Rainbow Electronics GM862-QUAD-PY - Manual (Page 168)

AT Commands Reference Guide
80000ST10025a Rev. 5 - 09/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 168 of 434
+ CBC - Battery Charge SELINT 2
Test command to be defined.
Example
AT+CBC
+CBC: 0,75
OK
Note The ME does not make differences between being powered by a battery or
by a power supply on the VBATT pins, so it is not possible to distinguish
between these two cases.
Reference GSM 07.07