The J35 does not serve as a DC-DC charger.
We offer several kinds of DC-DC chargers:
https://teambmpro.com/product-category/dc-dc-chargers/
The MiniBoost is able to connect directly to the J35:
https://teambmpro.com/products/dc-dc-charger-miniboost/
Does the J35 serve as a DC-DC charger?
