Why isn't my device powering on?

I have an LG-E739 [T-Mobile MyTouch 4G] that I am planning on using as an extra camera. However, it's been several years since I last used it and now it won't boot. The device wouldn't charge when I plugged it in, so I had replaced the battery to make sure.. It still won't charge. Could this likely be that the device is completely dead?

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