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The Contenders: Specifications

External Battery Roundup: Stay Away From The Wall Socket
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Need More Battery Life?Need More Battery Life?

We are listing the total capacity of the batteries here, but we want to point out this isn't always an apples-to-apples comparison. mAh is the SI abbreviation for milliampere-hour. This is a quick and dirty way to compare the relative energy stored in one battery to that of another. However, these comparisons are only useful if you are looking at same battery chemistry.

If you want to think of capacity as how much fuel the battery holds, like a tank of gas, then chemistry is the type of fuel. If you are comparing lithium-ion polymer to nickel-metal hydride batteries, you might as well be talking about diesel and gas-powered cars. Also, think of the huge energy difference between one pound of coal and one pound of uranium. So, the only real metric of a battery's utility is to measure how long it actually runs. In lieu of automobiles and miles per gallon, our benchmark lab tests notebooks and battery life.

BrandAmstarAmstarBruntonBruntonDigipower
ModelMedXP 140MedXP 300SustainImpelUniversal Laptop Battery
ChemistryLithium-Ion PrismaticLithium-Ion CylindricalLithium PolymerLithium PolymerLithium-Ion
Output Rating--60 Wh (19 V @ 3.2 Ah)60 Wh (19 V @ 3.2 Ah)-
Battery Rating----4400 mAh
Battery Capacity140 Wh
293.04 Wh (14.8 V @ 19.8 Ah)73 Wh146 Wh48.8 Wh (11.1 V @ 4.4 Ah)
LCDNYNNN
Battery GuageYYYYY
Output Cable Length6'6'34"34"30"
Output Voltages16, 2012, 16, 19, 2412, 16, 1912, 16, 1916, 19
Charger (Watts)90130383828
Charger Weight0.861.580.410.410.58
USB portsN1111
CasingAluminum & RubberABS PlasticRubberized plasticRubberized plasticAluminum & ABS plastic
Length
10.38"10.75"7.25"7.75"6.5"
Width8.63"7.38"6.75"3.75"3.25"
Height.56"1.63"1.13"1.13"1"
Weight (lbs)3.45.382.381.311.13
Warranty (years)6 months6 months111
Warranty on cells6 months6 months111
Warranty registrationNNNNN
BrandElectrovayaElectrovayaEnergizerEnergizerLenmar
ModelPowerPad 95PowerPad 130XP8000XP18000PPU916
ChemistrySuperPolymer Lithium-IonSuperPolymer Lithium-IonLithium PolymerLithium PolymerLithium Polymer
Output Rating--38 Wh (19 V @ 2.0 Ah)66.5 Wh (19 V @ 3.5 Ah)-
Battery Rating--8000 mAh18 000 mAh-
Battery Capacity95 Wh (15 V @ 6.3 Ah)130 Wh (15 V @ 8.6 Ah)--104.5 Wh (19 V @ 5.5 Ah)
LCDLCMLCMNNN
Battery GuageYYYYY
Output Cable Length27"27"26.5" (9 V-12 V), 26.5" (16 V-20 V)26.5" (9 V-12 V), 26.5" (16 V-20 V)29.5"
Output Voltages15, 16, 18, 18, 19, 20, 2415, 16, 18, 18, 19, 20, 249-12, 16-209-12, 16-2016, 19
Charger (Watts)--6065-
Charger Weight--0.720.65-
USB ports22111
CasingABS plasticABS plasticABS plasticABS plasticAluminum
Length10.63"10.63"4.38"7.13"7.25"
Width8.25"8.25"2.88"4.88"4.94"
Height.69".69".94".81".56"
Weight (lbs)2.022.380.491.111.15
Warranty (years)11331
Warranty on cells116 months6 months1
Warranty registrationNNRequiredRequiredN
BrandPowerTravellerPowerTravellerTekkeonTekkeonTekkeon
ModelMiniGorillaPowerGorillaMP3750MP3450MP3450i
ChemistryLithium PolymerLithium PolymerLithium PolymerLithium PolymerLithium Polymer
Output Rating38 Wh (19 V @ 2.0 Ah)104.5 Wh (19 V @ 5.5 Ah)49.4 Wh (19 V @ 2.6 Ah)49.4 Wh (19 V @ 2.6 Ah)57 Wh (19 V @ 3.0 Ah)
Battery Rating9000 mAh21 000 mAh---
Battery Capacity-----
LCDYYNNN
Battery GuageYYYYY
Output Cable Length32"32"26"26"26"
Output Voltages8.4, 9.5, 10.5, 12, 198.4, 9.5, 12, 16, 19, 2410, 12, 14, 16, 18, 195, 6, 7.5, 9, 12, 14, 16, 195, 5.5, 6, 6.5, 7.5, 8.4, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19
Charger (Watts)1237-6060
Charger Weight0.250.34-0.870.86
USB ports11111
CasingRubberized ABS PlasticAluminum & RubberABS plasticABS plasticABS plastic
Length5.94"8.5"6.88"6.88"6.88"
Width3.25"5.25"3.31"3.31"3.31"
Height.63".69".94".94".94"
Weight (lbs)0.591.430.930.940.95
Warranty (years)11111
Warranty on cells11111
Warranty registrationRequiredRequiredRequiredRequiredRequired
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