTBs (vintage 🤔 2015 and 2017) that have Bosch external batteries.

This 800Wh will work on them when my old ones become unusable, which could still be awhile cuz I take exquisite care of them...
Correction: ... there were tens of thousands of eMTBs made with external batteries from the mid-2010s until maybe 2018.
I was thinking the 725/800 packs wouldn’t fit most older emtbs. But I guess you’re right, I changed the heading.
If the new batteries are part of the Smart System ecosystem they won’t work with older bikes.
Specialized needs to rework their SL battery as such. Their current battery is just OK for Creo and too small for doing epics on the Levo SL,. Range extenders suck with their extra weight and use of the water bottle space. At least Orbea recognized this shortcoming on the Rise that now fits a 540wh battery, capable of 70 miles/6000 ft for me a larger/taller rider.
I talked about the 22700 Panasonic cells since the Giant Energypak 800 was released last year, but no one had an Idea what I meant as everyone just knew about the 21700s.

This is a description of the Energypak 800 from last year...

With the Giant EnergyPak Smart 800 e-bike battery Giant sets new standards. The Energypak Smart 800 is the very latest battery generation and allows, thanks to exclusive cell technology, enormous ranges of up to 290 km. It is equipped with the modern and advanced 22700 Panasonic cells and shines with brutal efficiency, despite compact dimensions.
This is a huge deal for Lapierre GLP3 owners, which some consider the most "racy" emtb out there.

I have ridden my giant 800Wh equipped reign with GLP3 owners with their 725Wh batteries, all of us on max power. We pretty much all ended under 10% after 1600m of climbing, despite the Bosch guys having quite a bit more assist help from their motors, some in Race mode.

One fit and lean rider reckons he could get 2000m of climbing out a single 800Wh battery in race mode which is bonkers. Once they upgrade the powertube ones into the 800Wh+ range, Bosch will be so far ahead of the competition...