Page 1:Staying Mobile Longer
Page 2:The Contenders: Specifications
Page 3:Background: The Technical Stuff
Page 4:External Batteries: How Do They Work?
Page 5:Amstron MedXP 140 And 300
Page 6:Brunton Sustain And Impel
Page 7:Digipower Universal Notebook Battery (EBP-NB60)
Page 8:Electrovaya PowerPad 95 And 130
Page 9:Energizer XP8000 And XP18000
Page 10:Lenmar PPU916
Page 11:PowerTraveller PowerGorilla And MiniGorilla
Page 12:Tekkeon myPower ALL Plus MP3750, MP3450, MP3450i
Page 13:MikeGyver: The Mac Solution
Page 14:Test Setup
Page 15:Benchmark Results: Netbook Battery Life
Page 16:Benchmark Results: Notebook Battery Life
Page 17:Benchmark Results: Recharge
Page 18:Feature Checklist
Page 20:Final Words
Benchmark Results: Netbook Battery Life
We expected Amstron's MedXP 300 to lead the pack. Its sheer size suggests lots of battery life. But notice just how far ahead it scores.
Besides the obvious, we have a couple of surprises. Notice that Brunton's Sustain has an output rating of 60 Wh, but comes out ahead of the three ~100 Wh batteries: XP18000, PowerGorilla, and PPU916. This just goes to show that the manufacturer's stated capacity isn't the final word. Voltage and current levels the company uses to test also matter.
Our updated benchmark generates a platform average design power of 11.5 W for the Dell Inspiron Mini 10. We used this value to normalize the capacity of all the batteries tested.
Even though we normalized battery capacity, that doesn't take weight into account. We weighed all of the batteries and graphed capacity and minutes per pound. Similar to normalized battery capacity and battery life, our per-pound metric presents the same data using different units.
While our calculations include the weight of a battery's physical shell, the graph take us by surprise. Pound for pound, Energizer's XP18000 and XP8000 deliver the most battery life. Meanwhile, many of the solutions geared toward industrial use (and consequently employ more durable enclosures) fall to the bottom, including the PowerPad 95 and MedXP 140. Obviously, making a robust battery means using thick armor to protect the battery cells from damage.
The Energizer batteries are the stand-outs here. Compare them to Tekkeon's batteries, which do worse in battery life and have a poorer weight efficiency.
- Staying Mobile Longer
- The Contenders: Specifications
- Background: The Technical Stuff
- External Batteries: How Do They Work?
- Amstron MedXP 140 And 300
- Brunton Sustain And Impel
- Digipower Universal Notebook Battery (EBP-NB60)
- Electrovaya PowerPad 95 And 130
- Energizer XP8000 And XP18000
- Lenmar PPU916
- PowerTraveller PowerGorilla And MiniGorilla
- Tekkeon myPower ALL Plus MP3750, MP3450, MP3450i
- MikeGyver: The Mac Solution
- Test Setup
- Benchmark Results: Netbook Battery Life
- Benchmark Results: Notebook Battery Life
- Benchmark Results: Recharge
- Feature Checklist
- Final Words