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To address the issue of batteries losing their ability to a hold a charge over time, some companies are making tweaks to the traditional lithium-ion battery. A leader in this field is Boston Power, a relatively new name on the technology scene that is making a big splash with its long-lasting Sonata batteries. Unlike standard batteries that lose much of their ability to hold a charge after a year (350 charges), the Sonata line is supposed to last 1,000 charges or 3 years.
HP is the first vendor to offer Sonata to its users, selling the batteries to its customers under the name HP Enviro as an upgrade for many of its dv, HDX, G series, and Compaq CQ Series notebooks. HP chose the “Enviro” name, because the battery’s like Compaq Presario V2000 battery (compaq v2000 battery ), Hp pavillion zx5000 battery (Hp zx5000 battery ), Hp PP2200 battery , Hp Pavilion dv2000 battery (Hp dv2000 battery ), Hp HSTNN-LB31 battery , Hp EV088AA battery 3-year lifespan means fewer replacement batteries purchased, and fewer batteries disposed of.
Because HP only began selling its Enviro batteries in the spring of 2009, no real-world user accounts exist to show whether the batteries really do last for more than 1,000 cycles as claimed. However, the company is putting its money where its specs are by warrantying the battery for a full three years, guaranteeing users that their packs will be replaced if they don’t last that long.
As part of our research for our recent article on battery myths, we spoke with Boston Power CEO Dr. Christina Lampe-Onnerud and HP Distinguished Technologist John Wozniak to ask them how the Sonata batteries achieve their longer lifespan.
Wozniak told us that, unlike typical notebook batteries that use cylindrical cells, the Sonata uses prismatic cells inside its battery pack. “What that form factor does is it allows [the cell] to swell a little bit and normally inside your cylindrical lithium ion cells, you have some micron levels of swelling and shrinking that are going on during charging and discharging. But there’s no room for it to go inside a cylinder and that leads to some capacity loss over time,” he said. “You can almost think of it as microscopic wear and tear. In a prismatic form factor, where the can is shaped so it can swell a tiny bit over time, it is friendlier to the electrodes. Boston power has leveraged that kind of mechanical shape as well as some chemistry tweaks to get that longer life.”
Lampe-Onnerud emphasized that the Sonata’s chemistry also plays a role in its longevity. “We actually took a systems approach. It’s not only the way you design the battery; it’s the chemistry and the fine-tuning of the chemistry so we have a new chemistry going into the battery. We have a cylindrical paradigm and we’re conquering it with a prismatic paradigm. Instead of using carbon steels that are very tough materials . . . we have deployed an aluminum can that basically allows for lighter weight in general, better heat dissipation and much more flexibility in the metal so it allows this battery to basically breathe when you exercise it.”
Is 1,000 charges an absolute limit or just an estimate? Lampe-Onnerud told us that, while the company only warranties its batteries for 3 years – which adds up to about 1,000 charge cycles – they’ve gotten even more longevity out of their cells in lab testing.
“A thousand cycles is basically our spec, but when we test this battery in a confined temperature range so you room temperature and no heat,” she said. “If you don’t forget your laptop in your trunk or you don’t take it outside in Arizona for a long time, you’ll get more than that. We actually have cells that are on test in our laboratory that last for 1,400 – 1,500 cycles which is unheard of in this industry.”