This is going to be a piece of advice for TOTK, not sure how to spoiler tag on this platform yet, so if you're not interested just skip on by. This is not really a spoiler in any sense though.

I went a huge portion of the game without upgrading my battery. I had 600 of the charge things before I figured it out, enough to triple my battery life. There's a construct you encounter on the tutorial island who tells you how to upgrade your battery, but it's way too soon for you to be able to afford it. There's just way too much vocabulary going around at the time so I totally missed it. There's another construct on a big rock behind the first little settlement you find on the ground, in front of Hyrule castle. Either of those places are easy to warp too. They charge 100 of the upside down triangle charges to give an extra battery notch. You can add one at a time; you don't have to wait to have 300 to add a whole new battery. The depths are the easiest place to get more of those charges. You will not max out the battery capacity for a very long time unless you make it your full time job.