Phone battery is swollen, how do I fix it?

Hi Sylvester,

Yeah, a swollen battery is bad and you absolutely need to replace it ASAP. The swelling indicates that the chemical reaction inside the battery is no longer working efficiently and is generating gas instead of electricity. As it continues to deteriorate, the internal resistance will go up until it gets so bad that it can ignite, much like the old Samsung Galaxy Note 7 phones did.

Sorry to say that iFixit doesn't have a guide to replacing the phone that you can use, but there's a French site called SOSav that does.

Battery Huawei Nova repair - Free guide - SOSav

The batteries appear to be readily available on places like Amazon, eBay and AliExpress. You may be able to get a part number off the battery itself that would help with locating a replacement.