How I Evaluate Battery Storage Vendors: A 6-Step Procurement Checklist

Who This Checklist Is For

If you're sourcing battery storage for the first time—or replacing a vendor that didn't pan out—this is for you. I'm a procurement manager at a mid-size commercial developer. I've managed our energy storage budget ($340,000 annually) for six years, negotiated with 20+ vendors, and logged every order in our cost tracking system. I don't sell batteries, so nothing here is a pitch.

Six steps. You can run through the whole thing in about a week if you cut the noise. Each step has a checkpoint you can hand off to your team.

Step 1: Build Your Energy Profile Before You Talk to Anyone

Most people skip this. They call a vendor, get a quote, and then try to reverse-engineer whether it fits. Don't do that. Before you take a single call, answer three questions in writing:

• Peak demand and duty cycle—what's your highest load, and how often do you hit it?
• Energy storage efficiency target—what round-trip efficiency do you actually need? Most lithium systems land between 85% and 95% at the cell level, but full-system numbers run lower once you account for inverters and thermal management. Knowing your floor keeps you from overpaying.
• End-use requirements—if you're planning to pair storage with a home EV charger station or commercial charging infrastructure, that changes the discharge profile. Say so upfront.

Checkpoint: you have a one-page spec sheet you can send to vendors without adding commentary.

Everything I'd read said you should always get three quotes. In practice, when your spec is vague, three quotes just means three different interpretations of what you need. Fix the spec first, then compare.

Step 2: Verify the Vendor's Public Technical Record

Before you take a sales meeting, spend 20 minutes on the vendor's public technical pages—whether that's an LG Energy Solution official homepage, a competitor's spec library, or a distributor's datasheet portal. What you're looking for:

• Do they publish datasheets with actual numbers, or just marketing language?
• Is their manufacturing footprint disclosed? (Factory locations, capacity, certifications.)
• What's their published R&D pipeline? For instance, LG Energy Solution solid state battery research has been in public milestones for years—that signals whether they're investing in the next cycle or just selling the current one.

Checkpoint: you can name two specific things the vendor has published about their technology. If you can't, they're either too opaque or you're not looking hard enough.

Step 3: Run the Numbers on Total Cost, Not Unit Price

I keep a TCO spreadsheet that I've refined over six years. Every vendor quote goes into it. The columns that matter:

• Base unit price
• Shipping and handling
• Installation requirements (some systems need specialized labor—this can hit 15-25% of total)
• Rush fees, if you need it fast
• Maintenance and monitoring over five years
• Warranty terms—what's actually covered, not what's implied

In 2022, I almost signed a vendor whose unit price was 12% lower than the next option. Then I ran the TCO. Shipping was structured per-pallet, the warranty excluded thermal management components, and there was a three-year minimum service contract buried in the terms. Five-year total: 18% higher. That's the difference between a cheap quote and a cheap system.

Checkpoint: your TCO model shows the breakeven year for each vendor. If one vendor's breakeven is year 6 and your planning horizon is 5, that's a red flag.

Step 4: Check the Logistics and Storage Requirements

This is the step most procurement teams skip, and it's the one that bites you later.

If you're receiving LiFePO4 cells or modules, know how to store LiFePO4 batteries before the shipment arrives. That means:

• Temperature-controlled space (generally 15-25°C—check the spec sheet for your specific product)
• State of charge between 30-50% for extended storage
• No direct stacking without proper separation
• Fire suppression that meets local code—don't assume your existing sprinkler system qualifies

I've seen a project delayed three weeks because the receiving facility wasn't rated for the battery chemistry being shipped. That delay cost us $14,000 in extra storage fees and missed milestones.

Checkpoint: your receiving team has signed off on the storage conditions before the PO goes out.

Step 5: Pilot Small Before You Commit Big

Here's where I'll get on a soapbox for a second. The vendors who treated my $200 orders seriously when I was starting out are the same ones I still use for $20,000 orders. Small doesn't mean unimportant—it means potential.

If a vendor won't work with you on a pilot order, even a small one, that's a signal. Not always a deal-breaker, but a signal. A good supplier will treat a five-unit test order with the same attention as a 500-unit contract. Ask for a pilot. Frame it as risk reduction for both sides.

Checkpoint: you've run at least one real transaction through the vendor's system before signing a long-term agreement. You know their invoicing speed, their support responsiveness, and whether their shipping labels show up on time.

Step 6: Lock the Exit Terms

Nobody wants to talk about how this ends. You should anyway. Before you sign:

• What happens if the vendor discontinues your product line?
• Can you transfer the warranty to a new owner if you sell the asset?
• What's the lead time for replacement parts in year four?
• Is there a minimum purchase commitment, and what triggers penalties?

Checkpoint: you can answer all four questions without calling the vendor back. If you can't, you don't have an agreement—you have a hope.

Things That Trip People Up

A few patterns I've noticed across 20+ vendor evaluations:

• Confusing cell efficiency with system efficiency. The cell might do 95% round-trip, but the full system—with inverters, thermal management, and controls—might hit 82%. Always ask for system-level numbers.
• Ignoring the charging infrastructure question. If your project includes a home EV charger station or fleet charging, the battery discharge profile is different from a standard load-shifting setup. Tell the vendor upfront.
• Assuming LFP and NMC are interchangeable. They're not. LFP gives you cycle life and safety margins. NMC gives you energy density. Match the chemistry to the application, not the price sheet.
• Skipping the site visit. If the vendor won't send someone to look at your install site—or at least do a video walkthrough—you're buying a product, not a solution.

One last thing: this vendor landscape and pricing context was accurate as of Q1 2025. Battery pricing moves fast—especially with solid-state development ramping up—so verify current rates before you budget. What was true six months ago may not be true today.

Bottom line: the vendors who make this easy are the ones who've done it before. This checklist won't guarantee a perfect outcome, but it'll catch the mistakes that cost real money.