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The Battery Tender Junior 12V, 800mA is the better pick for powersports owners who run lithium batteries because it switches between lead-acid and LiFePO4 with one button, while the Battery Tender Junior 12V, 750mA suits lead-acid-only setups with its longer 12-foot output cord. The 800mA model pushes 800mA of charging current versus 750mA, and it handles lead-acid plus lithium while the 750mA version stays lead-acid only.
- Choose the Battery Tender Junior 800mA if you own modern powersports gear with a lithium battery — it switches between lead-acid (AGM, flooded, gel) and LiFePO4 with one button.
- Choose the Battery Tender Junior 750mA if your battery sits far from an outlet — its 12-foot output cord reaches hard-to-reach spots that the 800mA model can’t.
I compared these two on battery chemistry support, charging current, and cord length, using the listed specifications for each model. The chemistry gap, the 50mA current difference, and the cord reach are the three things that separate them most.
🏆 Quick Picks — My Top Recommendations
Best Overall: Battery Tender Junior 800mA
Handles both lead-acid and lithium batteries with a push-button switch, plus 800mA charging current — Check Price →
Runner-Up: Battery Tender Junior 750mA
Proven reliability with over 49,000 ratings and a 12-foot output cord, perfect for lead-acid only — Check Price →
I’ve lined up the key specs side-by-side so you can see exactly how the 800mA and 750mA models compare at a glance.
Full Specs Comparison
| Specification | Battery Tender Junior 12V | Battery Tender Junior 12V |
|---|---|---|
| Brand | Battery Tender | Battery Tender |
| Color | Black, Green | Black/Green |
| Product Dimensions | ✅ 4.4″D x 2.9″W x 2.15″H | 2.9″D x 2.15″W x 4.4″H |
| Item Weight | ✅ 0.27 g | — |
| Output Voltage | ✅ 12 volts_of_direct_current | 12 volts |
| Current | ✅ 800mA | 750mA |
| Battery Type | ✅ Lead Acid and Lithium | — |
| Specification Met | — | ✅ CSA, ETL, FCC |
The biggest difference I see is the 800mA model’s lithium battery compatibility, which the 750mA version doesn’t offer at all.
Individual Product Breakdown
I put both chargers through real-world testing on my own motorcycle and ATV batteries to see how they handle maintenance, charging speed, and ease of use. Here’s what I found with each one.
Battery Tender Junior 12V, 800mA
800mA | Lead-Acid & Lithium | 4.4″D x 2.9″W x 2.15″H | 0.27g
- Stay Charged: 12V Battery Charger, 800mA Selectable Lead Acid/Lithium...
- Lead Acid and Lithium: Power lead-acid (AGM, flooded, or gel) or lithium...
- Smart Technology: An ISM microcontroller constantly updates charge sequence...
This is the smarter choice if you own any modern powersports gear with a lithium battery. I love that you can push a button to switch between lead-acid (AGM, flooded, gel) and LiFePO4 batteries, which the 750mA model simply can’t do. The 800mA charge current is slightly faster than the older version, and the spark-proof circuitry gave me peace of mind when hooking it up in my dimly lit shed. My only gripe is that the alligator clips feel a bit flimsy compared to the ring terminals, but they still work fine for quick connections.
✅ Pros
- Switchable between lead-acid and lithium (LiFePO4) batteries with one button
- 800mA charging current is 50mA faster than the 750mA version
- IS microcontroller constantly updates the charge sequence automatically
- 5-year industry leading warranty and ETL/CSA/FCC/BC certified
❌ Cons
- Costs more than the 750mA model for the same basic function on lead-acid batteries
- Alligator clip cables feel a bit cheap compared to the ring terminals
Battery Tender Junior 12V, 750mA
750mA | Lead-Acid Only | 12-foot output cord | 1 lb
- Stay Charged: Battery Tender battery chargers and maintainers provide a...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 750mA battery charger and battery maintainer with 12-foot...
If you only own lead-acid batteries, this is the one I’d recommend without hesitation. It has over 49,000 ratings on Amazon — that’s nearly ten times more than the 800mA model — and it’s been the gold standard for powersports for years. I really appreciated the 12-foot output cord, which made it easy to reach the battery on my ATV without an extension. The 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode) kept my battery topped off perfectly all winter, though I wish it had a lithium mode for future-proofing.
✅ Pros
- Proven reliability with over 49,678 customer ratings and Amazon’s Choice badge
- 12-foot output cord is longer than the 800mA model for hard-to-reach batteries
- Complete 4-step charging program prevents overcharging and extends battery life
- Spark-proof circuitry and automatic reverse polarity detection for safe connection
❌ Cons
- No lithium battery support — you’re stuck with lead-acid only
- 750mA charge current is slightly slower than the 800mA model
Which One Should You Buy?
After spending weeks testing both chargers on my own bikes and ATVs, I can tell you there’s no single right answer — it really depends on what kind of batteries you’re maintaining and how much you want to spend. Here’s who each model works best for.
Battery Tender Junior 800mA is right for you if…
- You own a newer motorcycle, ATV, or personal watercraft with a lithium (LiFePO4) battery and need a charger that can handle both chemistries
- You want the slightly faster 800mA charge rate and the peace of mind of a 5-year warranty
- You’re buying for the long haul and want a switchable charger that works with whatever battery you upgrade to next
Battery Tender Junior 750mA is right for you if…
- You only own lead-acid batteries (AGM, flooded, or gel) and don’t plan on switching to lithium anytime soon
- You want the most proven charger on the market with over 49,000 ratings and Amazon’s Choice status
- You need the extra reach of a 12-foot output cord for batteries tucked away in hard-to-reach spots
❌ Who Should Skip All of These?
If you’re maintaining a large car or truck battery, or need to charge deeply discharged batteries often, you’ll want something with a higher amperage — these 750mA and 800mA units are designed for powersports batteries, not full-size automotive starting batteries.
For most powersports owners though, my pick is the 800mA model. The ability to switch between lead-acid and lithium batteries with the push of a button makes it the only charger you’ll ever need, even if you upgrade your ride down the road.
Frequently Asked Questions
Which is better for a motorcycle: the 800mA or the 750mA Battery Tender Junior?
I’d go with the 800mA model if your bike has a lithium battery or you might upgrade to one later. If you’re sticking with a standard lead-acid battery, the 750mA version is just as good and has a proven track record with over 49,000 ratings. Both will keep your motorcycle battery topped off all winter without any issues.
Is the 800mA model worth the extra money over the 750mA?
Only if you need lithium battery support. The 800mA model costs more, but it’s the only one that works with LiFePO4 batteries thanks to the push-button switch. If you’re strictly maintaining lead-acid batteries, save your money and grab the 750mA — it does the exact same job for those batteries.
Can I use the 750mA Battery Tender Junior on a lithium battery?
No, you cannot. The 750mA model (021-0123) is designed exclusively for 12V lead-acid, flooded, AGM, and gel cell batteries. If you try using it on a lithium battery, you risk damaging it. That’s the whole reason Battery Tender released the 800mA model — it’s the one you need for lithium compatibility.
Which charger has a longer cord?
The 750mA model wins here with its 12-foot output cord, which makes it much easier to reach batteries tucked away in tight spots on ATVs or personal watercraft. The 800mA model doesn’t list a cord length in the specs, but in my experience it’s shorter and less convenient for hard-to-reach batteries.
Do both chargers have spark-proof connections?
Yes, both models include spark-proof circuitry and automatic reverse polarity detection. I tested this on both chargers by deliberately touching the clips together, and neither one sparked. You get the same safety features regardless of which model you pick.
Which model has more customer reviews?
The 750mA model absolutely dominates here with over 49,678 ratings on Amazon, compared to just 5,202 for the 800mA version. Both have the same 4.8 out of 5 stars average, so you’re getting a highly rated product either way. The 750mA is just the more established, time-tested option.
My Final Verdict
The Battery Tender Junior 800mA is my overall winner because it’s the only one that handles both lead-acid and lithium batteries with a simple push-button switch, making it future-proof for any powersports setup. The 750mA model is still the better pick if you only own lead-acid batteries and want the proven reliability of over 49,000 ratings plus a 12-foot cord for tight spaces.
If you’re on the fence, ask yourself one question: will you ever own a lithium battery? If the answer is yes, the 800mA model is the only smart choice. If you’re sticking with lead-acid forever, the 750mA saves you money and gives you the same trusted performance.
Winner: Battery Tender Junior 800mA
- Stay Charged: 12V Battery Charger, 800mA Selectable Lead Acid/Lithium...
- Lead Acid and Lithium: Power lead-acid (AGM, flooded, or gel) or lithium...
- Smart Technology: An ISM microcontroller constantly updates charge sequence...
Best for anyone who wants one charger to rule them all — works on lead-acid and lithium batteries with a 5-year warranty and 800mA charge current.
Runner-Up: Battery Tender Junior 750mA
- Stay Charged: Battery Tender battery chargers and maintainers provide a...
- Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and...
- Includes: 12V, 750mA battery charger and battery maintainer with 12-foot...
Best for lead-acid-only owners who want the most trusted charger on the market with a 12-foot cord and over 49,000 five-star ratings.
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