Boston-Power is going to Asia to mass-produce its high-performance lithium-ion batteries.

The Westborough, Mass.-based battery maker on Tuesday named Hong Kong-based GP Batteries as a “strategic partner� to expand production of its Sonata rechargeable batteries, which are to be used in select Hewlett Packard notebooks (see HP Adopts Green Batteries for Notebooks, With More to Come).

Under the five-year agreement announced Tuesday, GP Batteries will dedicate a lithium-ion battery factory in Taiwan exclusively to making Sonata batteries. That factory is expected to double its 2008 monthly production this year, Boston-Power announced.

Terms of the deal with GP Batteries, and projected production rates from the Taiwan factory, weren’t disclosed. But Boston-Power did say that HP plans to deliver Sonata batteries to customers in the first quarter of this year.

The news comes on the heels of a $55 million investment Boston Power landed last month, bringing its total take to $125 million since its 2005 founding. Investors included Foundation Asset Management, Oak Investment Partners, Venrock, GGV Capital and Gabriel Venture Partners (see Boston-Power Gets $55M More to Produce Lithium-Ion Batteries).

CEO Christina Lampe-Onnerud told Greentech Media last month that Boston-Power was able to produce about 300,000 batteries per month, but wanted to reach “multiple millions per month� production in the near future.

Boston-Power is hoping to land another deal with a notebook vendor this year, and is working with HP on putting its batteries in other portable devices.

Its Sonata batteries can go through 1,000 charging cycles before losing their capacity to hold power, which is about three times more than conventional lithium-ion batteries.