Choosing between two EcoFlow extra batteries is really a question about how much power you plan to store. The DELTA Pro Extra Battery is built for larger home backup and even commercial or electronics applications, while the DELTA 2 Extra Battery targets camping, RV, and everyday home backup. The two refurbished add-ons share LFP (LiFePO4) chemistry, a black finish, and a California Prop 65 notice, but their listed prices sit $887.50 apart. If you own a DELTA Pro, you need the bigger companion; if you own a DELTA 2, the smaller one is the natural fit.
Quick verdict: If capacity is king and you want the certified refurbished add-on with the widest application list, choose the EcoFlow DELTA Pro Extra Battery. If you'd rather keep the upgrade cost low and double a DELTA 2 for trips and backup duty, the EcoFlow DELTA 2 Extra Battery is the practical choice.
Listed prices and capacity at a glance
| Product | Listed Price | Price Bar | Extra Capacity | Charging Mode |
|---|---|---|---|---|
| EcoFlow DELTA Pro Generator Extra Battery 3600Wh LFP Certified Refurbished | $1,273.75 | 3600Wh | Connect to DELTA Pro | |
| EcoFlow DELTA 2 1024Wh Portable LFP Generator Extra Battery for RVs Refurbished | $386.25 | 1024Wh | MPPT (Maximum Power Point Tracking) |
Where each product wins
- EcoFlow DELTA Pro Extra Battery wins on capacity and scope: the largest extra storage of the pair, certified refurbished condition, and an application list that includes Blackout, Back-up Power, Camping/Hiking, Commercial, Electronics, Home/Garden, and RV. This is the add-on for heavier loads and longer outages.
- EcoFlow DELTA 2 Extra Battery wins on price and charging flexibility. It's the lower-priced option of the two and offers multiple ways to top up, including AC, car, solar, or a Smart Generator, with a fast 0-80% charge in 80 minutes.
EcoFlow DELTA Pro Generator Extra Battery 3600Wh LFP Certified Refurbished
This 3600Wh add-on expands a DELTA Pro from 3.6kWh to 7.2kWh of backup capacity, giving days of power for essential appliances. When connected, the extra battery charges and discharges in unison with the main unit, keeping the battery percent level across both. It supports all DELTA Pro charging methods, including 6500W MultiCharge, and an 1800W DC fast charge via the EcoFlow Smart Generator (sold separately) is available when other options run out. The trade-offs are the higher listed price and the fact that it's bound to the DELTA Pro system. If you're already invested in that platform and need serious storage, this is the stronger companion.
EcoFlow DELTA 2 1024Wh Portable LFP Generator Extra Battery for RVs Refurbished
The DELTA 2 Extra Battery adds 1024Wh to a DELTA 2, bringing total capacity to 2048Wh. It uses an LFP (LiFePO4) chemistry rated for 3000+ cycles with regular use, so it's built to last through years of camping and RV seasons. Charging options include AC outlets, car outlets, solar panels, and the Smart Generator, with a 0-80% charge time of 80 minutes. The catch: the Very Good Refurbished condition label means it works like new but may show larger scratches or dents and may be missing parts, accessories, or packaging. It's also capped at 2200W current output, so it's better suited to mid-draw loads than whole-home power. For the lower listed price, it's the easy choice if you run a DELTA 2.
Final choice by use case
- Home backup with larger loads or multi-day outages: the DELTA Pro Extra Battery's capacity headroom and commercial-capable application list make it the stronger match.
- Camping, RV trips, or modest home backup: the DELTA 2 Extra Battery's flexible inputs and lower listed price make it the sensible companion for a DELTA 2.
- Expansion on a tighter budget: the DELTA 2 add-on keeps the upfront investment down, while the DELTA Pro add-on asks for substantially more in exchange for a much larger capacity bump.
