SoloGood 170A High Current Antispark QS10-S Male Female Connectors Plugs with 4Pin Signal for Drone RV E-Bike Battery Charger(Black, 1 Pair)

Solutions, since the other bikes batteries don't fit as others have said. The S (at least the 2025) use Samsung 50E cells. 50E is designed for maximum runtime and high energy density rather than high power. By power we're talking current (aka amp draw). With the limitations of space, you're stuck with Ah capacity cap. So you're main option if you're looking for longer ride time with higher amp draw, without swapping batteries, is building outside of the original size. If you were to utilize space above and beyond the battery door, you can add more cells. I'd also make the battery connection face down on the battery with the bike connector facing up. Both would be fixed in place so when you remove or insert the battery, it automatically makes a connection. Similar to how 48 volt ebike batteries can be slotted in, just with a different connector. Likely use a qs10 or qs12 connector The qs10 anti-Spark https://www.amazon.com/dp/B0C58LG2CS The anti-Spark qs12 https://www.amazon.com/dp/B09XKH8415 Using either would let you also swap the signal wires/4-pin so that you only have a single connection for everything on the battery going to the bike. Pretty sure the smaller cable is 4 pin.. been ages since I looked at it.