I was thinking of adding the B300 expansion battery next year. Only to find its discontinued. Leaving the B80 and the B210. However considering price and storage, I might as well just buy a AC180 (instead of the b80) or an AC180P (instead of the B210).
Are there options to use the replacement of the b300 to the AC70?
Absolutely correct, for around the same price, you get the 180 with the added inverter, AC & DC outlets, Wireless charger, UPS and App control. Use one to charge the other.
I have the AC70, 3 x AC180s and the AC200P, I use the 70 & 180s for home backup among other uses and keep the 200P as a spare battery bank and or bigger inverter.