Step 1: Turn off the 3ds, dont use it when you dont need it especially when you decide to put it on sleep mode which honestly is just a crappy way of making you waste more battery life on the 3ds.
Step 2: If you do decide to ignore Step 1 then atleast keep the ac adapter with you at all times.
Step 3: Turn off your wi-fi as this will also cause battery shortage.
Step 4: Adjust your system brightness, as this is another excellent way of maintaing life on 3ds.
Step 5: Activate the Power Save mode trust me it works.
With all that said, i know this all seems like elementary stuff but trust me your lithium battery is like a pet, if not properly taken care of it could wear out and youll be stuck with around and hour of battery life, trust me on this one. Farewell.
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