diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 6c06879..bcd489c 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -127,6 +127,7 @@ static int acpi_battery_technology(struct acpi_battery *battery)
 		return POWER_SUPPLY_TECHNOLOGY_LION;
 	if (!strcasecmp("LiP", battery->type))
 		return POWER_SUPPLY_TECHNOLOGY_LIPO;
+printk(KERN_ERR PREFIX "unmatched technology '%s'\n", battery->type);
 	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 }