Pentax K-BC50H Battery Charger Kit is suitable for use with the D-LI50 battery, as used in the K20D and K10D diigital cameras.
Price: £39.99 from Wex Photographic
The Pentax K-BC109 Battery Charger is for use with the D-LI109 Battery, as utilised in the K-50, K-500, K-30 and K-r cameras.
The Pentax D-BC90H is a spare or replacement battery charger for the Pentax D-LI90 battery as supplied with the Pentax K7, K5 DSLR and K-01 Interchangeable Lens Camera. It consists of the D-BC90 charging unit and a UK mains lead.