Acoucou YTX9 BS YTX9A-BS Motorcycle Battery, YTX9-BS12V 4.25Ah Sodium-Ion Battery, 250CCA, For Motorcycles, ATV, Lawn Mowers, Tractors
Condition: New
Buy Now, Pay Later
As low as
$9
/ mo
Learn more
- – 4-month term
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 10 left in stock, order soon!
Arrives
Wednesday, Sep 24
Recently Viewed
Features
- High-Performance Sodium-Ion: New sodium-ion tech, our Powersports Battery YTX9 delivers 200 amps for motorcycle starts, 3000+ cycles for longevity. Compared to lead-acid battery,it's 2X more power,10X more starts,and 5X longer life
- Dimensions and Lightweight:: (L) 5.91 inch x (W) 3.37 inch x (H) 4.13 inch, Item Weight: 2.62 Lbs. YTX9BS battery Replaces battery sizes: YTX9A-BS, ETX9A-BS, LTX9A-BS, NTX9A-BS, FTX9A-BS, ENTX9A-BS, GTX9A-BS, MTX9A-BS, CTX9A-BA, M32X9A, MF12V7-2A, MFA127AH, PTX9A-BS, UTX9A, YTZ10S, CTZ10S, CTZ10S-BS, EBZ10-BS, EBZ10A-4, EBZ10A-4-1, FAITZ10S, FAYTZ10S, GTZ10S, LTZ10-4, M7210
- Safe and Fast Charging: YTX9-BS motorcycle battery Charges from 20% to 80% in 15 minutes with built-in smart protection, auto-switching to constant voltage mode for secure, efficient charging and extended lifespan
- Wide Compatibility: This YTX9 bs battery Compatible with most brands and models, motorcycles, ATVs, UTVs, PWCs, quads, 4 wheelers, jet skis, waverunners, scooters, riding lawn mowers, tractor, dirt bike, generators and more. Fit for Honda Honda ATV TRX300EX TRX400EX 300EX 400EX battery Kawasaki Suzuki Yamaha Harley Davidson Seadoo Polaris etc
- Extreme Temperature: Our YTX9 battery Reliably operates from -40F to 176F, delivering stable power in freezing winters or scorching summers, while its maintenance-free design guarantees hassle-free performance
Brand: Acoucou
Automotive Fit Type: Vehicle Specific Fit
Manufacturer: Acoucou
Manufacturer: Acoucou
Brand: Acoucou
Model: Acoucou 12V 4.25Ah Lithium Battery
Item Weight: 2.62 pounds
Package Dimensions: 6.11 x 4.57 x 3.62 inches
Item model number: YTX9A-BS
Batteries: 1 12V batteries required. (included)
Manufacturer Part Number: 12-4.25
Date First Available: July 1, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Sep 24
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Top Amazon Reviews
TLDR: Na-Ion is Better in every way except capacity for the same space. CCA is excellent and you don't have to worry about battery damage from discharge, storage, cold or heat (within its specs). I did some interesting research about Sodium-Ion (also called Na-ion as Na is the chem symbol for Sodium). They have a wide temperature range (this one quotes -40 to +80C, and most Na-ion car batteries go to at least +60C), are very light, and last for many thousands of cycles without fear of being ruined from over-discharge or heat. Note that Na-Ion generally has fewer Wh (or Ah) of energy storage and this one is also the case. This means the battery won't power things for as long as a new(er) Li-Ion or lead-acid (AGM) battery. I'd argue that issue is unimportant, is a vehicle recharges the battery. And, unlike the other chemistries, being run down won't damage sodium batteries, so you just boost it up again and you are back running with no concerns. As an added bonus, you can tell the state of charge of a Na-Ion battery by just measuring the voltage, as its voltage drops pretty linearly as you discharge it. It took some searching, but it appears these batteries are made from 4, "3V" cells. The cells are typically good for up to 3.9V each, which should put the max on this battery at about 15.6V. This is well in excess of what is needed for any charging system for standard AGM/lead-acid batteries, and the battery will probably hold this higher voltage as well if it is not being heaviliy drained. This means you don't need a fancy battery monitoring system, they basically can drop into where your old AGM/lead-acid battery was. If you are familiar with capacitors, they act more like capacitors than batteries (with a HUGE energy storage compared to a capacitor) and a cost similar to LiIon without the other drawbacks. The attached pictures give you some technical information, the box it shipped in and its markings, the battery size and markings on it, and finally a measurement with a combination volt and mili-ohm meter to show it has low (about 0.013 ohm) internal resistance (a good thing). The voltage shown on the meter is what it read when it was delivered, and translates roughly to a 65 to 100% charged AGM battery (12.69V). The reason 12.69V is a range of charge levels, is that there's a bit of variable opinion whether an AGM battery is full at 13.0 or 12.7V, but they basically ship "full" as the spec for AGM/lead-acid goes. Note also, one reason the capacity is rated low, is because they rate it at that 12.7V range. As mentioned earlier, the battery should support the full charge range, which would translate to more energy storage (though even that is a less compared to the same size AGM/lead-acid or LiIon battery). I still think the tradeoff is worth it, but now you should be able to decide what is best for your own needs.
...
show more
Reviewed in the United States on August 27, 2025 by zbret zbret
The media could not be loaded. I always wanted to experiment with a Sodium-ion battery, (Na-ion) so when I saw this battery available, I ordered it immediately. I build a lot of projects using LiFEPo4 and Li-ion batteries and always wanted to try one of these. I figured I would use it in my lawn tractor, then maybe try it in some solar projects. About 5 seconds after I ordered this battery, I realized it probably has different charging requirements. I'll get back to that. I installed the battery in my tractor, and it performed extremely well. I removed a lead acid battery that is about twice as large and much heavier, and this tiny battery cranked the engine no problem, as well as the lead acid battery. (I disconnected the ignition to show the cranking speed, otherwise the engine starts instantly) After this test, I immediately removed the battery, and it was still showing 12.59V DC. I had not charged it since receiving it, this was still the charge that it came with, minus what was used cranking the tractor engine. I removed the battery because it is not compatible with my tractor charging system, and after checking my numerous battery chargers (Li-on, LiFePo4, AGP, LA) I realized I had no way to properly charge this battery. I also have no solar charge controller that is compatible. I did a LOT of research on the subject, and a Na-ion charger is hard to find and expensive. Now all of that is MY fault, not the batteries' fault. The battery performed exactly as advertised and is a very good item. As far as a solar project I am concerned about the mere 4¼Ah capacity, that is not going to run much for very long. BUT, it definitely cranks a small lawn tractor engine no problem. I can't comment on longevity of course.
...
show more
Reviewed in the United States on September 4, 2025 by bobwatts bobwatts
So far this is working great for my motorcycle. It never failed to start with my old battery, but sometimes it would crank slow for a second but still start, but when it would do that the clock on the instrument cluster would reset. So far that has not happened so this new battery seems to have fixed that. It is crazy lightweight, it is 2 pounds 10 oz or 1193 grams, compared to 6 pounds 14 oz for my SLA that it replaced. I have knocked a star off for one simple reason: on most batteries the terminals have a slot that holds a square or rectangle nut that ideally fits snuggly so it can't fall out and won't require a wrench to hold it while tightening the terminal screw. This battery came with a standard hex nut that had tons of room to move around. Once that battery was in place there was no room for a wrench to hold it and just getting the nut maneuvered into place while you put the screw through the battery terminals was a huge pain in the rear end. They could have and should have done better, it's almost like the engineer of this battery had never looked at how it's done on a traditional battery.
...
show more
Reviewed in the United States on August 31, 2025 by JeffK651 JeffK651
Big fan of these sodium ion batteries. Acoucou seems to have delivered an excellent product. Comes with positive and negative terminals covers as well as a pair of bolts with washers and nuts. The battery housing is good quality plastic. There is a battery monitor safety chip on board to prevent bad charging. I was worried about using a li-ion charger but used anyway. Combined with the BMS chip it seems to have charged properly. Na+ sodium ion is what they are starting to use in electric cars. In my opinion most batteries will start converting to something like this soon. It's more cost-effective and better for the environment than lithium. This YTX9A-Na has 250 CCA , 4.25 Ah , and 51Wh. Plenty of power for such a light and small package. Great value compared to lithium and highly recommend.
...
show more
Reviewed in the United States on September 1, 2025 by Alex Alex