We use various types of batteries on our investigations from 9 Volt PP3 - AAA - AA.

It is essential to have lots of spare batteries on investigations in case of battery drain. We have found it is well worth using a decent qaulity Alkaline such as the ones sold at Maplins or if you can afford them Lithium are amazing particular in our full spectrum camera and IR Floods they can last for several investigations.

A very useful tool for testing any batteries before or during an investigation. These again can purchased for about £5 we got ours from Maplins.