Your battery is within warranty because you purchased the laptop less than 2 years ago.
You didn’t, the 61Wh battery is less reliable than the older 55Wh battery. Framework said that’s because of a higher energy density, some redditors think ATL is not reputable but I highly doubt it. I think the BMS is inaccurately calibrated which can leads to inaccurate battery health reading at best or shorten the battery longevity at worst. Nevertheless, it’s not your fault.
Without the RTC cell your computer is going to spend a long time doing “DDR5 memory training” each time booting. Other than that, normal operation.
Not all battery failures ended up in swelling. Some of them might be invisible such as unsafe imbalance (>200mV between cells). However it’s not easy to check because your computer can’t boot up with battery to type framework_tool --smartbattery. Then again, further identifying the problem is unnecessary as your battery is still within warranty and you can get a free replacement from support.
Many other laptops use “bypass charging” or “reverse boost” topology where the system voltage (VSYS) is equal to power adapter voltage (VADP), in this case, 20V. A buck or buck-boost converter is between VSYS and VBAT rail to charge the battery. These laptops will work happily without a battery.
The FL13 uses Narrow VDC topology, which uses a buck-boost converter to convert that 20V(if you use a 60W or 100W charger) into a VSYS “one notch above” VBAT to charge the battery while providing power to the system. If the battery is absent the VSYS and Charger Voltage are the same 15400mV. If the battery is limited to a setting, the VSYS will be a bit higher than VBAT. If the battery is charging normally the “Charger Voltage” will be 17800mV but the actual VSYS is still slightly higher that VBAT but will eventually be 17800mV if you decide to charge it to 100%. If the battery has failed, computers with Narrow VDC may be unable to boot as it doesn’t know what voltage to put into VSYS.
In your current case, the battery is absent so the Charger Current is 0.