Great advice on the battery and black background. That should help a lot. I also went with a 10ah lithium for my helix 7. So far it hasn’t come off 100% battery reading but I’ve only used it for about 5 hours straight st any one time.
I've read that the Helix with the Lithium batteries tend to read 100% even when they are lower than that from use. The Helix units are designed for the lead acid batteries and will read those correctly.
So if you used your Helix for five hours, I'm sure it wasn't still 100% but read that anyway. It's has something to do with how a lithium battery operates, being they give off a constant voltage until they die.
Unlike the lead acid batteries that slowly drop in voltage while they are in the process of depleting.
So just make sure you charge your battery after use. That way you can be sure you don't run out of juice on your next trip.