Replaced battery, new battery will not work unless plugged in

My razer laptop is about 4 years old, the battery capacity was down to about 75%. I replaced the battery a few days ago and right after changing it I was able to power it on. I left it charging for a while to calibrate the battery, and tried to turn it on today. It won’t turn on now unless plugged in. I put the old battery back in, it works fine. The pins on the new battery connector all look good on both the battery and the motherboard. When plugged in, it shows the new battery at 94% and will not go higher than that, but shuts off immediately when unplugged. Could this be a defective battery? Is there anything else I’d need to do to get it to work??