Fitbit Blaze battery replacement

I absolutely love my blaze, and use it to track everything. As of late, my battery has only been lasting a day and a half. I purchased my blaze on launch, and received a replacement about 4 months ago due to bad battery life. Now this replacment blaze's battery life is even more terrible.

I want it to last at least 3-4 days +

I contacted Fitbit for a replacement again, and they only offered 25% off because the warranty from the original Fitbit was expired. The warranty didn't reset when I got the replacement.

I am now looking to replace the battery myself with some guidance. I have done iPhone and iPad batteries, so I thought why not replace the battery on my blaze so I don't have to buy a new one?

Is there ANY resources such as batteries and/or video guides online to replace it? I couldn't find any.

Please don't respond with suggestions to buy another one , or contact Fitbit again. Thanks.