Recommendations needed: Rechargeable batteries for camera traps

We are exploring rechargeable battery options, particularly for Cuddeback XChange Color (C1) models. These cameras use 8x AA batteries, and ideally need a charge of 1.5V for optimal opperatiion. Commercial recharcheable NiMH batteries available in South Africa only has a charge of 1.2V which aparently is not advisiable for peak cam performance. 

An alternative to rechargeable AA batteries presented to us is an external Sealed Lead Acid (SLA) 12V batteries connected to the terminals. However, with theft and tampering by baboons we're not too keen on using external battery sources. 

Would appreciate any advice or recommendations!