diff --git a/apps/lang/english.lang b/apps/lang/english.lang
index 795bde69f8..6ef4d40390 100644
--- a/apps/lang/english.lang
+++ b/apps/lang/english.lang
@@ -2925,3 +2925,21 @@ desc: ID3 virtual folder name
 eng: "Found %d matches"
 voice: ""
 new:
+
+id: LANG_BATTERY_TYPE
+desc: in battery settings
+eng: "Battery type"
+voice: "Battery type"
+new:
+
+id: LANG_BATTERY_TYPE_ALKALINE
+desc: in battery settings
+eng: "Alkaline"
+voice: "Alkaline"
+new:
+
+id: LANG_BATTERY_TYPE_NIMH
+desc: in battery settings
+eng: "NiMH"
+voice: "Nickel metal hydride"
+new:
diff --git a/apps/settings.c b/apps/settings.c
index de4254edad..e16d546bb6 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -235,6 +235,10 @@ static const struct bit_entry rtc_bits[] =
     /* new stuff to be added here */
     /* If values are just added to the end, no need to bump the version. */
 
+#if BATTERY_TYPES_COUNT > 1
+    {1, S_O(battery_type), 0, "battery type", "alkaline,nimh" },
+#endif
+
     /* Current sum of bits: 259 (worst case) */
     /* Sum of all bit sizes must not grow beyond 288! */
 };
@@ -759,6 +763,9 @@ void settings_apply(void)
 #endif
 
     set_battery_capacity(global_settings.battery_capacity);
+#if BATTERY_TYPES_COUNT > 1
+    set_battery_type(global_settings.battery_type);
+#endif
 
 #ifdef HAVE_LCD_BITMAP
     lcd_set_invert_display(global_settings.invert);
diff --git a/apps/settings.h b/apps/settings.h
index b28f4cedea..8a12b2623c 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -185,6 +185,7 @@ struct user_settings
     bool discharge; /* maintain charge of at least: false = 85%, true = 10%  */
     bool trickle_charge; /* do trickle charging: 0=off, 1=on */
     int battery_capacity; /* in mAh */
+    int battery_type;  /* for units which can take multiple types (Ondio). */
 
     /* resume settings */
 
diff --git a/apps/settings_menu.c b/apps/settings_menu.c
index 63f1415af8..b19f2eda3c 100644
--- a/apps/settings_menu.c
+++ b/apps/settings_menu.c
@@ -707,6 +707,19 @@ static bool battery_capacity(void)
                    &set_battery_capacity, 50, BATTERY_CAPACITY_MIN,
                    BATTERY_CAPACITY_MAX );
 }
+
+#if BATTERY_TYPES_COUNT > 1
+static bool battery_type(void)
+{
+    static const struct opt_items names[] = {
+        { STR(LANG_BATTERY_TYPE_ALKALINE) },
+        { STR(LANG_BATTERY_TYPE_NIMH) }
+    };
+
+    return set_option(str(LANG_BATTERY_TYPE), &global_settings.battery_type,
+                      INT, names, 2, set_battery_type);
+}
+#endif
 #endif
 
 #ifdef HAVE_CHARGE_CTRL
@@ -1250,6 +1263,9 @@ static bool battery_settings_menu(void)
 #endif
 #ifndef SIMULATOR
         { ID2P(LANG_BATTERY_CAPACITY), battery_capacity },
+#if BATTERY_TYPES_COUNT > 1
+        { ID2P(LANG_BATTERY_TYPE),     battery_type },
+#endif
 #else
 #ifndef HAVE_CHARGE_CTRL
         { "Dummy", NULL }, /* to have an entry at all, in the simulator */
diff --git a/firmware/export/config-ondiofm.h b/firmware/export/config-ondiofm.h
index 99d4c483ea..79e7adbe58 100644
--- a/firmware/export/config-ondiofm.h
+++ b/firmware/export/config-ondiofm.h
@@ -26,7 +26,7 @@
 #define CONFIG_I2C I2C_ONDIO
 
 /* Type of mobile power */
-#define CONFIG_BATTERY BATT_3AAA_ALKALINE
+#define CONFIG_BATTERY BATT_3AAA
 
 /* Battery scale factor (average from 3 Ondios) */
 #define BATTERY_SCALE_FACTOR 4735
diff --git a/firmware/export/config-ondiosp.h b/firmware/export/config-ondiosp.h
index 41bc83bf60..bda078a792 100644
--- a/firmware/export/config-ondiosp.h
+++ b/firmware/export/config-ondiosp.h
@@ -20,7 +20,7 @@
 #define CPU_FREQ      12000000
 
 /* Type of mobile power */
-#define CONFIG_BATTERY BATT_3AAA_ALKALINE
+#define CONFIG_BATTERY BATT_3AAA
 
 /* Battery scale factor (average from 3 Ondios) */
 #define BATTERY_SCALE_FACTOR 4735
diff --git a/firmware/export/config.h b/firmware/export/config.h
index 4a55fbc622..64694af794 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -45,9 +45,9 @@
 #define GMINI100_PAD    4
 
 /* CONFIG_BATTERY */
-#define BATT_LIION2200      2200 /* FM/V2 recorder type */
-#define BATT_4AA_NIMH       1500
-#define BATT_3AAA_ALKALINE  1000
+#define BATT_LIION2200  2200 /* FM/V2 recorder type */
+#define BATT_4AA_NIMH   1500
+#define BATT_3AAA       1000 /* Ondio */
 
 /* CONFIG_LCD */
 #define LCD_GMINI100 0
diff --git a/firmware/export/powermgmt.h b/firmware/export/powermgmt.h
index 2847156f46..ce006e9145 100644
--- a/firmware/export/powermgmt.h
+++ b/firmware/export/powermgmt.h
@@ -26,13 +26,15 @@
 #define BATTERY_LEVEL_FULL       400 /* 4.00V */
 #define BATTERY_CAPACITY_MIN 2200
 #define BATTERY_CAPACITY_MAX 3200 /* max. capacity selectable in settings */
-#elif CONFIG_BATTERY == BATT_3AAA_ALKALINE /* Ondio, Alkalines */
+#define BATTERY_TYPES_COUNT      1
+#elif CONFIG_BATTERY == BATT_3AAA /* Ondio */
 #define BATTERY_LEVEL_SHUTDOWN   260 /* 2.60V */
 #define BATTERY_LEVEL_EMPTY      270 /* 2.70V */
 #define BATTERY_LEVEL_DANGEROUS  280 /* 2.80V */
-#define BATTERY_LEVEL_FULL       450 /* 4.50V */
+#define BATTERY_LEVEL_FULL       475 /* 4.75V */
 #define BATTERY_CAPACITY_MIN 500
 #define BATTERY_CAPACITY_MAX 1500 /* max. capacity selectable in settings */
+#define BATTERY_TYPES_COUNT      2   /* Alkalines or NiMH */
 #else /* Recorder, NiMH */
 #define BATTERY_LEVEL_SHUTDOWN   450 /* 4.50V */
 #define BATTERY_LEVEL_EMPTY      465 /* 4.65V */
@@ -40,6 +42,7 @@
 #define BATTERY_LEVEL_FULL       585 /* 5.85V */
 #define BATTERY_CAPACITY_MIN 1500
 #define BATTERY_CAPACITY_MAX 3200 /* max. capacity selectable in settings */
+#define BATTERY_TYPES_COUNT      1
 #endif
 
 #define BATTERY_RANGE (BATTERY_LEVEL_FULL - BATTERY_LEVEL_EMPTY)
@@ -111,6 +114,7 @@ bool battery_level_safe(void);
 
 void set_poweroff_timeout(int timeout);
 void set_battery_capacity(int capacity); /* set local battery capacity value */
+void set_battery_type(int type); /* set local battery type */
 
 void set_sleep_timer(int seconds);
 int get_sleep_timer(void);
diff --git a/firmware/powermgmt.c b/firmware/powermgmt.c
index 26759b647d..08f0be7d5f 100644
--- a/firmware/powermgmt.c
+++ b/firmware/powermgmt.c
@@ -89,20 +89,21 @@ static const int poweroff_idle_timeout_value[15] =
     0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60
 };
 
-static const int percent_to_volt_decharge[11] =
+static const short percent_to_volt_decharge[BATTERY_TYPES_COUNT][11] =
 /* voltages (centivolt) of 0%, 10%, ... 100% when charging disabled */
 {
 #if CONFIG_BATTERY == BATT_LIION2200
     /* measured values */
-    260, 285, 295, 303, 311, 320, 330, 345, 360, 380, 400
-#elif CONFIG_BATTERY == BATT_3AAA_ALKALINE
-    /* taken from a textbook alkaline discharge graph, not measured */
-    270, 303, 324, 336, 348, 357, 366, 378, 390, 408, 450
+    { 260, 285, 295, 303, 311, 320, 330, 345, 360, 380, 400 }
+#elif CONFIG_BATTERY == BATT_3AAA
+    /* measured values */
+    { 280, 325, 341, 353, 364, 374, 385, 395, 409, 427, 475 }, /* alkaline */
+    { 310, 355, 363, 369, 372, 374, 376, 378, 380, 386, 405 }  /* NiMH */
 #else /* NiMH */
     /* original values were taken directly after charging, but it should show
        100% after turning off the device for some hours, too */
-    450, 481, 491, 497, 503, 507, 512, 514, 517, 525, 540 /* orig. values:
-                                                             ...,528,560 */
+    { 450, 481, 491, 497, 503, 507, 512, 514, 517, 525, 540 } 
+                                            /* orig. values: ...,528,560 */
 #endif
 };
 
@@ -115,6 +116,16 @@ void set_battery_capacity(int capacity)
         battery_capacity = BATTERY_CAPACITY_MIN;
 }
 
+#if BATTERY_TYPES_COUNT > 1
+static int battery_type = 0;
+
+void set_battery_type(int type)
+{
+    battery_type = type;
+    battery_level_cached = -1; /* reset on type change */
+}
+#endif
+
 #if defined(HAVE_CHARGE_CTRL) || CONFIG_BATTERY == BATT_LIION2200
 int charge_state = 0;                          /* at the beginning, the
                                                   charger does nothing */
@@ -136,7 +147,7 @@ int trickle_sec = 0;                           /* how many seconds should the
                                                   charger be enabled per
                                                   minute for trickle
                                                   charging? */
-static const int percent_to_volt_charge[11] = 
+static const short percent_to_volt_charge[11] =
 /* voltages (centivolt) of 0%, 10%, ... 100% when charging enabled */
 {
     /* values guessed, see
@@ -170,7 +181,7 @@ int battery_time(void)
 
 /* look into the percent_to_volt_* table and get a realistic battery level
        percentage */
-int voltage_to_percent(int voltage, const int* table)
+int voltage_to_percent(int voltage, const short* table)
 {
     if (voltage <= table[0])
         return 0;
@@ -195,6 +206,9 @@ void battery_level_update(void)
     int level = 0;
     int c = 0;
     int i;
+#if BATTERY_TYPES_COUNT == 1 /* single type */
+    const int battery_type = 0;
+#endif
     
     /* calculate maximum over last 3 minutes (skip empty samples) */
     for (i = 0; i < 3; i++)
@@ -214,7 +228,8 @@ void battery_level_update(void)
 
 #ifdef HAVE_CHARGE_CTRL
     if (charge_state == 0) { /* decharge */
-        level = voltage_to_percent(level, percent_to_volt_decharge);
+        level = voltage_to_percent(level, 
+                percent_to_volt_decharge[battery_type]);
     }
     else if (charge_state == 1) { /* charge */
         level = voltage_to_percent(level, percent_to_volt_charge);
@@ -223,7 +238,8 @@ void battery_level_update(void)
         battery_level_cached = level = 100;
     }
 #else
-    level = voltage_to_percent(level, percent_to_volt_decharge);
+    level = voltage_to_percent(level,
+            percent_to_volt_decharge[battery_type]);
     /* always use the decharge table */
 #endif