After updates, the battery charge only decreases.
I downgrade the firmware version, the battery was charging but very weakly, and then the system stopped booting, so I reverted to the latest version.
For me I had this for 1-2 months now. Sometimes when then charge drops below 40% (and especially 25%), there is chance it will arrive to the loop: “charge for 15-30 seconds, then keep the amperes at around 0 no matter the load”. And the batteries are a bit disbalanced during this activity, the last time it was 3.8 and 4.1 V. It helps either to discharge to 0 and then charge back, or to re-plug every 30 seconds.
Anyway, it seems to be stable once it becomes more than 3.9-4.0 V.