I haven't used my down low glow in about a year. Will they work if i charge them up now?

If your DLG battery has been sitting unused for 1 year, there is a small chance it will have have gone stale. But you can check this easily by charging your DLG fully, and seeing what kind of glow-time you're getting. Compare the numbers you're getting to the glow times we have spec'ed for a new battery, and you'll know whether there's been any damage to your battery.