Time lapse battery test of the New 3DS and New 3DS XL with big Mugen battery fitted.

Here’s how the different handhelds fared:
3 hours 45 minutes – Original 3DS
4 hours 5 minutes – 2DS
4 hours 32 minutes – 3DS XL
4 hours 38 minutes – New 3DS with 1400mAh Standard battery
14 hours 39 minutes – 3DS XL with Mugen 6250 mAh battery
15 hours 2 minutes – New 3DS XL with 6250 mAh Mugen battery
15 hours 58 minute – New 3DS with 5000 mAh Mugen battery

We inadvertently also recorded how much gaming and TV watching the family did during the day:
Minecraft 7-8am and 11.20-1.20pm and 3.00-4.45pm and 5.15-5.30 = 5 hours
FIFA 8.30-9.30am and 2.30-3.00pm = 1 hours 30 minutes
iPad 3.00-3.30pm = 30 minutes
TV watching 6.00-9.30pm and 10:30-11:45pm = 4 hours 45 minutes.