"Should I buy a PowerTube 500 or 625? How far will I really go?". Bosch advertises flattering marketing range figures that never hold up in real life. Here's the actual data.
The 4 Bosch capacities in 2026
Model
Capacity
Weight
Format
Compatible CX 2024
PowerTube 400
400 Wh
2.3 kg
60×80×335 mm
Yes (legacy)
PowerTube 500
500 Wh
2.6 kg
65×80×349 mm
Yes
PowerTube 625
625 Wh
3.5 kg
65×80×425 mm
Yes
PowerTube 750
750 Wh
4.0 kg
65×80×425 mm
Yes
PowerTube 800
800 Wh
4.4 kg
65×80×425 mm
Yes (new 2024)
Note: the 625, 750 and 800 share the same external format. You can upgrade without changing the frame.
The basic formula
On a Bosch CX 2024, average consumption in mixed mode is 7–10 Wh/km depending on profile. So:
Battery
7 Wh/km consumption
10 Wh/km consumption
400 Wh
57 km
40 km
500 Wh
71 km
50 km
625 Wh
89 km
62 km
750 Wh
107 km
75 km
800 Wh
114 km
80 km
Variables that change everything
Assistance mode — factor ×3
Mode
Typical consumption
Eco (×1.4)
5 Wh/km
Tour (×2.5)
7 Wh/km
eMTB (auto)
9 Wh/km
Turbo (×3.4)
14 Wh/km
Boost
18 Wh/km
Switching to Eco instead of Tour nearly doubles range on a hilly route.
Rider weight — factor ×1.5
60 kg rider → consumption -15%
80 kg rider → reference
100 kg rider → consumption +20%
120 kg rider → consumption +35%
Terrain — factor ×2
Profile
Multiplier
Flat urban
×1.0
Moderate hills
×1.3
Sustained climb
×1.8
All-mountain MTB
×2.0
Temperature — factor ×1.25
25°C → reference (capacity 100%)
10°C → -10%
0°C → -25%
-10°C → -40%
This is why winter range collapses. Keep your battery indoors between 15 and 25°C and take it out at the last moment.
Real range table — calculated
80 kg rider, moderate hilly terrain, 15°C, full suspension MTB, Trail mode:
Battery
Expected range
500 Wh
45–55 km
625 Wh
56–69 km
750 Wh
68–83 km
800 Wh
72–89 km
Same rider, flat urban terrain, Tour mode:
Battery
Expected range
500 Wh
65–80 km
625 Wh
81–100 km
750 Wh
97–120 km
800 Wh
104–128 km
Same rider, committed enduro MTB, eMTB mode:
Battery
Expected range
500 Wh
30–40 km
625 Wh
37–50 km
750 Wh
45–60 km
800 Wh
48–64 km
How to optimise without changing battery
1. Pedal before the assistance kicks back in
At 25 km/h, assistance cuts out. If you ease up and lose 5 km/h on a climb, assistance restarts → consumption ×2 over 100 m. Pedal smoothly, maintain speed.
2. Eco mode on the flat
On 80 km of flat, switching to Eco saves 200 Wh = 25 km extra.
3. High tyre pressure
On MTB, raising from 1.5 to 1.8 bar saves ~8% on road. Not ideal for off-road grip, but relevant on tarmac transitions.
4. Keep the battery warm
If you're starting at 5°C, keep it indoors until departure. A PowerTube at 20°C will give you ~15% more range than at 5°C.
What about Range Extender batteries?
Bosch offers the PowerMore 250 (250 Wh extra in a bottle cage mount, 1.8 kg). Compatible with CX 2024 Smart System.
Combined: 625 + 250 = 875 Wh usable
Combined: 800 + 250 = 1050 Wh usable
The Kiox display shows consumption prioritised from the Range Extender (emptied first). Handy for long-distance outings.
Battery lifespan
Bosch guarantees 2 years or 500 full cycles.
In real usage:
~1000 cycles at 80% capacity (= ~75,000 km for a PowerTube 750)
Capacity begins to drop noticeably after 1500 cycles
To preserve:
Charge to 80% for long storage (Bosch has a "Storage Mode" function)
Avoid total discharge (keep >20%)
Store between 15 and 25°C
Unsure which battery capacity to choose? The mechanic AI calculates your actual range based on your weight, your typical route, and your usual mode.
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