Hospital and EMS environments are considered “high use” environments. This pace of environment and frequent use can consume the useful life of an AED battery in a short period of time. The Philips FR2 Rechargeable battery may be the best and most economical solution for this situation. (If your AED is not in this environment but rather one that is likely not to be used frequently, you can choose the long- life non-rechargeable lithium battery.)