How to extend the life of a rechargeable battery?

On an upcoming camping safari trip I will not have access to electricity to recharge my digital camera for approximately 10 days. I have purchased two extra batteries but I am wondering if there is any thing else I can do to extend the life of the battery when I taking pictures. I have a Pentex Optio 750Z.How to extend the life of a rechargeable battery?Get a car charger I have one and it works greatHow to extend the life of a rechargeable battery?I would bring 4 to 8 extra alkaline batteries with you as a back up. You can extend the life by keeping them cold. Enjoy your trip!How to extend the life of a rechargeable battery?Well in my culture we recharge batteries by putting them inside the frezzer over night.