Rosetta indipendent telemetries analysis

Charts obtained from raw telemetries.
Official charts are here and here (currently offline, 26/6/2015) .
My telemetries javascript converter to Excel format is here.
Some values for both batteries appear invalid (invalid = max voltage).
From Rosetta Lander User Manual it results that Philae has 2 rechargeable batteries (namely "secondary"): a second battery has been added to the design in a second instance, resulting in it not being connected to control electronics (BMS - battery management system). Using lithium batteries without BMS easily leads to battery malfunction and permanent damage.

Primary battery (not rechargeable):
32 Li/SICl2 cells 3.65V/13 Ah
4 separated strings in parallel, 7 cells in series per each string (7S4P)
Each string is 25,55V/13Ah/332Wh
Battery is 25,55/52Ah/1328Wh
min/max volt: not specified


Rechargeable battery 1:
28 cells 3.6V/1.5 Ah
7S2P (25.2V/3Ah/75.6Wh)
Full charge (100% SoC): 29.4V
10% SoC: 21.7V
Damage voltage: 17,5V

Rechargeable battery 2:
2 separated strings, 7 cell in series each one; not connected to BMS.
Same voltages above apply.
Total rechargeable capacity: 151 Wh.




From this combined chart it can be deduced what first two columns of raw telemetries contain:
Column 1: Primary Battery voltage
Column 2: Secondary battery voltage
Indeed, when current rate increases there is a voltage sag in the corresponding column.

Next 7 columns are known from official telemetries page:
Column 3: PSSH2_C_LCL1_M
Column 4: PSSH2_C_LCL1_R
Column 5: PSSH_C_HPC_IN
Column 6: PSSH_C_LPC_IN
Column 7: PSSH_C_SBat_CH
Column 8: PSSH_C_SBat_DCH
Column 9: PSSH_C_ PBat DCH

Acronyms:
PSS = Power Sub System
LPC = Low Power Converter (DC/DC)
HPC = High Power Converter (DC/DC)
LCL1 = Latching Current Limiter (ESS / Lander operational power supply) (M=Main, R=Redundant)
SBat_CH = Charging current for secondary battery
SBat_DCH = Discharging current for secondary battery
PBat_DCH = Discharging current for primary battery


Telemetries appear to show:


Secondary battery started charging, with some difficulties, since 13/6, but effective recharging occurred only from 20/6 on.
Charge appears to have quite stopped on 24/6. Voltage telemetry values for 24/6 appear invalid (28V like on 20/6, when 40 wrong samples (~28V) were recorded in one minute).

Battery is currently at 24.46V out of 27.6 V max voltage reached during primary mission and out of 29.4 max theoretical voltage (4.20*7). Depleted voltage is 21.7V (SoC 10%). But Lithium battery charging curve is all but linear: from the chart, from 22.0 to 26.7V the battery must be considered as depleted as it is working after the "knee" in the curve (but in last minutes a very high current was extracted from battery: hundreds of mA rather than dozens as in previous days, hence affecting the voltage curve with big sag).



Detailed recharge charts day by day: