You can pickup a charger a Luna Cycle https://lunacycle.com/36v-2amp-charger-for-sondors-and-other-36v-bottle-packs/
You need to remove the battery connector from the old charger and attach it to the new charger.
I was told by a Emotion Sales Manager a new Bluetooth module will be released at Interbike in Las Vegas next month. With your smartphone and the module you will be able to dial the PAS assist from 1%-100%.