|New Intellect 8.4 Volt Nickel-Metal Hydride cells with Large Tamiya (Marui) connector.
WARNING: Do not overcharge batteries! If they overheat, you could cause damage to the battery and create a potential fire hazard! Calculate the proper amount of time required to charge a battery by dividing the battery's milliamp capacity by the chargers charge rate, e.g. it would take a 500 mah rate charger ~ 3 hours to charge a completely drained 1500 mah battery.
If you are not certain of a battery's remaining charge and you wish to charge it, place the battery on the charger and check it every 5-10 minutes. If the battery is warm to the touch, assume it is fully charged. No longer than 3 hours for model # SDERBAT12-LARGE