The rechargeable packs use nickel‑metal hydride (NiMH) cells. Some kits note the cells are non‑universal NiMH — check the product details if you need a specific cell type.

Capacities vary by model: some docks can charge up to four battery packs simultaneously, while many dual chargers or stands support charging two controllers or two packs at once. Verify the charger’s capacity on the product listing.

The listings show battery capacities of 800 mAh and 1100 mAh.

Reported safety features include over‑voltage and over‑current protection, anti‑reverse insertion to prevent incorrect placement, and a NiMH battery charging management IC that monitors cell voltage during charging. Check the product page for a full list of protections.

Several chargers use LED indicators to show charge status—commonly a red LED while charging and green when fully charged. Some docks include per‑slot LEDs so each battery or controller has its own status light; confirm per‑slot indicators on the product page if needed.