@muhammadbilal1
The batteries for Starling are standard Lithium Ion batteries (not Lithium Polymer). The recommended charging rate for Li-Ion batteries is 1C, so if the capacity is 3000mAh, the maximum charging rate is 3A. Charging at slower rates will extend the battery life (as is true for all batteries).
The maximum voltage is 4.2V. Please use a charger setting that specifically supports Li-Ion batteries. Most LiPo chargers also support Li-Ion batteries.
I will check how to proceed regarding the missing adapter.