Thanks for the additional information Muggs.
These carts are all nearly a year old, so I suspect old batteries is causing the cartridge errors you're experiencing. I'll have fresh batteries shipped to you.
Instructions for replacing chip batteries can be found here: http://www.inkjetmall.com/wordpress/product-use/r3000-cartridge-batteries/
Yes, our new chips don't use batteries, which is great to avoid dealing with dead batteries, and needing to replace them. I personally prefer the battery chips, because they can be manually reset, which is helpful when refilling carts before they're "empty". The new battery-less chips can not be manually reset, and only reset automatically when the chip reads empty in the printer, cart is removed, refilled with ink, and upon reinstallation, the chip is reset to read full again. We're using the remainder of battery chips before transitioning to the new style chips.
Please let me know if you have questions or there's anything else I can help you with.
Best regards~ Dana