Energy Efficiency
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“Before completion: Upgrade your jade bot to gather more energy from jade tech batteries.
Additionally, your jade bot can now absorb energy from zip lines.After completion: Your jade bot will now get 2 charges from jade batteries, to a maximum of 4. Your jade bot can now gather charges from zip lines.
You can now craft tier 7 and tier 8 power cores.— In-game description
Energy Efficiency is a mastery that further upgrades the jade bot to hold additional charges and allows the player to craft higher tier Power Cores.
Notes
Jade Power Charges can be obtained by interacting with 
Jade Batteries around Cantha.- Without the mastery, you can obtain only one charge per battery.
