McCain Valley, about two hours east of San Diego, roughly four miles from where we parked the van. Kyler still had a bar left on his Rawrr Mantis Mini. Riley was fine, because Riley is always fine. And I was standing next to a Sur Ron Light Bee that had gone from “plenty of battery” to “expensive 130-pound paperweight” in about eleven minutes.
Turns out the last stretch back to the van is uphill. Turns out a nine-year-old thinks a grown man pushing a dead e-moto is the funniest thing that has ever happened to anybody, ever. He rode slow circles around me the entire way. My wife filmed a chunk of it from her Levo. That footage exists and I will never be free of it. That was the day I stopped telling myself I’d just “ride smarter” and started actually researching a real Sur Ron battery upgrade.
What a Sur Ron Battery Upgrade Actually Changes
Here’s the thing nobody explains clearly when you first go looking: a battery has two numbers that matter, and they do completely different jobs.
Amp hours (Ah) are the size of your gas tank. More Ah means more miles. That’s it. That’s the whole story.
Volts (V) are the size of your engine. More voltage means more top speed and a harder hit off the bottom. It does not, by itself, give you more range — and if you ride it the way more voltage begs you to ride it, you’ll actually get less.
A stock Sur Ron Light Bee runs a 60V 32Ah pack, which is roughly 1.9 kWh. In the real world that’s somewhere between 25 and 40 miles, and the spread between those two numbers is entirely about how you ride. Cruising fire roads at 20 mph? You’ll be at the top of that range. Full-throttle hill repeats with a 200-pound guy on board in 95-degree desert heat? You will find the bottom of it. Ask me how I know.
So before you spend a dollar, answer one honest question: do you want to go farther, or do you want to go harder? Because those are two different purchases, and buying the wrong one is how people end up disappointed with a very expensive box of lithium.
The Four Real Upgrade Paths (And What We’d Buy Again)
1. A bigger 60V pack (40–45Ah). This is the boring answer and it is almost always the right one. You keep your stock controller, your stock charger works, nothing else on the bike has to change, and you pick up something in the neighborhood of 30–40% more range. It is the single least dramatic and most useful thing you can do to a Light Bee. If you’re reading this because you got stranded, buy this one.
2. A 72V pack. This is the fun answer. It is also the one that turns into a project, because a 72V pack really wants a controller that can use it, and once you’re in the controller you’re in the wiring, and once you’re in the wiring it’s Sunday night and the bike is in pieces. We went down this exact road and wrote the whole thing up here: our 72V battery upgrade, what we learned the hard way. Short version: worth it, but do it because you want more power, not because you want more range.
3. A range extender or second pack. Underrated. If you ride out of a vehicle — and we always do, the Sprinter is basically a rolling charging station and lunch counter — a second battery in the van is dead simple. Swap packs at the truck, eat a sandwich, ride the second half of the day. No wiring, no controller, no forum threads at midnight.
4. Rebuilding or repacking cells. Only if you genuinely enjoy this stuff. Spot welding your own pack is a real skill and a real fire risk, and I say that with total respect for the people who do it well. I am not one of those people.
Whichever path you pick, here’s what actually separates a good pack from a bad one, and it is not the headline Ah number on the sticker:
- Cell brand. Samsung, LG, Molicel. If a listing won’t tell you what cells are inside, that’s your answer.
- Continuous discharge rating. A pack that can dump 100A continuous behaves completely differently under load than one rated 50A, even at identical capacity. This is the spec that decides whether the bike feels strong at the top of a climb or goes soft.
- BMS quality. The battery management system is the thing standing between your garage and a very bad evening. Do not cheap out here.
- Physical fit. Some big-capacity packs do not fit the stock frame triangle without modification. Measure first. Please learn from other people on this one.
- Charger. A bigger pack on the stock charger just means a longer wait. A 10A fast charger turns an overnight charge into a lunch break.
One field note from our home turf: at McCain Valley OHV, a full day for us is about 35–45 miles with a lot of stop-and-start, kid pace, and one or two sessions of hitting the same hill fifteen times because Kyler decided that hill was the day’s entire purpose. Stock, that’s a squeaker. On a bigger pack it’s a non-event. If you’re scouting new terrain, Trailforks is worth the subscription just for figuring out how much elevation you’re actually signing up for — climbing is what eats batteries, not distance.
Why Range Is Really About Time With Your Kids
I want to be careful not to turn a battery article into a TED talk, so I’ll keep this short. But the reason I care about range has almost nothing to do with specs.
When the battery dies, the day ends. Not on your terms — on the battery’s terms. And when you’ve driven two hours, unloaded three bikes, gotten two kids into gear, and finally hit the good stuff, having the day get called early by a percentage readout is genuinely deflating. Riley has a very specific face she makes about it.
More range means we ride until we’re tired instead of until we’re empty. It means saying yes when Kyler asks to go check out what’s over the next ridge. It means the ride ends with sunburns and snacks in the van instead of me walking a bike uphill while being narrated by a child. That’s the whole return on investment. That’s it.
That’s also, more or less, how this brand happened. We go do the thing, the thing turns into a story, and the story turns into a design. If you want the longer version of how our bikes got where they are, there’s the Light Bee and eRide Pro build, and the day Kyler got his first electric dirt bike, which permanently changed our weekends.
What We Were Wearing
The shirt I had on the day of The Great Push is the Kyler Braap father-son e-moto design. It came out of exactly this kind of riding — a small kid on a small bike absolutely sending it while dad tries to keep up. The design isn’t a concept somebody sketched in an office. It’s a specific kid, on a specific bike, on specific dirt, doing something that made the whole family stop and watch.
The rest of what we wear out there lives in the e-moto and electric dirt bike collection — designs pulled from actual desert days, actual dust, and at least one actual four-mile walk. If you also ride pedal-powered stuff on the weekends the bikes aren’t charged, the mountain biking shirts come from the same place. The trip came first. The design followed.
Look, a Sur Ron battery upgrade is not glamorous. Nobody posts a photo of a battery. But it’s the difference between a half-day and a full day, and full days are the entire point of having the bike. Get the bigger pack, charge it the night before, throw a spare in the van, and go find out what’s over the next ridge.
The trip came first. The shirt came second. Now go do more stuff that makes you stoked.