This adapter adapts a battery with an IC2 connector to a device with an IC3 connector
Primary used to Charge Spektrum Smart Batteries equipped with an IC2 connector

- This adapter adapts a battery with an IC2 connector to a device with an IC3 connector
Product Specs
Prop 65

Compatibility
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FAQ
https://www.horizonhobby.com/product/one-piece-battery-adapter-ic3-device-ic2-battery-2/SPMXCA520.html
Yes, It will charge that battery. Please make sure the charger is a Spektrum charger that is updated with the G2 firmware.
A Smart G2 battery does require a Smart charger (either G1 or G2).
You could use the Spektrum 3S 800mAh battery with JST-RCY connector and not need any adapters. SPMX8003SJ50
Please note – Spektrum IC2 connectors and charge leads ARE NOT compatible with EC2 connectors
Product Details
In The Box
- (1) Adapter