The simple answer to this question is, the LFX and the LFM batteries are the same. 

The LFM and LFX batteries share the same case and internal cells. Dimensions and electrical specifications are identical. In mid-2022 Shorai began equiping a BMS in our batteries to provide over discharge protection. At the time, there was no part number or name change to designate the addition of the BMS to differentiate from the previous generation batteries other than a red dot on the label of the battery. The only way to determine if a battery was equipped with a BMS was by the red dot or by looking up the LOT number from the bottom of the battery. In some cases the dot or LOT code sticker would wear off and it would no longer be possible to identify if it was equipped with a BMS. From a customer service standpoint, this became very difficult. In October of 2024 the decision was made to create a new part number and label for Shorai batteries, the new part number changing from LFX to LFM.

It is noteworthy to mention that the label on the front of the battery was changed slightly at the time the BMS was introducted into the product line. This change was due to the need to comply with IATA regulations. The original label used a PB/EQ rating to provide customers a way of comparison for Shorai lithium batteries relative to lead-acid batteries — a way to compare "apples to apples." However, to adhere to international shipping standards, the labels were changed to show an actual lithium capacity (Ah) rating.

Please rest assured, the capacity and amp hour ratings of the Shorai LFM batteries remain the same as the LFX-labeled batteries. The cells used in both models are identical.  As a side note, all batteries before the BMS change also includes the actual Ah and Wh rating on the bottom of the battery on a small sticker.

A. Yes. Lead acid charger/tenders can be used for regular maintenance charging and then be disconnected after the battery is fully charged.  HOWEVER, you may NOT use a charger/tender if it has an automatic "desulfation mode", "repair", "recondition", or "recovery" mode, which cannot be turned off.  DO NOT leave the lead acid charger connected to store the battery, because most will NOT maintain the proper voltage for lithium batteries.  

Just set a reminder on your phone to charge once every month if you aren't riding or using your vehicle.

Recent Shorai batteries include a Battery Management Circuit that prevents over-discharge if the battery charge has not been properly maintained. CLICK HERE for details on how to "unlock" the battery in that case, to allow normal charging again.

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Shorai™ batteries should be recharged whenever voltage drops to 13.15 volts, or sooner.  When shipped lithium batteries have a very low 30% state of charge, so always fully charge your new Shorai battery before first use in the vehicle.


If you have a vintage, custom, or off-road vehicle which has NO draw on the battery when key is OFF, then you should only need to charge your Shorai™ battery once a year.  However, most modern street bikes have a draw even when key is off, to support clock, computer, alarms, or other devices.  This draw will eventually drain the battery, which is damaging and could void your warranty. So if you are not riding once a month or more, then you should charge the battery every month (or more, for rare bikes with very high key-off draw).  Alternatively, you may disconnect the negative cable from the battery for storage, and charge once per year in that case.


“Smart” lead-acid chargers with automatic cutoff may be used for periodic charging, but will NOT work as a tender/maintainer and should be disconnected immediately after charge has finished.  Older lead-acid chargers without automatic shut-off should never be used. Improper charging is dangerous and will void your warranty.  

 To see complete information on charging and recovering discharged batteries, CLICK HERE

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A. The short answer is yes! Shorai batteries are an easy drop-in replacement upgrade.  Your vehicle charging system should be working within standard spec (generally that means charging at 13.6-14.4 volts when running), and please use our Battery Finder to select the correct battery for your vehicle. Call us for a recommendation if you don't see your vehicle listed or if you have a custom built motorcycle.

Our Shorai batteries are a great fit when properly matched to the engine and starter of any custom vehicle.  The ability to fit a battery horizotally really can come in handy, compared to lead-acid batteries which must always be topside up.  Do not install the Shorai battery topside down.  The Shorai Battery warranty is only maintained if the Shorai battery chosen for the custom vehicle is the one we recommend for the original vehicle's engine and starter system, and there have been no engine modifications (such as high compression) that would cause excessive starter system current (amps).  If you have a stock motor pulled from another vehicle, then you can use our battery finder to select the battery that the motor came from as long as the compression ratio and starter gearing is the same.

Standard recommendation is meant to provide the same starting performance and capability as the OEM equivalent battery.

The Duration recommendation is more suited towards vehicles that are ridden less often, have more accessories, a modified engine and/or charging system.  We always refer to the Duration battery for those who want the strongest possible cranking performance and lifespan from Shorai batteries.

A. Cool storage is good for any type of battery.  You may remove the battery from vehicle for summer storage and place in a cool, dry location – with terminals taped to avoid short circuit (ideal is about 34F/1C, so a refrigerator is great).  Avoid long storage at temperatures below 0F/-18C or above 90F/32C whenever possible.  Any charging during storage should be performed at temperatures above freezing.

If you want to keep the battery in the vehicle during storage, but are uncertain when you’ll ride next set a reminder to charge your battery once a month, for most vehicles.  If you know that your vehicle has an especially high key-off drain then charge more often, accordingly.  If using the Shorai BMS01 Charger use CHARGE MODE to charge ocassionaly as needed during storage.

Shorai Batteries have included a BMS protection circuit since mid 2022.  If battery voltage falls too low, the main terminals are disconnected to prevent a damaging "too deep" discharge.  In this case charging with a "smart" battery charger may not work, as the charger will see zero volts and refuse to start.  The BMS can be unlocked several ways:

1) Use the Shorai BMS01 Charger in CHARGE MODE (not store mode)
2) Attach any 12V~15V DC Power Supply to main terminals for just 3 seconds
3) "Jump" from one 12V battery to the LFX battery for just 3 seconds (best to use another motorcycle battery rather than car)
4) Use an old "dumb" charger. If charger output is more than 2A only use it to unlock the BMS, then shift to an appropriate charger for LiFe Lithium

If you ride once a month or more, there is no need to ever charge for most  motorcycles. 

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A. First, we need to understand that the primary job of a starter battery is to flow a large current (amperage) for a short time in order to start a vehicle. In order to do that efficiently, the battery must have low internal resistance. Holding all other considerations equal, the more capacity a battery has the lower its resistance will be -- thus it will be more able to crank a vehicle under high loads.

Lead-acid makers have therefore used AHr(capacity) ratings as shorthand to indicate cranking ability, rather than a real usable capacity. The lead-acid capacity rating itself is based on a complete discharge at a low discharge rate. Under actual cranking conditions they will deliver considerably less than spec capacity. And because lead-acid batteries begin sulfating when only a small percentage of the capacity has been used, and their internal resistance rises as they are discharged, the actual capacity which can be USED may be as little as 20% of the mfg. rating. Discharge in excess will not only damage the lead-acid battery, it may not allow proper starting as voltage sags.

Shorai batteries are based on a completely different chemistry. Not only do they have less than 1/3 the internal resistance per capacity than do lead-acid, they are also the ultimate "deep-cycle" battery. The internal "completely discharged" capacity of a Shorai battery is 1/3 the rated "PBeq" capacity. For example, the LFX18 12V series have 6Ah cells internally. But the cells are capable of 80% discharge without damage and while retaining more cranking ability. As such, the USABLE capacity(or "reserve capacity") of an LFX18 12V battery is on or very near par with 18AHr-rated lead acid batteries, while providing superior cranking performance and a vast reduction in weight. The Shorai PBeq AHr (lead-acid equivalent) rating system therefore allows users to compare a very different technology from lead-acid, but on a close apples-to-apples basis when making a choice.

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A. CCA ratings another way that lead-acid makers have tried to convey starting power. Unfortunately, their typical spec is based on a "half-nominal-voltage" delivery. That is, at their CCA spec, you can expect 7.2V delivered, at best; and 7.2V isn't useful, as you won't start a vehicle with it... 

In any case, CCA ratings aren't about actually drawing that much current from a battery. The typical vehicle which uses a 200A CCA-rated battery, for example, will only draw 45A~80A from the battery. What the CCA rating really intends to convey is how much voltage will be delivered. Higher CCA rated batteries will deliver more voltage at the same actual cranking current. Our LFX are CCA rated to deliver 9V for a 5-second crank at the CCA rated current. (in fact, our average voltage delivered will be even higher during a 30-second crank. But our CCA ratings are intended to indicate not only a measure of voltage at true cranking currents, but also proper usage, which lead-acid do not) At actual cranking currents - which are always well below CCA, LFX deliver up to two volts more than an equivalent-CCA-rated lead acid battery. Current alone won't start anything. It is the current multiplied by voltage that does the work (watts). In reality, this means that you can multiply the Shorai CCA rating by 1.5x to compare to a Lead Acid battery CCA. For example, our 270A CCA LFX18 series provides about the same cranking voltage as a 405A-CCA-rated lead acid battery (from a quality lead-acid maker; some CCA specs we've tested on the cheapest lead acid seemed to be plucked from thin air).

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A. WATER/CORROSION: Avoid high pressure power washing around the battery case, or constant exposure to water.  If the battery may be occasionally submerged, we highly suggest application of sealant to fill the horizontal seam between top and bottom of the battery case, and that the 5-pin port be fully packed with dielectric grease. (dielectric grease is a good idea in any case to insure no pin corrosion).  Also, heavy grease should be liberally applied to terminals for wet environments

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A. Starter batteries of any type contain a large amount of energy.  During a short circuit, ALL that energy is released in a matter of seconds, creating an extremely hot arc welder, possibly causing fire or explosion. You MUST be very careful at all times to avoid short circuit of the positive and negative terminals.  Do NOT wear jewelry on wrist or neck while handling batteries. INSURE that when installed the positive and negative terminals are properly covered and insulated from the vehicle.  Do NOT use carbon fiber battery hold down units, as carbon is an electrical conductor. When replacing a battery, its important to verify that your charging system is working properly and the output voltage is within the recommended range of 13.6-14.4v. At no time should the charging system output be above 15.2v or it can damage the battery.

Be CAREFUL!

A. Down to about 20 degrees Fahrenheit (-7C) most users find that they can start normally on first crank. If your headlight comes on at key-ON, it is good for the batteries to flow some current before cranking in cold weather. The suggested headlight-on time before cranking depends on the temperature. If starting at 40F/5C, 30 seconds will help wake the battery and increase cranking performance. If at 0F/-17C, leave the lights on for 4~5 minutes before cranking. The result will be a better first crank, and longer battery life.  If the engine fails to start on first crank, that first crank has warmed the battery, and the second attempt will be much stronger. Other accessories that can be turned on before cranking can also be used for this purpose, such as heated gear, radio, etc...  Insuring that the battery is fully charged after storage also improves first-start performance in cold weather.

A. Please note that Shorai starter batteries have been formulated to improve performance in every aspect of performance for their intended usage as powersports drop-in, upgrade starter batteries. 

Our batteries are made strictly as powersports starter batteries and our warranty does not cover any failure to supply a capacity in any other application, total loss system or deep-discharge usage. 

Shorai's "PBeq" capacity rating IS NOT actual cell capacity, but is ONLY intended as an indicator of vehicle cranking capability.  Please see the FAQ Question: "How does the Shorai "PBeq AHr" capacity rating compare to lead-acid Ahr ratings?" for further information.

Please visit http://shoraipower.com/ PRIOR TO INSTALLATION and use our year/make/model finder to verify that you have purchased the correct battery for your vehicle.  Use of an incorrect battery in your vehicle can be dangerous and will void any guarantee or warranty. Batteries are not covered under usage in electric vehicles. Use in aircraft, automobiles, and motive power applications are not recomended  and will void any guarantee or warranty.  If your Shorai™ battery is not recommended for your vehicle, contact your seller to exchange it for the proper battery.  

Please CLICK HERE to visit http://shoraipower.com/customer-service for warranty terms.