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Originally posted by XinTX:

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Most AED manufacturers have a proprietary battery that are very expensive and most need to be replaced every 2 years, this one takes CR123A batteries that you can change yourself. And the life cycle for them is 5 years as opposed to most others which is 2 years.Pads carry a 5 year life cycle as well which is longest in the industry.

^This. We have Defibtech units. Proprietary battery that says it's good for 5 years, but will without warning start barking 6 months prior to it actually expiring. I've talked to them and told them it's a bad design. Should have a 'warning' (that you can silence) 6 months prior to expiration, then one you can't once it's done. But it starts beeping ~6 months prior to the battery end of life. Pads are good for 2 years. Once they expire, you get the same warning beep you cannot silence. The battery goes for ~$170 and the pads about $60. Defibtech CS are also jerks.