I am not sure. I purchased the NRG? for the Apollo and it had instructions for the Orbit, but I have seen the Orbit and the battery pack looks too large for that lantern, so perhaps that is a different part number and they used the same instruction booklet for both. There is a two-wire connector inside the battery compartment of the Apollo that is used to connect to the rechargable battery pack. Perhaps you can use the Orbit pack in the Apollo, but not visa versa? Sorry I cannot be more helpful.
Kate G Thank you for your input.