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Before you buy new batteries, check one thing first: corroded contacts, not dead batteries, cause most solar light failures. Clean the terminals with a bit of vinegar and a wire brush, and a “dead” light often comes right back.
If it’s genuinely the batteries, here’s what to actually buy — and it comes down to one simple choice: AA or AAA.
| Battery | Size | Best For |
|---|---|---|
| Tenergy Solla AA 1000mAh | AA | Most solar garden and pathway lights |
| Tenergy Solla AAA 600mAh | AAA | Smaller lights and compact fixtures |
NiMH vs. NiCd vs. Alkaline: Only One Is Right for This
Solar lights need rechargeable batteries, which rules out alkaline immediately — those aren’t designed for daily charge cycles and will fail fast or leak.
Between the two rechargeable options, NiMH beats older NiCd batteries on every count that matters here: no toxic cadmium, less “memory effect” degradation, and typically a longer real-world lifespan — Tenergy’s NiMH line is rated around 5 years versus roughly 2 for NiCd.
Matching Capacity to Your Light
Check what’s currently installed before buying — the size (AA or AAA) and voltage (almost always 1.2V) need to match exactly.
Capacity (mAh) is more forgiving: a higher mAh than your original battery is always fine and just means more runtime, but going lower can leave your lights dimmer or shorter-lived than they should be.
Before You Blame the Battery
New batteries won’t fix a dirty solar panel — dust, pollen, and water spots block enough light to leave even fresh batteries undercharged.
Wipe the panel down with a damp cloth every month or two, especially before assuming a battery has failed. It’s the single most common reason “new batteries didn’t fix it.”
If lights work the first night after a battery swap but fade quickly after, that’s usually a charging problem, not a battery problem — check the panel before buying a second round of batteries.
Our Picks
Tenergy Solla AA 1000mAh — Most Common Fit
AA is the size most solar garden and pathway lights actually use, and Tenergy’s Solla line is specifically engineered against the two failure modes that kill cheaper batteries: leaking from overcharging on long sunny days, and dying from over-discharging during a stretch of cloudy weather.
Rated for 2,000 charge cycles and up to 5 years of use, UL certified, and shipped pre-charged so they work the moment you install them.
Full details and current price: Tenergy Solla AA 1000mAh on Amazon
Tenergy Solla AAA 600mAh — For Smaller Lights
Same Solla technology, sized for the smaller fixtures and compact lanterns that take AAA cells instead — string lights, small path markers, and similar low-profile lights.
Same 2,000-cycle rating and 5-year lifespan claim as the AA version, just in the smaller form factor your light actually needs.
Full details and current price: Tenergy Solla AAA 600mAh on Amazon
Frequently Asked Questions
My solar lights stopped working — is it definitely the battery?
Not necessarily. Corroded contacts are a more common cause than a dead battery — clean the terminals with vinegar and a wire brush before replacing anything.
Can I use a higher mAh battery than what came with my light?
Yes, a higher mAh is always safe and just means more runtime — going lower than the original is what can cause issues.
Are NiMH batteries better than NiCd for solar lights?
Yes — NiMH lasts longer, avoids the toxic cadmium in NiCd, and holds up better against the daily charge cycles solar lights require.
How long do rechargeable solar light batteries actually last?
Quality NiMH batteries like Tenergy’s Solla line are rated for around 2,000 charge cycles, translating to roughly 5 years of typical use.
Do these batteries come pre-charged?
Yes, quality solar light batteries ship pre-charged and ready to install right out of the pack.
Final Verdict
| Battery | Best For |
|---|---|
| Tenergy Solla AA 1000mAh | The size most solar garden and pathway lights use |
| Tenergy Solla AAA 600mAh | Smaller fixtures and compact string lights |
Check your old battery’s size before ordering — that single detail matters more than any brand or capacity comparison.