The Watson D-LI109 Lithium-Ion Battery Pack works with the same cameras as the Pentax D-LI109. This replacement battery pack features a capacity of 1050mAh, 7.4V of output power, and 7.7 watt hours. Small and lightweight, lithium-ion batteries can be charged or discharged at any time without developing memory effects.
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After 2 years of moderate use, these Watson batteries still charge just fine, but they have "swelled" so much that they unusable in my Pentax KF. The "real" Pentax D-LI109 batteries I bought around the same time still fit (and charge up) just fine.
This Is A Very Good Backup Battery For Your Camera. Recommend That You Use The Pentax Battery Charger NOT The Watson Fast Charger For A Longer Life.