Super73 Battery Replacement: What Fits Your R or S Series — and What It Really Costs

A 960Wh pack with the same LG cells Super73 specifies, in stock in Germany, for €629 — charger and holder included.

A Super73 with a tired battery is a heavy bicycle. That's the honest version of what happens — the bike you spent a lot of money on slowly becomes something you push up the last hill.

We've been building e-bike batteries for 15 years. We got tired of watching R and S Series owners wait months for a replacement pack, or pay a number that made no sense for what was in the box. So we built our own: a 48V 20Ah (960Wh) downtube battery running the same LG M50LT cells Super73 specifies, in stock in Germany, at €629 with the charger and holder included.

What follows is everything worth knowing before you buy one — which bikes it fits, what's actually inside, and the three things this battery doesn't do.

Why Super73 Owners End Up Buying a New Battery

Three things send people looking. Only one of them is really the battery's fault.

The pack has aged. Lithium cells lose capacity from the day they're made. Ride three or four seasons of daily commuting and a 960Wh pack that used to cover your round trip starts finishing with two bars left. Nothing broke. The chemistry simply moved on.

The pack won't wake up. Park a bike over winter at a low charge and the BMS will eventually trip into protection. You plug in the charger and get nothing — no light, no click. Most owners read that as "dead battery" and start shopping.

The replacement is hard to get. This is the one that surprises people. Super73 sells a lot of bikes, and replacement packs aren't always sitting on a shelf. Spend an evening in owner forums and you'll find riders waiting weeks, or giving up on a bike that still works fine.

We're not the official parts channel and we won't pretend to be. We're a manufacturer that saw a gap: riders who want to keep the bike they already own.

Check These Three Things First

If your pack is behaving like it's dead, ten minutes of checking can save you €629.

• Try another outlet and watch the charger. If its LED never comes on, the charger is what failed — not the battery. Much cheaper problem.
• Leave it connected for 12 hours. A deeply discharged pack can sit for hours before the BMS lets current through. If the charger stays cold and the light never changes, that's a real answer.
• Check the inline fuse, if your build has one. A blown fuse looks exactly like a dead pack.

If none of that brings it back, the pack is the problem — and you're in the right place.

What's Inside: 48V 20Ah, 960Wh, 52 LG Cells

Spec	Value
Voltage / capacity	48V / 20Ah
Energy	960Wh
Cell	LG 21700 M50LT, 5.0Ah
Configuration	13S4P — 52 cells
Max discharge current	30A continuous
Protection cutoff	70A
Full charge / end voltage	54.6V / 36.4V
Cycle life	1,000+
Weight	approx. 4.6 kg
Charger	48V 3A GaN, 3-pin (included)
In the box	Battery, charger, holder, adapter strip, discharge cable, 2 keys, manual
Warranty	18 months battery / 12 months charger

Read the configuration line, because it explains the rest. Thirteen cells in series give you 48V nominal. Four in parallel share the current. That's 52 cells, and because each one carries a quarter of the load, none of them works hard enough to get hot — which is what actually decides how long a pack lasts. A 3P pack of the same capacity would run warmer and fade sooner.

The 30A continuous rating is what matters on a climb. The 70A cutoff is the safety net behind it. Full charge is 54.6V, and the BMS stops discharge at 36.4V.

Cells First: Why LG M50LT Matters More Than the Sticker

Batteries don't get cheap in assembly. Spot welding and a plastic case cost about the same whoever does them. They get cheap in the cells.

An unbranded 21700 can be sold as "5000mAh" and still deliver well under that under a 30A load, then lose capacity much faster after a few hundred cycles. None of it is visible from outside, and by the time you notice, the return window has closed.

LG M50LT is a production cell from a major manufacturer with a datasheet you can go and read. That's the whole point — you can check the claim instead of taking our word for it. Our pack uses 52 of them in 13S4P, with a BMS that caps continuous draw at 30A and cuts off at 70A.

We choose the cells, build the packs, and run the aging tests. That's why we can put 18 months on the battery and 12 on the charger without hesitating.

Will It Fit? Super73 Compatibility, Model by Model

Read this part twice.

Your bike	Fits?	What you need
R Series (RX, R Brooklyn…)	Yes	Drops straight in. The adapter strip is not needed.
S Series (all except S1)	Yes	Same mount, no adapter needed.
Z Series (all except Z1)	Yes, with adapter	Connector differs — use the adapter strip included in the box.
S1	No	Not compatible.
Z1	No	Not compatible.

Z Series: One Extra Step

Z Series bikes use a different connector, so the pack needs the adapter strip that comes in the box. It takes about a minute — fit the strip, seat the battery, lock it. If the pack rocks, or the display doesn't come on, stop and check the strip is fully seated before you ride.

Z Series hardware changed across model years. If you're not sure which build you have, send us a photo of your current connector before ordering. We'd rather answer that email than process a return.

From Box to First Ride: Four Steps

1. Power down and unlock the old pack. Switch the bike off, use the key to release the battery, and note which way the connector faces. Photograph it — step two becomes obvious.
2. Check your connector. R and S Series go straight in. Z Series needs the adapter strip first.
3. Seat it and lock it. Push the pack into the holder until it stops, turn the key, then try to rock it. Any movement means it isn't seated.
4. Charge with the included charger. Your original Super73 charger will not fit. The pack uses a 3-pin port, and the 48V 3A GaN charger in the box is the one to use.

Charge it fully before the first ride. It ships at a storage charge, which is right for transport and wrong for a 20-mile first trip.

Charging and Storage: How to Get 1,000+ Cycles

From empty, the 3A charger needs roughly seven to eight hours. That's arithmetic from the charge rate rather than a lab measurement on your bike, but it's the number to plan around if you charge overnight.

Four habits that make a measurable difference:

• Don't park it at 100% for weeks. Charge to full before a long ride, not every night for a two-mile commute.
• Store it at 50–60% if the bike is going away for the season, and top it up every couple of months. This single habit is the main reason packs "won't wake up" in spring.
• Don't charge below 0°C. Let the pack reach room temperature first.
• Keep it out of hot cars and sun-baked sheds. Heat ages lithium faster than anything else you'll do to it.

The pack is rated for 1,000+ cycles. One full cycle a week is a very long time.

Three Things This Battery Doesn't Do

Better to read it here than discover it on delivery day.

There's no LED gauge on the pack. One button switches it on, one switches it off. Your bike's display still shows the battery level while you ride, so nothing changes there — but you can't lift the pack off and read its charge at a glance.

Your original charger won't fit. Already said, and worth saying twice, because it's the most common surprise. The 3-pin port and the included GaN charger are a matched pair.

This is a like-for-like replacement, not a capacity upgrade. 960Wh is what the R and S Series ship with. If you want the range you had when the bike was new, this is that. If you want more range than the bike ever had, this isn't it — and you should know before you order, not after.

Why €629 — and What the Cheap Packs Leave Out

What you get	YOSE 48V 20Ah	Typical budget pack
Capacity	960Wh (48V 20Ah)	Often 48V 13–15Ah
Cell	LG M50LT, named	Unbranded, unlisted
Charger + holder	Included	Usually extra
Warranty	18 months	Often 6–12 months
Ships from	Germany, 2–4 working days	Overseas, 2–4 weeks
Returns	EU address	Often overseas

Two things explain the number. We sell direct from stock in Germany, so there's no importer margin and no six-week freight wait. And 960Wh with named cells is what it costs to build properly. There's no version of this pack at €300 that isn't cutting something.

The comparison that matters isn't €629 against a €300 listing. It's €629 against a €300 listing plus a charger, plus a holder, plus the odds that a 13Ah pack of unlabelled cells fades inside a year.

Three questions worth asking any seller, including us:

• Which cells, exactly? A model number you can look up, or "high-quality lithium"? Only one of those is checkable.
• What's the continuous discharge rating? If it isn't published, assume it's low.
• Where do returns go? An EU address turns a two-month problem into a two-week one.

A cheap pack that arrives in three weeks and dies in eight months isn't cheap. It's a subscription.

Frequently Asked Questions

Confirm the Fit, Then Ride

960Wh. 52 LG M50LT cells in 13S4P. 30A continuous with a 70A cutoff. Charger and holder in the box, 18 months of warranty, stock in Germany shipping in two to four working days.

If you know your bike, you're done deciding. If you don't, send us a photo of your current battery and connector and we'll tell you straight — including when the answer is that this one won't fit.