The details
- The Mars 2.0 runs a 48V quick-release battery that locks to the frame with a key and can be charged on or off the bike.
- Heybike's official store lists a dedicated Mars 2.0 spare battery. The 750W version's pack is commonly listed at 12.5Ah, but confirm capacity against the label on your own battery rather than a store page.
- Heybike's own listing and retailer notes agree that the 1000W version's battery works in both models, but the 750W battery does not work in the 1000W bike. Buying the wrong direction is the most common return.
- The original Mars (1.0) uses a different battery with a different mount. Mars and Mars 2.0 packs do not interchange despite the shared name.
Where to buy
In order of how owner communities rank them:
- Heybike's official store: guaranteed fitment for your model version, sold as a keyed, lockable pack matching the original.
- Established ebike parts retailers that stock the genuine Heybike spare, useful when the official store is out of stock.
- Third-party compatible packs (YOSE Power is the name that comes up most): these exist for the Mars line, but listings frequently target the Mars 1.0, so read the compatibility line carefully and match connector and rail style to your original.
Which variant this covers
This answer covers the Mars 2.0, both 750W and 1000W builds. Your motor rating is on the original spec sheet and typically on the motor casing or bike documentation. If you cannot find it, Heybike support can identify the version from your serial number, and that one check prevents the only real fitment mistake with this bike.
The trap to avoid
Two traps, both naming related. First, listings titled for the Heybike Mars often mean the original Mars 1.0, whose battery does not fit the 2.0. Second, within the Mars 2.0 line, a 750W pack ordered for a 1000W bike will not serve it, while the reverse pairing works. If a listing does not state which motor version it supports, assume it is the 750W pack and verify before paying.
What owners actually do
The dominant pattern in Heybike owner groups is buying the official spare as a second battery for range doubling on the rack, then rotating both packs so neither sits at full charge for months. Owners who went third party mostly did it during official stock gaps, and the successful ones matched the connector, the rail mount, and the lock position against photos of their own pack before ordering.