Trend AIR/P/4 3.6V 3.5Ah Ni-MH 8 hour replacement battery for the Trend AirShield Pro. The AIR/P/4 uses Ni-MH (Nickel Metal Hydride) technology. With no memory affect these batteries can be "topped up" or charged at anytime without affecting battery life. Ni-MH batteries also tend to out-perform Ni-CD batteries in high drain applications.
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