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(Click for frequent words.) 68 lithium ion batteries 65 Li ion batteries 64 Lithium ion 63 Lithium Ion batteries 62 NiMH batteries 62 lithium ion 62 rechargeable lithium ion batteries 62 Li Ion batteries 62 NiMH 61 Lithium ion battery 61 Lithium Ion Li Ion 60 lithium ion battery 59 battery chemistries 59 nickel metal hydride 59 Lithium polymer 58 nickel hydride batteries 58 Nickel Metal Hydride 58 NiCd 57 vanadium redox batteries 57 Ultracapacitors 56 potash lye 56 Saphion technology 56 SCiB 56 Nickel metal hydride 56 Lithium Ion Polymer 56 Li ion 56 disposable alkaline batteries 55 cathode materials 55 lithium batteries 55 Li Ion 55 rechargeable batteries 55 lithium ion rechargeable batteries 55 batteries 55 Rechargeable batteries 55 ultracapacitors 55 super capacitors 55 anode materials 54 SOFCs 54 Lithium batteries 54 battery packs 54 Li ion battery 54 NiCad batteries 54 lithium ion Li ion 54 Lithium Polymer batteries 54 ion batteries 54 Lithium ion Li ion 53 NiMH battery packs 53 HEV batteries 53 nanophosphate 53 Lithium Ion 53 NiMH battery 53 Li Ion battery 53 lithium polymer battery 53 metal hydride batteries 52 Li Polymer 52 NiMH nickel 52 nickel hydride 52 lithium battery 52 Nickel Cadmium 52 Lithium ion polymer 52 rechargeables 52 rechargeable lithium 52 rechargeable 52 lithium Ion 52 Ni MH 52 Lithium Ion Li ion 52 NiMH Rechargeable batteries 52 lithium rechargeable batteries 52 rechargeable nickel 52 NiZn 51 vanadium redox flow 51 li ion batteries 51 acid batteries 51 lithium ion polymer 51 HEVs 51 Saphion 51 Ni Cad 51 Supercapacitors 51 sodium sulfur 51 Ni MH batteries 51 lithium ion phosphate 51 Zinc Matrix 51 li ion battery 51 Lithium Polymer 51 Lithium ion rechargeable batteries 51 li ion 51 Lithium Ion battery 51 NiCad 50 DMFC 50 lithium polymer batteries 50 nickel cadmium 50 thermometers barometers dental amalgams 50 hybrid electric 50 lithium ion Li Ion 50 microbatteries 50 PEM fuel 50 Electric Vehicles EVs 50 lithium polymer 50 Wh kg 50 CFX Battery 50 PowerGenix 50 CR V3 50 NiMh 50 rechargeable Lithium ion 50 Rechargeables 50 Board AXPW 50 lithium vanadium 50 supercapacitors 50 liquid electrolytes 50 lithium cobalt oxide 49 Ni MH battery 49 Nickel Zinc 49 Direct Methanol Fuel Cells 49 lithium cobalt 49 polymer lithium ion 49 battery anodes 49 Valence Technology VLNC 49 Donald Sadoway 49 Mobion 49 carbon PbC 49 cold cathode fluorescent 49 rechargeable Lithium ion batteries 49 Lithium Iron Phosphate 49 lithium iron 49 ZPower 49 Fluorescent bulbs 49 ThinkPad notebook models 48 Ni Mh 48 Rechargeable Alkaline 48 battery charger ICs 48 e3 Supercell 48 maker A#Systems 48 miniSD cards 48 Z#m Z#e Z#m 48 lithium chemistries 48 Metal Hydride 48 See www.apple.com 48 LED backlights 48 EnerChip 48 Compact fluorescent bulbs 48 rechargeable polymer 48 lithium titanate battery 48 units EESU 48 ion battery 48 Lithium Ion SuperPolymer 48 supercapacitor 48 Alkaline batteries 48 NiMH cells 48 lithium ion rechargeable battery 48 Ni Cd batteries 48 Nanophosphate 48 ultra capacitors 48 EVs 48 LiFePO4 48 Cold Cathode Fluorescent Lamps 48 WiTricity 48 Dr. Christina Lampe 47 laminated lithium ion 47 internal combustion engines 47 methanol cartridges 47 super capacitor 47 rechargeable lithium batteries 47 iron phosphate 47 lithium phosphate 47 instantaneously recharged 47 Lithium Titanate 47 rechargable batteries 47 Elemental mercury 47 nickel cadmium battery 47 #v outlet 47 NiCd batteries 47 Lithium Polymer battery 47 swappable batteries 47 MRAMs 47 PowerGenix NiZn 47 Amprius 47 Lampe Onnerud 47 Rechargeable Alkaline batteries 47 proprietary Lithium Ion 47 NiCd battery 47 alkaline battery 46 cell Li Ion 46 Lithium ions 46 lithium titanate 46 CCFLs 46 Oxyride batteries 46 hybrid powertrains 46 alkaline NiMH 46 BEVs 46 Lithium ion Battery 46 ENER1 46 rechargeable battery 46 DMFCs 46 Nano Tube 46 nitride semiconductor 46 thermoelectric generators 46 Nasdaq EEEI 46 Lithium Ion Batteries 46 Ni Cd 46 PbC 46 Powerpacks 46 NiMH NiCd 46 Sakti3 46 Rechargeable Battery 46 Li ion polymer 46 Solicore Flexion 46 ThinkPad notebook computers 46 Panasonic Oxyride 46 ultracaps 46 PbC batteries 46 conventional internal combustion 46 eneloop batteries 46 Volt lithium ion 46 graphite anodes 46 alkaline batteries 46 ultra capacitor 46 dye sensitized cells 46 Lead Acid 46 nano titanate 46 metal hydride battery 46 cell SOFC 46 rechargeable lithium phosphate 46 Envia Systems 46 Buick LaCrosse Eco 46 rechargeable alkaline batteries 46 nuclear fission reactors 46 powerpacks 46 SuperPolymer R 46 rechargeable AAs 46 #Wh [002] 46 electric powertrain 46 fission reactors 46 sodium metal halide 46 Ultracapacitor 45 Q1P SSD 45 recharger 45 ThinkPad laptops 45 #mAh batteries 45 EESU 45 Lithium Ion Battery 45 #Ah 45 hydrides 45 hydrogen 45 thermoelectric materials 45 nonvolatile memory 45 replaceable lithium ion 45 Mobion TM 45 motors inverters 45 solar photovoltaic cells 45 Saft Li ion 45 NiMH AA 45 rechargeable AA 45 electrolysers 45 lithium phosphate battery 45 #.#V #mAh 45 Silicon Carbide 45 Saphion R 45 ReRAM 45 Nasdaq VLNC 45 recyclable plastics 45 Portege A# 45 R e2 45 #Whr 45 Batteries 45 Product Segment Nickel Cadmium 45 ZAFC 45 nanopowders 45 Energizer e2 Lithium 45 rechargeable lithium sulfur 45 Ener1 Inc 45 Lithium Ion SuperPolymer ® 45 Lithium Battery 45 flexible lithium polymer 45 PbC battery 45 hybrids diesels 45 GP Batteries 45 flywheel UPS 45 mAh Li Ion 45 Grätzel cells 45 lithium thionyl chloride 45 Cymbet EnerChip 45 vehicles EVs 45 rechargeable Ni MH 45 lithium manganese dioxide 45 electric hybrids 45 PureEnergy 45 Rechargeable Batteries 45 USBCELL 45 polymer electrolyte membrane 45 rechargeable lithium ion 45 crystalline silicon wafers 45 spintronic devices 45 removable lithium ion 45 DieHard Platinum 45 hydrogen fuel 45 rechargeable nickel cadmium 45 Ulrik Grape 45 automotive catalytic converters 45 Cell Li Ion 45 Inc. NPWZ 45 cell DMFC 45 PHEVs 45 capacitors 45 String Ribbon solar 45 myPower ALL Plus 45 polymer electrolyte fuel 45 magnetic ballasts 44 electric drivetrains 44 Propane autogas 44 Gallium Arsenide 44 Rechargeable 44 #mAH 44 VRBs 44 graphite anode 44 Z#p 44 inch iBook G4 44 Intel Atom processors 44 Inverters 44 hybrids plug ins 44 microdrives 44 EN EL# 44 rechargeable Nickel 44 fission reactor 44 Medis Technologies 44 lithium polymer cells 44 ultracapacitor 44 OLED displays 44 Hydrogen Fuel Cell 44 Gratzel cells 44 cathode 44 Gallium arsenide 44 backsheets 44 Compact fluorescents 44 rechargeable zinc 44 ActaCell 44 LI #B 44 NiMH rechargeable batteries 44 Induction cooktops 44 Borroni Bird 44 Fulton eCoupled technology 44 Lithium Phosphate 44 MLC NAND flash 44 GaN LEDs 44 superconducting magnetic 44 Subaru R1e 44 SLC NAND flash 44 mAh Li ion battery 44 rechargeable Lithium Ion 44 Silicon Carbide SiC 44 Amorphous silicon 44 THINERGY MECs 44 Furukawa Battery 44 Incandescent lamps 44 myPower ALL 44 PbC ® 44 Flexion ® 44 FeRAM 44 superconducting wire 44 SOI wafers 44 metal hydride 44 MicroSun Technologies 44 nickel hydroxide 44 crystalline silicon panels 44 Li ion rechargeable battery 44 dysprosium 44 electrolyzers 44 nonrechargeable 44 #kWh [002] 44 SOFC 44 CdTe solar 44 EFM# 44 Superlattice 44 Superlattice Power 44 electrolytic capacitors 44 Advanced Lithium 44 EnerChip CC 44 thermoelectrics 44 F4EG 44 transform CO2 emitted 44 #mAh [001] 44 Coal gasification 44 lithium manganese 44 batteries supercapacitors 44 microbattery 44 nanocatalysts 44 Evergreen Solar panels 44 VHESC 44 Fossil fuels 44 active matrix OLEDs 43 Hard disk drives 43 batteries ultracapacitors 43 reformed methanol 43 vehicles PHEVs 43 advanced Nanophosphate ™ 43 HEV EV 43 Light emitting diodes 43 recyclable paperboard 43 monocrystalline wafers 43 Bluetec diesel 43 NiMH battery pack 43 Potassium hydroxide 43 Thermoelectric 43 HFC #a 43 Solid Oxide Fuel Cell 43 Hydrogen Internal Combustion 43 borohydride 43 SiC 43 CdTe PV 43 zinc bromine 43 grade lithium carbonate 43 Acer Timeline 43 polymer electrolyte membrane PEM 43 #mAh [002] 43 #.#kWh 43 Rechargeable battery 43 OLEDS 43 Titanate 43 Aquafairy 43 standard alkalines 43 NAND flash 43 E'Jenie 43 U# Hybrid 43 Ionic liquids 43 ultramobile PCs 43 conventional combustion engines 43 magnesium alloys 43 PowerGate Plus 43 Hydrogen Fuel Fuel 43 Fluorescent lamps 43 rechargeable Li ion 43 Rechargeable Lithium 43 rechargeable NiMH batteries 43 bipolar transistors 43 renewable feedstocks 43 lithium phosphate batteries 43 phosphors 43 rechargeable Li Ion 43 lithium sulfur dioxide 43 Capstone microturbines 43 Flowing Electrolyte Direct Methanol 43 Nano Lithium 43 lithium titanate batteries 43 silicon transistors 43 charger adapters 43 Toyota RAV4 EV 43 Ultimate Lithium 43 proton exchange 43 Fuji Novel 43 PbC TM 43 solar chargers 43 PEMFC 43 notebook computers 43 Getac B# 43 Compaq Presario V# 43 Satellite T# 43 MRAM 43 Sanyo Eneloop 43 Biomass gasification 43 membrane electrode assemblies MEAs 43 Sunverge 43 crystalline silicon photovoltaic 43 #.#Ah 43 VRB ESS 43 millimeter silicon wafers 43 NiMH rechargeable battery 43 Remy electric motors 43 Quallion LLC 43 lamps CCFLs 43 battery recharges 43 cadmium sulphide 43 praseodymium 43 ceramic capacitors 43 HydroPak 43 metal hydrides 43 Copper Indium Gallium Selenide 43 passive matrix OLEDs 43 biomass fuels 43 Saturn Vue plug 43 nanobattery 43 bismuth telluride 43 electrically driven 42 liquid electrolyte 42 vehicles HEVs 42 super alloys 42 Nautiz X5 42 EnerSys ENS 42 FreedomCAR 42 Sanyo eneloop 42 Direct Methanol Fuel Cell 42 nickel cadmium batteries 42 Plug Power GenDrive 42 prismatic cells 42 Atom chips 42 battery 42 microturbines 42 GreenChip 42 fluorescent halogen 42 eStar truck 42 Lithium Polymer Battery 42 lithium manganese oxide 42 R# R#e T# T#p 42 #mAh Li Ion 42 FCVs 42 Hydrogen Storage 42 chargeable batteries 42 nanosystems 42 multijunction 42 CCFL LCD 42 Inc. NASDAQ EEEI 42 HEV battery 42 cells DMFCs 42 transparent conductive coatings 42 solar photovoltaics biofuels 42 membrane PEM fuel 42 MiEV 42 AMOLEDs 42 MLC SSDs 42 inverter charger 42 universal charger 42 LEDs 42 Inverter Charger 42 solar inverters 42 hydrogen powered 42 Cell microprocessor 42 Vehicles HEVs 42 XX# 42 rechargeable lithium battery 42 VRLA batteries 42 HCCI engines 42 monocrystalline silicon 42 NiZn batteries 42 CPV solar 42 lithium ion rechargeable 42 SolFocus CPV systems 42 produces anode 42 MEMS microelectromechanical systems 42 SMB# 42 electric powertrains 42 Microdrives 42 Innergie 42 chargers 42 OLED screens 42 graphite foam 42 battery powered 42 leaking potassium hydroxide 42 Quantum dots 42 solar photovoltaics 42 lamp CCFL 42 Rooftop solar panels 42 #kWh lithium ion battery 42 LiFePO4 batteries 42 R#a 42 Maxwell BOOSTCAP 42 LTPS TFT LCD 42 EV HEV 42 fossil fuels 42 linear fluorescent lamps 42 PV inverters 42 ICEs 42 Ultrastar #K# [002] 42 pigments electroplating 42 solar laminates 42 Solid Oxide Fuel Cells 42 Light Emitting Diodes LEDs 42 HDDs 42 magnetic bearings 42 Acriche 42 Ion battery 42 microinverters 42 Inductive Charger 42 multijunction solar cells 42 Compressed natural 42 High Brightness LEDs 42 Microturbine 42 superalloys 42 cadmium telluride CdTe 42 Tailpipe emissions 42 porous silicon 42 diodes OLEDs 42 Hybrids 42 Raman lasers 42 rechargers 42 HFO #yf 42 zinc bromide 42 Compact fluorescent lamps 42 ReliOn 42 LCDs liquid crystal 42 RRAM 42 fuel cells SOFCs 42 WirelessHD chipsets 42 Transit Connect BEV 42 magnesium phosphate 42 A#Systems 42 Internal combustion engines 42 DSSCs 42 micro inverters 42 xenon lamps 42 eneloop 42 electrocatalyst 42 cryogenically cooled 42 Schottky diodes 42 zero emission 42 ultraportable notebook 42 LCD backlights 42 Tekion 42 Energizer Ultimate 42 Wanxiang Electric 42 internal combustion 42 rechargable 42 HTS wire 42 #V #A 42 #V lithium ion [001] 42 hydrogen combustion engine 42 String Ribbon 42 Electro Energy 42 NiMh battery 42 OLEDs 42 chemical hydrides 42 polluting fossil fuels 42 Ford Focus BEV 42 Thermoelectrics 41 Mobion ® 41 EV PHEV 41 NAND memory 41 CCFL backlighting 41 Halogen lamps 41 solar cells 41 perfluorocarbons 41 photonic devices 41 molten carbonate 41 Ultrastar C#K# 41 #V lithium ion [002] 41 OptoCooler HV# 41 Smart NanoBattery 41 electric hybrid 41 Crystalline silicon 41 CIGS solar cells 41 volt lithium ion battery 41 Remy HVH 41 compressed hydrogen 41 Saturn Vue hybrid 41 EFOY Pro 41 MRAM chips 41 alkalines 41 LED MR# 41 CV# K# 41 carbon nanotubes CNT 41 Hydrogen 41 Rechargeable Li ion 41 Incandescent bulbs 41 inch HDDs 41 fluorescent backlights 41 tungsten filament 41 Axial Flux 41 mass producible hydrogen 41 Soljacic 41 #GB SSD [002] 41 battery chargers 41 Inc. NASDAQ VLNC 41 microelectronic devices 41 Premacy Hydrogen RE 41 membrane electrode assemblies 41 CIGS panels 41 Nanoexa 41 solar photovoltaic stationary 41 EPEAT Gold rated 41 Smart Nanobattery 41 notebook PCs 41 LED backlighting 41 #kWh battery 41 AXPW 41 crystalline Si 41 hafnium 41 SiliconDrive 41 photomultiplier tubes 41 PHEV 41 AA alkaline 41 aqueous electrolyte 41 hard disk drives 41 STT RAM 41 Dow Kokam 41 eTec Minit Charger 41 hybrids PHEVs 41 copper indium gallium selenide 41 Gallium Arsenide GaAs 41 rechargeable lithium ion battery 41 Rechargeable lithium ion batteries 41 crystalline silicon solar panels 41 film transistors TFTs 41 Compact fluorescent lights 41 rechargeable Lithium ion battery 41 nanomotors 41 Exide Technologies XIDE 41 MicroSun 41 microcell foam 41 ClearEdge Power 41 nonrenewable sources 41 vehicles BEVs 41 manganese dioxide 41 Molinaroli 41 bio diesels 41 k gate dielectrics 41 HTS cables 41 Bloom Boxes 41 cylindrical lithium ion 41 DSCs 41 dysprosium terbium 41 thermoelectric cooling 41 nano lithium titanate 41 VARTA 41 finite fossil fuels 41 HB LEDs 41 biodegradable plastics 41 subsidiary Direct Methanol 41 Light Emitting Diode 41 Minit Charger 41 Battery Packs 41 Energizer Lithium 41 Ovonic 41 BMW Concept ActiveE 41 Vaio notebook 41 opoc ® 41 iZAP 41 Superlattice Power Inc. 41 Sony Vaio TZ 41 Pellet stoves 41 membrane separator 41 LCDs 41 ditches spinouts dead 41 Li ion rechargeable batteries 41 electrolyte salts 41 AMOLED displays 41 GE WattStation 41 SSD drives 41 SLC NAND 41 hybrids 41 HFC refrigerants 41 ceramic substrate 41 LFTR 41 OLED Displays 41 Alex Molinaroli 41 quantum dot lasers 41 netbooks notebooks 41 Compact fluorescent 41 ThinkPad notebook PCs 41 tantalum capacitor 41 LiIon battery 41 ZESS 41 compact fluorescents 41 Dysprosium 41 internal combustion engine 41 replaceable batteries 41 silicon carbide SiC 41 lamps CCFL 41 milliwatts mW 41 cobalt oxide 41 Transphorm 41 LED emitter 41 AO#h 41 combustion engine 41 lithium sulfur 41 Anytone 41 Concentrating solar 41 Masatami Takimoto 41 5KW 41 battery rechargers 41 Matsushita Battery Industrial 41 solar concentrator systems 41 composite cathode 41 halogen bulbs 41 Nasdaq CBAK 41 silicon feedstock 41 CMOS sensors 41 8GB NAND flash 41 Traditional incandescent bulbs 41 PowerCube 41 Spec Shea 41 REEV 41 hydrogen fueling 41 liquefied hydrogen 41 inch PowerBooks 41 #V outlet 40 Highly Efficient 40 Integrated Gasification Combined Cycle 40 ferroelectrics 40 multicrystalline solar cells 40 CCFL backlight 40 MEMS sensor 40 BASF Catalysts division 40 Lithium ion Batteries 40 Alkaline Batteries 40 #mAh Li ion 40 mAH 40 #G byte SSDs 40 e3 Supercells 40 Cobasys 40 Ener1 40 HID lamps 40 TFPV 40 capacitor 40 polycrystalline silicon 40 Wind U# 40 Lishen Power Battery 40 superconductor cables 40 retool factories 40 prismatic battery 40 HydroGen 40 UltraBattery 40 Christina Lampe Onnerud 40 spintronic 40 EcoMotors 40 metal alloys 40 SCR Selective Catalytic Reduction 40 X# notebook 40 NewerTech NuPower 40 aluminum electrolytic capacitors 40 biomass biogas 40 circulator pumps 40 lithium 40 tantalum capacitors 40 zinc rechargeable 40 efficient powertrains 40 nonpolluting 40 backlights 40 Butanol 40 iMiEV 40 DMC LS# 40 SCiB battery 40 Cymbet 40 grid V2G 40 lamps CFLs 40 Direct FuelCell 40 IGCC plants 40 electrode assemblies 40 microdevices 40 StARS 40 HEV PHEV 40 ThinkCentre desktops 40 CIGS cells 40 removable rechargeable 40 iBook PowerBook 40 Board ENEI 40 petrodiesel 40 Powerstick 40 CdTe 40 LED bulbs 40 mAh 40 #Whr battery 40 electrowetting displays 40 GS Yuasa 40 Dynario 40 China Ritar 40 SB LiMotive 40 combustion engines 40 PZEVs 40 electric motors 40 AA alkaline batteries 40 GenDrive 40 SuperPolymer ® battery 40 inverter 40 transparent conductive electrodes 40 silane gas 40 NYSE Amex UQM 40 cadmium telluride 40 thermochemical processing 40 EVOLTA 40 amorphous silicon PV 40 Luxeon 40 CFBs 40 gaseous fuels 40 State Disk SSD 40 KH4 40 Hybrid Engine 40 kilowatt microturbine 40 amorphous silicon 40 LSE AIM PTX 40 Odyne plug 40 Tronix Explorer 40 Panasonic EV 40 electric drivetrain 40 gallium nitride 40 scramjet engines 40 rechargeable Lithium 40 recharging stations 40 PolyFuel 40 lighting ballasts 40 indium gallium phosphide 40 Lead Acid Batteries 40 swappable battery 40 Varistors 40 samarium cobalt magnets 40 ethanol butanol 40 CMOS silicon 40 Oxyride 40 ultraportable laptop 40 AS#T 40 butane cartridges 40 concentrating photovoltaics 40 TFTs 40 Ener1 HEV 40 Uni Solar Ovonic 40 Vehicle HEV 40 Lithium Ion rechargeable battery 40 Toda Kogyo 40 metal hydride Ni MH 40 Intel Atom processor 40 Ferroelectric 40 farads 40 Cruzer Profile 40 UTC Power 40 incandescent halogen 40 Nanodevices 40 multicrystalline silicon 40 Compact fluorescent light 40 #Wh [001] 40 inMotion speaker 40 DPFs 40 Tecra R# [001] 40 SKYACTIV G 40 Trabant nT 40 discrete transistors 40 LENR 40 Nasdaq ALTI 40 rechargeable electric 40 Energizer Energi To 40 Ioxus 40 AMOLED screens 40 rectifiers 40 lignocellulosic ethanol 40 Nanobattery 40 dimmable CFL bulb 40 VAIO notebooks 40 photoelectric 40 Cellulosic ethanol 40 Gerbrand Ceder 40 Solio Classic 40 Brominated flame retardants 40 Megacity Vehicle 40 bioplastic 40 SiC MOSFETs 40 R #A refrigerant 40 electric Chevrolet Volt 40 HydroGen Corporation 40 SiGNa Chemistry 40 firefighting foam 40 Capstone MicroTurbine 40 chemical hydride 40 LIBs 40 Power Integrations EcoSmart 40 DirectFET 40 VLP RDIMM 40 environmentally friendly refrigerants 40 Engines HICE 40 Terbium 40 Supply Equipment EVSE 40 cofiring 40 capacitive loads 40 memristors 40 rechargeable Polymer Lithium Ion 40 Micro USB connector 40 volt lithium polymer 40 SOI CMOS 40 Bioplastic 40 cleanest fossil 39 lanthanum neodymium 39 high temperature superconductors 39 UPS uninterruptible power 39 laminar batteries 39 HEV 39 volt sockets 39 Chevrolet Malibu hybrids 39 fluorescent lamp 39 indium tin oxide ITO 39 ethanols 39 D# D# D# D# 39 incandescent bulb 39 ML# HYBRID 39 Tinskey 39 Automotive Batteries 39 MTI Micro Mobion 39 light emitting diodes LED 39 Aspire Timeline #T 39 FCgen TM -# 39 Cathode Materials 39 fueled microturbine 39 FFVs 39 nitrogen oxides NOx emissions 39 nanometer NAND flash 39 battery maker Simplo 39 BYD Co 39 Volt 39 conductive polymers 39 terbium 39 light emitting diodes LEDs 39 DDR4 DRAM 39 piezoelectric materials 39 #mAh battery [002] 39 Kokam 39 tankless heaters