One of the issues people have with the H batteries, is the contacts. Another is the inability to know if a given battery is charged or not. Here's a simple solution to both issues. A colored cap that both protects the contacts and indicates the charge state of the battery. Typhoon H Battery Contact Protector Sold in the USA by Drone Mountain These come in two colors, red or green. Use one color to indicate a charged battery and the other color to indicate a depleted battery. They come in a set of four for $10, or a multi-pack with four of each color for $15.