This is a brand new Acer Aspire 4820 battery. This battery is compatible with the Aspire 4820, 4820G, 4820T, 4820TG, 5820, 5820G, 5820T, 5820TG, 5820TZ, 5820TZG and Aspire 4745, 4745G, 4745Z 7745 laptop models.

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Li-ion batteries are not subject to the memory effect common with older battery technology. This means you can recharge your laptop any time without diminishing your battery capacity. This Aspire battery replacement is typically superior to the original battery and is 100% compatible with your Acer notebook computer. Each battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 2 - 3 hours of run time with this Acer 4820 battery when new, depending on your energy use. This battery replaces the Acer Aspire 4820, 4820G, 4820T, 4820TG, 5820, 5820G, 5820T, 5820TG, 5820TZ, 5820TZG and Aspire 4745, 4745G, 4745Z series laptop batteries and additional machines which are listed at the extreme bottom of this web page.