Tektronix TDS3BATB BATTERY PACK; CUSTOM, 14.4V,5.4AH,12 LI-ION 18650-SIZE CELLS,RECHARGEABLE LITHIUM-ION,INTERNAL CHARGE CONTROL & FUEL GAUGE & PROTECTION CIRCUITRY IN PLASTIC CASE,FOR TDS3000 SERIES, SAME AS TEK PN 146013900,SAFETY CONTROLLED