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My old 2013s charger is also rated for 58.1v volts. I'm sure that something will start to smoke if you connect this charger to the 116V of the newer battery. It is possible that you can use two chargers in series but i would not try that, it also can go very wrong.

I think that the contactors inside the battery are not closed until the charger enables them over the can bus.

I have the same issue, did also post here about it. It works with the 1.2.8 APKG for me.

I think the APK should have the folowing checksums
SHA256 910a59165d0c5639d0157f86cbc848e4ce794e60058bbca20088f46efc4a1063
MD5 e288c46b5b8c618b2581ae3e7cc44424

My guess is that something went wrong with a firmware update, my 2016 FXS did not have the correct configuration in the firmware, the model was not set which resulted in issues with the odometer. I did solve the configuration issue with an USB-TTL Cable, but bluetooth still does show up as RN-IAP-XXXX and pairing does only work with the 1.2.8 APKG

I think that the bluetooth module is not initialized correctly by the MBB or has a firmware without the correct configuration.

I did not go to the dealer with this issue because i'm not sure that he can resolve this issue in one day and i need the FXS to get back home. The odometer issue was not resolved by zero and the dealer that sold me the motorcycle. I'm not complaining about the dealer here, he can't do much without the help from Zero.

I have a 2016 FXS, i'm also interessted in adding a supercharger. There is no space in the tank but i have two ideas where to mount the supercharger, one would be in or under a top case and the other variant would be to replace the original charger, i'm not sure if this is possible and if there is enough space for a supercharger.

My dealer did resolve the odometer issue somehow with help from Zero, but now the Bluetooth dosn't work. I have a 2016  Zero FXS.

I got older versions of the APK from apkpure.com will try that later. I did try Phones that are newer and older than the Zero. Newer phones do see the RN-IAP-XXXX device in bluetooth settings, i do not remember seeing it with the older phone. All Phones do have Bluetooth and BLE, not suer if this is relevant.

I bought an used 2016 Zero FXS the latest firmware is installed. I tried to pair it with my android phone and it dosn't work. The app dosn't find the Zero and when use the System bluetooth menu i find a bluetooth device with the name RN-IAP-XXXX XXXX is a four digit hex number. I've tried about four phones, it dosn't work. Rebooting the phones or killing the App dosn't help. The bluetooth symbol on the zero is blinking and dosn't stop blinking when i use the settings app to pair the phone. Any Ideas?

My dealer is too far away so i can't easily drive there for another firmware update. I could load the zero into my van but i do not want to do that if there is another solution.