A few months ago i bought a third party CAMERON SINO 6600mAh battery. The battery life is outstanding and camera battery indicator displays a realistic value. One major setback though - i couldn't find an external charger thats compatible with this battery. I have a cheap branded dual slots and single slots charger, which could charge the original idx battery but not the Cameron Sino.

Hooking up the DC power to my LS300 to charge the 6600 now, no problem. But i still need a solution for an external economical charger <$100

dual slot charger
https://images-na.ssl-images-amazon.com/images/I/51d5VUhgpoL._SY300_.jpg

cameron sino battery
http://images.okazje.info.pl/p/sprzet-rtv/2250/cameron-sino-jvc-gy-hm200-ssl-jvc50-6600mah-48-84wh-li-ion-7-4v-cs-jhm600mx.jpg

I'm trying a Kastar JVC SSL-JVC70 7.4v 7800mAh 57.7Wh and Kastar charger that seems to work well and very inexpensive.

https://www.amazon.com/gp/product/B01J4MAKXG/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Though I think I would have preferred to get their other charger, though it seems to work well.. and battery lasts 400+ minutes as I remember. $75 for battery and charger.

these are the ones I bought- they work great. The charger also works well with the OEM provided battery:

https://www.amazon.com/gp/product/B0187WYF4E/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0129G6R5O/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I used to be really peeved at JVC for not including a charger like ALL other camera makers- but with all the free LS300 firmware upgrades, no complaints here anymore :)

Thanks for the reply Alex & Ed..

Alex.. How long does it take to fully charge a 57.7wh battery from empty?