The M1000/M1200 Holux GPS chipsets (MTK something) are also low-power chipsets. The quite small M1200 with a MTK MT3318 chipset should last up to 23 hours according to specs (with the battery in the M1200. I don't know its capacity but the M1200 is only 67 × 23 × 16 mm so the battery is pretty small).

The Freedom keychain GPS'es are even smaller and must thus have a very small battery, apparently they last some 9-10 hours still. They use a SiRF star III chipset though. That MTK chipset in the M1200 is supposed to be one of the chipsets with the lowest power requirements. Don't know how it compares to the TI chipset, but as the TI one apparently is pretty bad for its main purpose (lock to GPS satellites) it doesn't really matter if its power consumption is low..