I have the DC2069A kit with LT8490.
I have plenty of new SLA batteries and the original charger usually charge them up to 13.5V (DMM float measured).
Usually, I use an electronic load to discharge them to around 12.5V to test charger.
Then I use DC2069 with PSU 30V input to charge this SLA.
It worked, during the tests a few months ago.
This week, I try them again, all failed.
I checked their voltage, most of them at around 12.xx up to 13V. LT8490 should be able to charge them.
I check the UART and I always get the UART stream of "000100" (S2S1S0, F2F1F0) with 4 red LED flashing with all the kits connected to my batteries.
This happen with or without grounding Config1 and Config2 to disable the features.
Why is that so?
(I have 4 of this new kits and 6 SLA batteriess. It could not be coincidence.)