I was changing icons around in the framework-res as I do to get the pack I desire throughout the phone. I found some blue based battery icons from an early D1 apk but they only had the 20% increments. So I took the watermark theme batteries with the green color for full and modified some. I like a more "supportive" color when it gets down to the 60-50 mark so I adjusted from there up. Also a few of the charging ones. Free for the taking. Pretty easy mod.