diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d7808b5..85b96c32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,10 @@ will consitute of a breaking change warranting a new major release:
 
 # [unreleased]
 
+## Changed
+
+- SCEX filename updates. Also use T as the file ID / date separator between date and time.
+
 # [v1.41.0] 2023-03-28
 
 eive-tmtc: v2.20.0
diff --git a/mission/payload/ScexDeviceHandler.cpp b/mission/payload/ScexDeviceHandler.cpp
index 7ef070a9..2b3f69f7 100644
--- a/mission/payload/ScexDeviceHandler.cpp
+++ b/mission/payload/ScexDeviceHandler.cpp
@@ -205,7 +205,7 @@ ReturnValue_t ScexDeviceHandler::interpretDeviceReply(DeviceCommandId_t id, cons
   using namespace scex;
 
   ReturnValue_t status = OK;
-  auto oneFileHandler = [&](std::string cmdName) {
+  auto oneFileHandler = [&](const char* cmdName) {
     auto activeSd = sdcMan.getActiveSdCard();
     if (not activeSd) {
       return HasFileSystemIF::FILESYSTEM_INACTIVE;
@@ -216,7 +216,7 @@ ReturnValue_t ScexDeviceHandler::interpretDeviceReply(DeviceCommandId_t id, cons
     if (prefix == nullptr) {
       return returnvalue::FAILED;
     }
-    oss << prefix << "/scex/scex-" << cmdName << fileId << ".bin";
+    oss << prefix << "/scex/scex-" << cmdName << "-" << fileId << ".bin";
     fileName = oss.str();
     ofstream out(fileName, ofstream::binary);
     if (out.bad()) {
@@ -227,7 +227,7 @@ ReturnValue_t ScexDeviceHandler::interpretDeviceReply(DeviceCommandId_t id, cons
     out << helper;
     return OK;
   };
-  auto multiFileHandler = [&](std::string cmdName) {
+  auto multiFileHandler = [&](const char* cmdName) {
     if ((helper.getPacketCounter() == 1) or (not fileNameSet)) {
       auto activeSd = sdcMan.getActiveSdCard();
       if (not activeSd) {
@@ -264,31 +264,31 @@ ReturnValue_t ScexDeviceHandler::interpretDeviceReply(DeviceCommandId_t id, cons
   id = helper.getCmd();
   switch (id) {
     case (PING): {
-      status = oneFileHandler("ping_");
+      status = oneFileHandler(PING_IDLE_BASE_NAME);
       break;
     }
     case (ION_CMD): {
-      status = oneFileHandler("ion_");
+      status = oneFileHandler(ION_BASE_NAME);
       break;
     }
     case (TEMP_CMD): {
-      status = oneFileHandler("temp_");
+      status = oneFileHandler(TEMPERATURE_BASE_NAME);
       break;
     }
     case (EXP_STATUS_CMD): {
-      status = oneFileHandler("exp_status_");
+      status = oneFileHandler(EXP_STATUS_BASE_NAME);
       break;
     }
     case (FRAM): {
-      status = multiFileHandler("fram_");
+      status = multiFileHandler(FRAM_BASE_NAME);
       break;
     }
     case (ONE_CELL): {
-      status = multiFileHandler("one_cell_");
+      status = multiFileHandler(ONE_CELL_BASE_NAME);
       break;
     }
     case (ALL_CELLS_CMD): {
-      status = multiFileHandler("multi_cell_");
+      status = multiFileHandler(ALL_CELLS_BASE_NAME);
       break;
     }
     default:
@@ -362,9 +362,9 @@ std::string ScexDeviceHandler::date_time_string() {
   ostringstream oss(std::ostringstream::ate);
 
   if (tod.hour < 10) {
-    oss << tod.year << tod.month << tod.day << "_0" << tod.hour;
+    oss << tod.year << tod.month << tod.day << "T0" << tod.hour;
   } else {
-    oss << tod.year << tod.month << tod.day << "_" << tod.hour;
+    oss << tod.year << tod.month << tod.day << "T" << tod.hour;
   }
   if (tod.minute < 10) {
     oss << 0 << tod.minute;
diff --git a/mission/payload/ScexDeviceHandler.h b/mission/payload/ScexDeviceHandler.h
index 089a9005..8a8dcbd2 100644
--- a/mission/payload/ScexDeviceHandler.h
+++ b/mission/payload/ScexDeviceHandler.h
@@ -13,6 +13,14 @@ class SdCardMountedIF;
 
 class ScexDeviceHandler : public DeviceHandlerBase {
  public:
+  static constexpr char *FRAM_BASE_NAME = "framContent";
+  static constexpr char *ION_BASE_NAME = "ion";
+  static constexpr char *TEMPERATURE_BASE_NAME = "temperature";
+  static constexpr char *EXP_STATUS_BASE_NAME = "expStatus";
+  static constexpr char *ONE_CELL_BASE_NAME = "oneCell";
+  static constexpr char *ALL_CELLS_BASE_NAME = "allCells";
+  static constexpr char *PING_IDLE_BASE_NAME = "pingIdle";
+
   ScexDeviceHandler(object_id_t objectId, ScexUartReader &reader, CookieIF *cookie,
                     SdCardMountedIF &sdcMan);
   void setPowerSwitcher(PowerSwitchIF &powerSwitcher, power::Switch_t switchId);