http://www.public.navy.mil/NAVSAFECEN/Documents/messages/ALSAFEs_prior/ALSAFE16-010.txt
"C. TEN OF 15 REPORTED INCIDENTS OCCURRED DUE TO IMPROPER STOWAGE OR TRANSPORT OF ENDS BATTERIES IN SERVICE MEMBER'S CLOTHING (POCKETS). INADVERTENT SHORTING OR DISCHARGE WHILE STOWED IN POCKETS TYPICALLY RESULTED IN THE IGNITION OF THE SERVICE MEMBER'S CLOTHING AND 1ST AND 2ND DEGREE BURNS ON THE LEGS AND TORSO."
And despite the following propaganda statement
"NOTE THAT THE CIVILIAN STUDIES INVOLVED FAILURES THAT RESULTED IN OPEN PRESS REPORTING (INJURIES WERE VERY SEVERE AND DREW PRESS ATTENTION)."
the Navy explained how battery incidents can be prevented.
"A. STOW YOUR BATTERIES IN A MANNER WHERE SHORTING THE BATTERIES IS IMPROBABLE. SILICONE/PLASTIC STORAGE CASES ARE COMMERCIALLY AVAILABLE TO MORE SAFELY STORE THESE BATTERIES. DO NOT STORE IN POCKETS WHERE THEY MAY COME INTO CONTACT WITH METAL OBJECTS
(TOOLS, COINS, KEYS, ETC.). DO NOT STORE IN YOUR LOCKER, BUNK, OR AUTOMOBILE WHERE SHORTING MAY BE POSSIBLE (UNRESTRAINED OR IN THE VICINITY OF METAL THAT COULD SHORT THE BATTERIES).
B. USE ONLY THE ORIGINAL CHARGER THAT WAS SUPPLIED WITH THE DEVICE. NOT ALL USB CHARGERS ARE CREATED EQUAL. FOR INSTANCE, USB OUTLETS VARY FROM 5-20V AND FROM 150MA-5A. CIVILIAN STUDIES REPORT OVERHEATING AND OVERCHARGING ARE RESPONSIBLE FOR THE MAJORITY OF ENDS BATTERY FAILURES. NOTE THAT THE CIVILIAN
STUDIES INVOLVED FAILURES THAT RESULTED IN OPEN PRESS REPORTING (INJURIES WERE VERY SEVERE AND DREW PRESS ATTENTION). WHEN CHARGING TAKE PRECAUTIONS TO ENSURE THE DEVICE IS WHERE IT CAN
BE MONITORED (MANNED SPACE) AND THERE ARE NO COMBUSTIBLES IN THE IMMEDIATE VICINITY (I.E. BUNKS/RAGS/CLOTHING).
C. BUY QUALITY EQUIPMENT FROM A REPUTABLE MANUFACTURER. MORE EXPENSIVE MODELS ARE DESIGNED WITH ENGINEERED SAFETY DEVICES
THAT MONITOR THE EQUIPMENT TO PREVENT OVERCHARGING AND OVERHEATING.
D. ALTHOUGH THERE IS PLENTY OF INFORMATION AVAILABLE ON THE INTERNET TO MODIFY THESE DEVICES THIS PRACTICE SHOULD BE AVOIDED. SEVERAL MODIFICATIONS INVALIDATE/BYPASS SAFETY
MECHANISMS MANUFACTURED INTO THESE DEVICES."