The is the Rechargeable Lithium-Ion Battery D-Li109 from Pentax for their KR digital SLR camera. Small and lightweight, Lithium-ion batteries can be charged or discharged at any time without developing memory effects.
Use With D-BC109 Charger
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2.2 x 1.4 x 0.6" (56.6 x 36.1 x 14.4mm)
2 oz (57g)
Pentax Rechargeable Li-Ion Battery D-Li109 for The KR Digital SLR Camera Review