{HEAD ~ A device} for testing a battery, particularly a small, portable battery, comprising {TAIL ~ a flexible, transparent substrate} on which is deposited a narrow band of a black light absorbing material 
{ HEAD ~ A device } for testing a battery , particularly a small , portable battery , comprising { TAIL ~ a flexible , transparent substrate } on which is deposited a narrow band of a black light absorbing material
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH