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diff --git a/firmware/target/arm/rk27xx/ihifi2/powermgmt-ihifi770.c b/firmware/target/arm/rk27xx/ihifi2/powermgmt-ihifi770.c
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index 0000000000..b0ff4f5a7b
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+++ b/firmware/target/arm/rk27xx/ihifi2/powermgmt-ihifi770.c
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+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2016 by Roman Stolyarov
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "adc.h"
+#include "adc-target.h"
+#include "powermgmt.h"
+
+/* Battery voltage calculation and discharge/charge curves for the iHiFi 770
+
+ Battery voltage is calculated under the assumption that the adc full-scale
+ readout represents 3.00V and that the battery ADC channel is fed with
+ exactly half of the battery voltage (through a resistive divider).
+ Charge curve have not been calibrated yet.
+*/
+
+const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
+{
+ /* 5% */
+ 3500,
+};
+
+const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
+{
+ /* 0% */
+ 3300,
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
+const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
+{
+ { 3300, 3570, 3660, 3696, 3712, 3742, 3798, 3865, 3935, 4020, 4130 }
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
+const unsigned short percent_to_volt_charge[11] =
+ { 3300, 3570, 3660, 3696, 3712, 3742, 3798, 3865, 3935, 4020, 4130 };
+
+/* full-scale ADC readout (2^10) in millivolt */
+#define BATTERY_SCALE_FACTOR 6296
+
+/* Returns battery voltage from ADC [millivolts] */
+int _battery_voltage(void)
+{
+ return (adc_read(ADC_BATTERY) * BATTERY_SCALE_FACTOR) >> 10;
+}