Battery adapter for Rolleiflex SLX, 6006 (USB-C battery)

• High-current board with gold-plated contacts: passes short current peaks cleanly, so the fuse does not mistake them for a continuous load. This also gives stiff-running cameras some reserve, but it is no substitute for servicing.
• Powerful high-current batteries: Nitecore 14500 with 3A continuous discharge and 7A surge, no premature cutoff during sustained continuous shooting, unlike the previous Keeppower cells, which shut off at approx. 2A.
• Double the capacity, half the weight: significantly more shots per charge than with the original NiCd batteries, at around half the weight.
• All three fuses included, plus a storage box: 0.8A, 1.0A and 1.25A (slow-blow glass fuses). You fit the one that matches your model, the others stay stored away.
• Snap-hook changing: secure hold in the battery compartment, quick swapping without tools.

Safety notes

Important: Never charge the batteries in the camera's original charger. Only use the USB-C ports on the cells.

Compatibility

The battery adapter v2 is designed for the Rolleiflex 6000 series. Which fuse goes into your camera depends on the model. All three fuses are included, and you fit the one that matches your model yourself using the table.

Fuse	Compatible cameras
0.8A (medium time-lag)	Rolleiflex SLX Rolleiflex 6006
1.0A (medium time-lag)	Rolleiflex 6006 Multi Exposure (also: 6006 model 2) Rolleiflex 6002
1.25A (slow-blow)	Rolleiflex 6001 Rolleiflex 6001 Professional Rolleiflex 6003 Rolleiflex 6003 Professional Rolleiflex 6003 SRC 1000

Not compatible with the 6008 series (6008, 6008 Professional, 6008 Professional SRC 1000, 6008 i, 6008 i2, 6008 E, 6008 AF, 6008 Integral, 6008 Integral 2). This version of the adapter does not run reliably on these cameras. We are working on a new version that should also work on the 6008. If you want to be notified as soon as it is ready, sign up for our newsletter.

Special case, not tested by us:

• Rolleiflex 6001 RCC

This model uses a NiCd voltage sensing circuit in the camera electronics, which has historically had detection problems with Li-ion cells. We have not tested the v2 adapter with it ourselves. The new high-current board may solve the problem partially or completely, but we cannot guarantee it. If you own a 6001 RCC and want to try it: drop us a quick message beforehand. We will discuss the chances of success and offer a generous return if it does not work.

Shipping note (important for international customers)

Due to regulations on shipping lithium-ion batteries, shipping depends on the scope of delivery (regardless of the selected surface, Smooth/Ribbed):

• Complete set (with 3x Nitecore batteries + charging splitter): shipping within Germany only.
• Cage only (with charging splitter, without batteries): worldwide shipping. You buy the three Nitecore NL1411R batteries separately in your country; you'll find all sources further down in the scope of delivery.

Choose your surface: Smooth or Ribbed

The adapter is available with two surfaces, technically identical and fully compatible; the difference is purely visual. The visible outer side becomes part of the left side panel of your Rollei (where the battery sits). Depending on the model generation, this panel is smooth or finely ribbed, so choose the surface that matches it flush.

• Ribbed. The proven version with a fine grooved texture. It picks up the design of the 6006 and looks most consistent there.
• Smooth, new, flat surface without grooves. Usually the right choice for the SLX, 6001, 6002 and 6003, whose original battery sits flush and flat.

Not sure? Just send us a photo of the left side of your camera body (where the battery is inserted). We'll tell you within a minute which surface fits flush. Function and scope of delivery are identical for both versions; the choice is purely visual.

Scope of delivery

Variant "Complete set" (with batteries):

• 1× battery cage v2 with high-current circuit board (gold-plated contacts)
• 3× Nitecore 14500 1100mAh Li-ion battery (USB-C port, status LED, 3A continuous discharge)
• 1× USB charging splitter (charges all batteries simultaneously)
• 1× fuse set in storage box: 0.8A, 1.0A, 1.25A (slow-blow glass fuses, IEC 60127)
• 1× quick start guide (DE/EN)

Variant "Cage only" (without batteries):

• 1× battery cage v2 with high-current circuit board (gold-plated contacts)
• 1× fuse set in storage box: 0.8A, 1.0A, 1.25A (slow-blow glass fuses, IEC 60127)
• 1× USB charging splitter (charges all batteries simultaneously)
• 1× quick start guide (DE/EN)

The charging distributor is included; you only need to get the batteries separately. We recommend the Nitecore NL1411R (1100mAh, 14500 format, USB-C, 3A continuous / 7A surge). You need 3 of them. Other 14500 USB-C cells with ≥3A continuous discharge will technically work as well, but have not been tested by us. Any USB-C cable or multi-charger will do for charging.

Where can you get the Nitecore NL1411R?

• Official Nitecore Store (USA, worldwide shipping): nitecorestore.com/products/nitecore-nl1411r
• Battery Junction (US Li-Ion specialist): batteryjunction.com/products/nitecore-nl1411r
• Amazon.com (USA): amazon.com search "nitecore NL1411R"
• eBay (worldwide shipping): ebay.com search "nitecore NL1411R"
• Nitecore UK (United Kingdom): nitecore.co.uk, does not ship individual batteries to Northern Ireland, the Channel Islands, the Outer Hebrides or the Scottish Highlands
• Selected Lights (Germany, also ships to other EU countries): selected-lights.de
• Armed (Czech Republic, ships to almost all EU countries): armed.eu
• Elsewhere in the EU/UK: Search your local Nitecore dealer or a specialist battery shop for “NL1411R 14500 USB-C”

Technical details

• Cage material: Engineering plastic
• Circuit board: v2 high-current PCB with gold-plated contacts
• Battery cells (Complete variant): 3× Nitecore NL1411R 14500 Li-Ion, 3.6V nominal, 1100mAh, 3A continuous discharge, 7A surge
• Energy per pack: approx. 12 Wh (complies with UN3481 Section II)
• Charging port: USB-C directly on each cell, integrated BMS
• Fuses: Set of 0.8A / 1.0A / 1.25A (slow-blow glass fuse, IEC 60127), storage box
• Colour: Black

Description

For the Rolleiflex SLX, 6006 and their sister models, this adapter replaces the old NiCd battery with three Nitecore 14500 Li-Ion cells that you charge individually via USB-C, giving you significantly more shots per charge at around half the weight. Compatible with Rolleiflex SLX, 6001, 6002, 6003 and 6006, not with the 6008 series; the fuse set for all compatible models is included.

The high-current circuit board with gold-plated contacts cleanly transmits even short current peaks without the fuse misreading them as a continuous load. This solves the most common remaining problem with old cameras: when gummed-up motors started up, micro-trips used to occur that blew the fuse prematurely, while it still protects against genuine continuous-load faults.

Which 14500 battery? Our comparison

We recommend the Nitecore NL1411R for the adapter, and not based on gut feeling. Before we settled on it, we tested several 14500 cells in the cage: Keeppower P1413TC, Keeppower P1450C4, Fenix ARB-L14, Manker 14500 (920 mAh) and various cheap no-name cells from Amazon.

Cell	Capacity	USB charging port + protection (BMS)	Continuous current (manufacturer's specification)	Max. pulse/surge current (manufacturer's specification)
Nitecore NL1411R (our pick)	1100 mAh (3,96 Wh)	USB-C, yes	3 A	7 A, specified
Keeppower P1413TC	1300 mAh	USB-C, yes	2,0 A	not specified
Keeppower P1450C4	1500 mAh	no USB port (charge externally), yes	no manufacturer specification	not specified
Fenix ARB-L14-1600U	1600 mAh, but only 1,5 V (regulated)	Micro-USB, yes	none	not specified
Manker 14500 USB-C	920 mAh (3,4 Wh)	USB-C, yes	no manufacturer specification	not specified
Various no-name (Amazon)	highly variable, often overstated	some with USB-C, BMS unclear	usually no datasheet	not specified

Note on the Fenix ARB-L14-1600U: This USB variant only outputs 1.5 V internally (regulated to AA voltage via a DC/DC converter), so it is not suitable for our 3-pack with 3.6 V cells (11.1 V combined). With Fenix, make sure you get a genuine 3.6 V 14500 cell.

The deciding factor is the maximum pulse/surge current. When firing, during mirror slap and at motor start, the Rollei draws short, strong current spikes, so what counts is the short-term surge current, not just the continuous current. The Nitecore NL1411R is the only cell in the test whose manufacturer even specifies this value: 7 A short-term. The official Nitecore distributor in Germany (KTL) confirmed this to us as well:

“The NL1411R can briefly deliver a surge current of 7A, which the Manker probably cannot. The technical specification of the ‘maximum pulse current’ or ‘overcurrent protection current’ is decisive here, but actually irrelevant for the standard customer. For very specialised enquiries, the latter specification can be looked up in the data sheet of most cells. That is why such a figure is rarely found online, though.”

USB charging port means: protection circuit (BMS) on board. Every 14500 cell with its own USB charging port comes with a small protection circuit (often called “BMS”). It sits between the cell and the contacts and protects against deep discharge, overcharging and voltage spikes. That is exactly what you want in 30-year-old camera electronics. Simple 14500 Li-ion cells without a protection circuit work too. They are often cheaper and sometimes deliver higher maximum currents, because the current does not have to pass through the small board first. The catch: no protection against deep discharge or voltage spikes. We recommend protected cells with a USB charging port; unprotected ones are for tinkerers who know exactly what they are doing.

Why this battery is safe

• Three individual batteries, no series charging: Each cell is charged individually via its USB-C port. This eliminates the main risk of poor DIY adapters (overvoltage, fire hazard due to missing balancing).
• BMS in every cell: Protection against overcharging, deep discharge and overheating, integrated directly into the Nitecore cell.
• Model-specific fuse: The slow-blow glass fuse matching your model protects the camera board against real faults (short circuit, component failure).
• High-current board v2: Separates surge currents (short, normal load peaks) from continuous load (real faults). This keeps the protection intact without the fuse falsely tripping during normal operation.

Background

You can find detailed background on the battery problem of the Rolleiflex 6000 series (myths vs. facts, the real cause of electronics damage, a comparison of all solutions: NiCd, NiMH, Li-ion) in our guide article on the Rolleiflex 6000 battery problem.

Suitable for various cameras, including:

Rollei: Rolleiflex 6002, Rolleiflex 6006, Rolleiflex SLX [...]

Not sure whether the battery fits your camera? Here is a complete list of all cameras that the RFX6000 battery type fits.

Frequently asked questions

“What to do if the fuse blows in continuous mode?”

If your camera blows the fuse in continuous mode with the correct fuse installed (see compatibility table above), this is almost always a sign of gummed-up grease inside the camera: the focus motor, mirror and shutter then draw considerably more current than intended by the factory. Recommendation: plan a service (CLA) with a specialised workshop such as Wiese Fototechnik. This also includes checking the ageing capacitors on the camera board, which are the most common real cause of failure in the 6000 series.

First, take a look at the installed fuse. If you previously had a lower rating in there, the filament may have broken long ago. That then looks like a power problem, but is just a blown fuse. Hold it up to the light: a continuous filament means it is fine.

As a temporary solution at your own risk you can use the next higher fuse rating (e.g. 1.0A instead of 0.8A for an SLX). This slightly reduces the level of protection: in the event of a fault, the fuse blows later, which in the worst case can affect the camera board. Acceptable for a transition period until the service appointment, not recommended permanently.