Kastar CGA-DU21 Battery (4-Pack) and Charger Kit for Panasonic CGA-DU06, CGA-DU07, CGA-DU14, CGA-DU21, VW-VBD070 VBD140 VBD210 work with Panasonic NV-GS330, GS400, GS408, GS500, GS508, MX500, PV-GS90 - Newegg.com
Panasonic CGA-DU21 Replacement Camera Battery (For External Fit Only) | Battery Mart
CGA-DU21 Compatible Battery for Panasonic NV-GS17
Digital Replacement Li-ion Camera Battery Cga-Du21 for Panasonic Nv-GS330 Nv-GS400 Nv-GS408 Nv-GS500 - China Digital Battery and Digital Camcorder Battery price | Made-in-China.com