Battery life is a very important feature when analyzing GPS watches, but it is even more so when you use them for hiking. When you go for a hike, you do not have the privilege of simply connecting your watch to energy supply in the middle of nowhere. If it does not take external batteries, you may end up in a pickle. If you know for certain that your watch will not hold up for the time you will be hiking in the woods, consider taking a portable battery pack alongside you.
Not only do they typically feature a rechargeable battery of their own but you can also plug a USB cable into one of the ports on the pack. Now, this will require your GPS watch to have the means to charge with a USB cable. If not, there are some tips you can take to prolong the battery life as long as possible. When you are not using the GPS on your watch, turn it off. Even if this is for short bursts, do not leave it on the entire time if you know the battery will not last.