Best Razor Dirt Bike Battery Upgrade Options

Want a longer Razor dirt bike battery life? It’s better to upgrade the battery than to tweak the controller. 

Though not all electric dirt bikes offer easy component upgrades, most kids’ dirt bikes can be upgraded, and it’s not hard to do. On the other hand, Razor dirt bikes need more elbow grease to upgrade. 

Scouring the net for compatible batteries is the hard part. But don’t worry, we’ve got your back. Check ’em out here.

Razor Dirt Bike Stock Batteries

Razor did a great job stripping down the MX350 in this video to give riders a clean perspective of the bike. This still from their video really pulls you in tight to see the core components. The Razor is indeed a simple bike, and you can see the battery placement here, and get a sense of what you need to do to remove it. (Source: Razor)

How Long Does a Razor Dirt Bike Battery Last?

Here’s how long each Razor dirt bike battery can last:

Razor Electric Dirt Bike ModelStock Battery Voltage and CapacityRange
MX12512V 5Ah~16mins
MX35012V 10.5 Ah~30mins
MX50012V 12Ah~40mins
MX65012V 12Ah~40mins

The first thing you probably noticed is why the MX500 and the MX650 use the same battery type. That’s because–and keep this on a hush–it’s the same bike, just different stickers. Despite what some Razor shops may tell you to get an extra dollar.

Razor Dirt Bike Battery Upgrade Options

Here’s the gist of it. We all like spending more time on the saddle – especially our kids. We can do that with upgraded batteries. Here you can find out which battery upgrades fit your Razor dirt bike model, how much they cost, and if they’re worth it.

Can You Upgrade a Razor Electric Dirt Bike’s Battery?

The short answer is, yes. Upgrading your Razor electric dirt bike’s battery has a number of benefits, including a longer range. The downsides aren’t that bad, and you can ignore them if you want. Those include:

Advantages

  • Longer operating time–which is what we all love
  • Faster charge time (depending on battery features) lets our kids quickly get back on the saddle after a short break
  • Better heat management, so your battery doesn’t burn out as fast
  • Boosts your motor’s power (based on voltage)

Disadvantages

  • Added weight (though for Razor dirt bikes, it’s nearly unnoticeable)
  • Some wires might need to be modified (depending on the battery)

Razor Dirt Bike Batteries: What’s available?

Razor dirt bikes come with a pretty universal battery compartment design so you can pretty much interchange batteries among all of them. Although you might need to modify some components such as the frame or motor to maximize compatibility.

Here’s a table where you can see which battery upgrade goes with which Razor dirt bike:

Razor Electric Dirt Bike ModelBattery Replacements and Upgrades Compatible
MX12512V 5Ah Replacement Battery
MX35012V MX350 Battery Upgrade with Extended Range
Mighty Max 12V Lithium Battery Upgrade
MX500/MX650CASIL 12v 12ah F2 Sealed Lead Acid AGM Rechargeable Deep Cycle Battery
UPG 12V 12Ah Replacement Battery
Inovel Power Casil 12V 12Ah F2 Razor Battery
Power King Razor 36V High Performance Rechargeable Batteries

Razor MX125 Battery Upgrades

This rendered angled shot of the Stock MX125 battery by Razor gives us a good idea of the battery’s dimensions. Perfect fit for a tiny beginner bike. (Source: Razor)

What Size Battery Does a Razor MX125 Take?

What Size Battery Does a Razor MX125 Take?

The Razor MX125 takes a tiny battery size, at 3.54″ x 2.76″ x 3.98″, which is half the size of bigger Razor dirt bikes’ stock batteries. That’s like a toddler’s lunch box. This is for a stock bike and components, of course.

How Long Does a Stock Razor MX125 Battery Last?

The stock Razor MX125 battery lasts about 16 minutes, tops. I’m not sure “long” is the right word. I guess it’s about how short the Razor MX125 battery lasts, at about 16 minutes. With a 4-hour charge time, you’re better off getting your kid a pedal bike.

Available Battery Upgrades for the Razor MX125

There are not a lot of battery upgrades compatible with the stock Razor MX125. Unless you totally overhaul your bike (motor, frame, controller), the best you can get is a replacement battery with the same power and capacity but a better power flow. The only option we have below is a 12V 5Ah Razor MX125 replacement battery.

Battery Name12V 5Ah Razor MX125 Replacement Battery
Voltage12 Volts
Capacity5 Amp hours
Range~20mins
Dimensions3.54″ x 2.76″ x 3.98″
Cell TypeLead Acid

Available Battery Upgrades for the Razor MX125: 12V 5Ah Battery for Razor MX125

The 12V 5Ah is a high performance lead acid battery upgrade for the Razor MX125. It comes in a sealed polymer shell that measures 3.54″ x 2.76″ x 3.98″, which is the Razor MX125’s stock battery size. Although it’s meant to replace the stock battery, it features better power flow that makes it more efficient. Therefore, increasing the bike’s range to 20 minutes. Not much oomph, but an extra five minutes in the saddle wouldn’t hurt.

You can currently get this Razor dirt bike battery upgrade for 42.99 USD. That’s a lot cheaper than getting Razor’s stock battery.

Razor MX350 Battery Upgrade Kit

This side shot of a bare Razor MX350 gives us a great look at the stock battery. Sorta looks like a car battery–if only it had the same power. (Source: Razor)

What Size Battery Does a Razor MX350 Take?

Razor MX350’s stock battery case takes a rectangular 5.94in x 2.56in x 3.72in battery. About the size of your typical high school lunchbox. Or, two MX125 stock batteries stuck together.

How Long Does a Stock Razor MX350 Battery Last?

Razor MX350’s stock battery lasts 30 minutes – nearly double the MX125’s performance. This isn’t a lot of riding time, but it’s fine for first-timers. For anyone else, the battery needs an upgrade.

Available Battery Upgrades for the Razor MX350

In the same way as the MX125, the stock Razor MX350 does not have a higher voltage battery upgrade. You can still get batteries of the same voltage and increased range and power management, as well as lithium batteries with longer life. 

Here are the upgrades that work with current Razor MX350 models:

Battery NameBullsPower 12V MX350 Battery Upgrade with Extended Range
Voltage12 Volts
Capacity9 Amp hours
Range~40mins
Dimensions5.95″ x 2.56″ x 3.94″
Cell TypeLead Acid

Quite a bit of upgrade from the stock with twice the saddle time. I’d recommend this for starters since it doesn’t cost a lot.

Battery NameMighty Max 12V Lithium Battery Upgrade
Voltage12 Volts
Capacity7 Amp hours
Range~50mins
Dimensions5.94″ x 2.56″ x 3.87″
Cell TypeLithium Iron Phosphate

Even better with 50 mins of range boost. Now your kid can have a bit more fun on the bike without having to worry about charging for the next near-hour.

Available Battery Upgrades for the Razor MX350: 12V MX350 Battery Upgrade with Extended Range

BullsPower’s 12V extended range battery upgrade works with the Razor MX350, and the wiring is built right in so you don’t have to solder anything. Made of non-conductive ABS plastic, it resists shock, vibration, chemicals, and heat. This Razor dirt bike battery upgrade boosts your MX350’s runtime from 30 minutes to 40 minutes.

Better yet, it’s available on Amazon for just $37.50 USD.

Available Battery Upgrades for the Razor MX350: Mighty Max 12V Lithium Battery Upgrade

The Mighty Max 12V lithium battery upgrade is a rectangular block of lithium cells that extends the range of your Razor MX350 from a modest 30 minutes to around 50 minutes. This makes the Razor MX350 lithium battery upgrade one of the best available. Made from high-quality components, this battery comes with a battery management system (BMS). Battery management systems offer all kinds of protection, including overcharge and short circuit protection.

Right now, the only place you can get this battery upgrade is from Mighty Max for $44.99 USD.

Razor MX500/MX650 Battery Upgrade Kit

Schultz did an awesome job stripping down the MX650 to show riders what’s inside. This shot from his video lets you see the bare bones. There’s nothing fancy about this Razor MX650, but you can see what’s involved in removing the triplicate battery here. Plus, you can connect several small batteries together or get a bigger one. Sweet! (Source: YouTube)

What Size Battery Does a Razor MX500/MX650 Take?

The Razor MX500 and MX650 take the same 3.54″ x 2.76″ x 3.98″ batteries – In spite of the fact that the Razor MX500 and MX650 look much bigger than the MX350 – only 3 of them are connected together. This makes for a higher voltage and more efficient power delivery and range.

How Long Does a Stock Razor MX500/MX650 Battery Last?

The stock Razor MX 500 or MX650 battery lasts about 40 minutes of saddle time due to their triplicate stock batteries. Those are the best numbers you can get from a stock Razor dirt bike. No big deal, but you can always change out the batteries for more range.

Available Battery Upgrades for the Razor MX500/MX650

The Razor MX500 and MX650 actually have a decent number of upgrades available on the market, unlike the MX125 and MX350. The bigger toys always get the attention, right? Let’s look at what we found:

Battery NameCASIL 12v 12ah F2 Sealed Lead Acid AGM Rechargeable Deep Cycle Battery
Voltage12 Volts
Capacity12 Amp hours
Range25 mins
Dimensions5.94 x 3.88 x 4 inches
Cell TypeLead Acid

It’s a pretty sweet setup from the stock battery which only gives ~17 mins each. Too bad you’ll have to buy three of these to completely power up the MX500/MX650.

Battery NameUPG 12V 12Ah Replacement Battery
Voltage12 Volts
Capacity12 Amp hours
Range25 mins x 3
Dimensions5.94 x 3.88 x 4.06 inches
Cell TypeLead Acid

This one is more of a killer deal than the first one since it comes in a set of 3 when you buy it. Don’t have to spend extra to get the same amount of range on your Razor MX500 or MX650.

Battery NameInovel Power Casil 12V 12Ah F2 Razor Battery
Voltage12 Volts
Capacity12 Amp hours
Range~25 mins
Dimensions‎5.9 x 3.9 x 4 inches
Cell TypeLead Acid

Just like the first one, you get ~25 mins of extra range for every battery pack, BUT you gotta buy it 3-times to power your Razor. I’d suggest this one as a replacement for every single one of your Razor MX500/650 battery packs.

Battery NamePower King Razor 36V High Performance Rechargeable Batteries
Voltage12 Volts x 3 (36 Volts)
Capacity12 Amp hours
Range~30 mins x 3
Dimensions5.95 x 3.86 x 3.7 inches
Cell TypeLead Acid

By far the best that you can get. In addition to the awesome 30-minute range boost, you get this battery in a package of three. Plus, it’s plug and play. No need to modify anything.

Available Battery Upgrades for the Razor MX500/MX650: CASIL 12v 12ah F2 Sealed Lead Acid AGM Rechargeable Deep Cycle Battery

The CASIL 12V 12Ah rechargeable power pack is an SLA deep cycle battery that increases the Razor MX500 and MX650’s range beyond that of the stock batteries. If you’re not familiar with deep cycle batteries, they look a lot like car batteries, but they’re totally different.  Deep cycle batteries are lead batteries that can run until they’re 80% discharged or more when they need to be recharged. You can discharge deep-cycle batteries up to 80%, but most manufacturers suggest not going below 45% to keep them going longer.

When installed in triplicate, this Razor dirt bike battery upgrade on the MX500/MX650 raises the range from 40 minutes to 75 minutes. You can get one battery from Amazon at just $27.99 USD, although you’ll need three of them to get the maximum effect.

Available Battery Upgrades for the Razor MX500/MX650: UPG 12V 12Ah Replacement Battery

The UPG 12V 12Ah replacement battery is a sealed lead-acid (SLA) absorbed glass mat (AGM) rechargeable battery with a range of 25 minutes on a Razor dirt bike. You’ll need 3 of these for the Razor MX500 and MX650 to increase their runtime to 70 minutes. What’s great is that you get this battery already charged, sealed, maintenance-free, and ready to install.

You can get 3 Razor dirt bike battery packs for just $89.94. That’s a 15 percent discount from their original $124.99 price.

Available Battery Upgrades for the Razor MX500/MX650: Inovel Power Casil 12V 12Ah F2 Razor Battery

Casil 12V 12Ah F2 Razor Battery from Inovel Power is a low-cost replacement for Razor MX500 and MX650 batteries. Despite not being much of an upgrade, this Razor dirt bike battery pack gives you slightly more range. You can expect a range increase from the stock 40 mins to 50 mins. It’s also maintenance-free, so you don’t have to worry about toxic battery fluids leaking. However, it’s also not repairable.

Luckily, you can easily get new ones from Amazon at a humble $24.99 USD. 

Available Battery Upgrades for the Razor MX500/MX650: Power King Razor 36V High Performance Rechargeable Batteries

Here’s the best Razor dirt bike battery upgrade we found for the stock MX500 and MX650 models. Power King 36V high performance rechargeable battery is a sealed lead acid power pack with a built-in battery management system for better performance and longer life. This increases the MX500 and MX650 range from 40 minutes up to 90 minutes-which is the maximum you can get from the stock MX500s and MX650s.

Furthermore, Amazon offers a 3-piece pack of this Power King Razor dirt bike battery upgrade for just $89 USD. It also comes linked together so you won’t have to worry about setting it up. Just plug & play.

Now that you know which batteries you want, time to find out how do you change the batteries on a razor dirt bike.