How long does the battery last?

We are working hard to maximize the battery life. We have chosen to utilize a rechargeable lithium battery to power the Northern Star. Two batteries will be included with each purchase. This allows the firefighter to return to station when the job is done and swap his/her low battery for a fully charged battery and be back in service immediately. Firefighters can expect to get 6-8 hours of run time off of one battery depending on temperature and other mitigating factors.