Our Range Test, explained above, is designed primarily to evaluate an e-bikes battery capacity and the efficiency of its motor/battery pairing.
The EUYbike S4 is an unusual case (we seem to have a lot of those, for various reasons) due to a few distinguishing factors. First, with the battery’s capacity. The S4’s webpage advertises a 48V, 25 amp-hour (Ah) or 1,200 watt-hour (Wh) unit, but the one on our test bike was a 20 Ah or 960 Wh power source. We reached out to the company for clarification, and they advised us that the battery capacity has been upgraded. Larger capacity is always appreciated, but we were only able to evaluate the older, smaller capacity unit.
Next, regarding the range estimates advertised by EUYbike; the S4’s webpage states a throttle-only range between 40 and 44 miles, and a pedal-assist result between 49 and 75 miles. These figures were calculated based on the larger 1,2000 Wh battery and the differing speed limitations I mentioned previously, and so are not quite accurate for comparison purposes.
We measured a distance of nearly 28 miles in PAS 5 and around 49 miles in PAS 1, which might not seem fantastic when compared to EUY’s claimed range, but are both very good when compared to similar e-bikes we have tested. The battery on our test bike didn’t have quite enough power in reserve to push the S4 to the top spot among moped-style e-bikes, but we can estimate that the bike would have ended up at – or near – that position with the larger 1200 Wh supply.
We don’t often test e-bikes with battery watt-hour ratings so close to (or exceeding) the 1000 Wh mark. We also don’t often have the opportunity to evaluate 1000W motors, which of course are considerably more voracious than 750W units. There are relationships between these specs that we discuss in our guide to e-bike batteriesbut our results indicate that the S4’s motor/battery pairing is efficient.
It’s worth noting that we do not (currently) evaluate range using just throttle power in our Range Test, and so cannot speak to the accuracy of EUYbike’s estimate of 44 miles – but that, too would likely be affected by the smaller battery on our S4.
Regardless of the differences between our results and the range and speed estimates/calculations made by EUY, we are satisfied with the distances we measured. The S4 demonstrated that it has endurance for a moderately lengthy trip in its max-assist setting, and users who want to extend its range can opt to ride the bike in lower (but no less capable) settings.
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