If you've already decided you want a battery, the equipment specs are the easy part. The warranty is where the real differences show up, and manufacturers don't make it easy to compare. We pulled the actual warranty documents from all four manufacturers so you don't have to. Every figure below is quoted or summarized directly from the source, and every source is linked so you can check us.

Warranty terms verified as of September 2026. Manufacturers do revise these documents, so always confirm the current version at the linked source before making a decision.

Battery	Warranty Term	Labor Coverage	Shipping / Logistics	Capacity Guarantee	Source Document
Tesla Powerwall	10 years (25 years for the Solar Shutdown Device)	"Reasonable labor costs" reimbursed, but only when performed by a Tesla Certified Installer; no dollar figure published	Not addressed in the warranty document	70% retained capacity at year 10	Read Tesla's Powerwall Warranty
Enphase IQ Battery	Shorter of 10 years, 4,000 cycles, or 2.8 MWh of throughput per kWh of capacity	Not covered	Return shipping covered for valid claims; carrier damage and restocking fees are not	70% retained capacity within the warranty window	Read Enphase's Battery Warranty
EcoFlow OCEAN Pro	15 years on the battery, inverter, smart panel, and meter switch; only 1-2 years on the app monitor and 5 years on the EV charger	Labor and logistics both covered in full during the warranty period; no certified-installer tier required	Covered in full, but voided if the customer ships the unit back without EcoFlow's designated carrier	70% retained capacity at 15 years or 6,000 cycles, whichever comes first	Read EcoFlow's Warranty Policy
FranklinWH aPower	15 years on the aPower 2 and aPower S, 12 years on the aPower X, only 5 years on the aGate module	Covered; FranklinWH publishes exact reimbursement amounts for certified installers: $250 per site visit, $200 per replaced aPower unit, $150 per aGate or aHub, $50 per meter adapter controller	Shipping and transit damage explicitly not covered	Not stated in the warranty document	Read FranklinWH's Warranty

Notice that FranklinWH is the only manufacturer here willing to publish exact dollar amounts for labor reimbursement. That's not a small thing. It means their certified installers know precisely what they're getting paid before they show up, which affects whether a service call happens quickly or gets pushed to the back of the queue.

One more thing worth knowing about EcoFlow specifically: its OCEAN Pro system requires a Smart Electrical Panel, which is real electrical panel work, not just a battery drop-off. Got Watts started as an electrical company before it became a solar installer, so this kind of work stays in-house instead of being handed to a subcontractor. That matters more than it sounds like it should.

Warranty terms are only half the picture. Next up: how much storage each of these batteries actually gives you, and what happens to your home when the power goes out.