When you are shooting for pay, always make sure that you carry:

• A spare camera battery.
• Spare batteries for your flash.
• Some Alkaline AAs.
• Spare memory cards.
• A spare flash.
• Spares for essential cables (e.g. to connect your flash to your camera or pocketwizards).
• Even, if at all possible, a spare camera.

That way you can offer your customer peace of mind, and you can rest assured that the price you charge is worth it – “Uncle Bob”, after all, does not carry the spares above.

I have been saved more than a few times by the spares above – yes, all of them.