Various materials are available including leather and neoprene. Extra batteries - Wireless phone batteries are rechargeable but not infinitely. A rechargeable battery can accept 200 to 400 recharges before it needs to be replaced. Having a spare charged battery ensures that you will always have power. Battery capacity is measured in talk time or standby time.
Digital phones consume less power than analog phones.
Travel charger - Phones are usually sold with standard AC battery chargers. Rapid travel chargers can cut charge time in half. Charging times vary based on the type of phone and battery. A rapid battery charger can charge a lithium-ion battery used with a digital phone in two hours, compared to four hours by a standard charger. Rapid chargers for the car plug into the cigarette lighter adapter and can provide a full charge in two hours.