As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.
A 16340 is a size class, not a voltage promise. Most rechargeable RCR123A cells use lithium-ion chemistry at 3.6 or 3.7V nominal and reach 4.2V when fully charged; that is not automatically safe in a device designed only for a 3V disposable CR123A. A regulated 3V rechargeable cell is a separate product. Measure the battery compartment as well: protected circuits, button tops, and USB-C charging ports can make a 16340 longer than an unprotected flat-top cell. Use only the exact chemistry, nominal voltage, terminal style, and maximum length specified by the device maker. Do not force a cell or substitute based on the 16340 label alone.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Orbtronic 16340 RCR123A Protected 920mAh | $7.99 | Amazon |
| 2 | Keeppower P1634TC 3V 1000mAh | $8.99 | Amazon |
| 3 | Fenix ARB-L16-800UP | $11.95 | Amazon |
| 4 | Sofirn 16340 Button Top 800mAh | $5.90 | Amazon |
| 5 | Vapcell T9 16340 950mAh 3A | $11.99-$51.95 | Amazon |
| 6 | Nitecore NL169 16340 950mAh | $9.95 | Amazon · eBay |
| 7 | Nitecore NL169R USB-C 16340 950mAh | $10.95 | Amazon · eBay |
| 8 | Nextorch DC20061 USB-C 16340 800mAh | $14.99 | Amazon |
The picks, in detail
Orbtronic 16340 RCR123A Protected 920mAh
Orbtronic’s protected button-top RCR123A is a 3.7V Li-ion cell, so use it only where the device explicitly permits 3.7V nominal and 4.2V charged voltage. At 34 mm long and 16.5 mm wide, it is shorter than several USB-C protected alternatives.
- Li-ion, 3.7V nominal; 4.2V full charge
- 920mAh nominal capacity; 3A maximum discharge
- 34 mm length, 16.5 mm diameter
- Welded button top and integrated protection
- Explicit 34 mm length helps check compartment clearance
- Protected circuit and button terminal are specified
- Live manufacturer stock at $7.99 each
- Not for a device limited to 3V CR123A cells
Keeppower P1634TC 3V 1000mAh
P1634TC is the distinct regulated 3.0V option in this list, aimed at equipment that calls for a rechargeable 3V RCR123A rather than a 3.7V Li-ion output. Its built-in USB-C port and protection add length, so check its 35 mm maximum length before buying.
- Regulated 3.0V nominal output
- 1000mAh nominal; 2A maximum continuous discharge
- 16.8 mm diameter, 35.0 mm maximum length
- Protected button top with USB-C charge port
- 3.0V output differs materially from ordinary 3.7V cells
- USB-C charging removes the need for a separate charger
- Current retailer listing is $8.99
- 35 mm body can be too long for short battery tubes
Fenix ARB-L16-800UP
Fenix’s ARB-L16-800UP is a protected 3.6V 16340 with USB-C charging built into the cell. It measures 35 mm by 16.7 mm, so its length and button top must be confirmed against the device specification rather than assumed from its 16340 designation.
- Li-ion 16340, 3.6V nominal
- Fenix-rated 800mAh nominal capacity
- 35 mm length and 16.7 mm diameter
- Button-top protection circuit plus USB-C port
- Built-in USB-C charging is specific to this model
- Fenix publishes both dimensions and charging current
- Official Fenix price is $11.95
- Not interchangeable with a device that permits only 3V CR123A cells
Sofirn 16340 Button Top 800mAh
Sofirn’s button-top 16340 is a compact 3.7V Li-ion choice with a 34 mm listed height. The live seller lists 700-750mAh actual capacity rather than the 800mAh product title, so this entry uses the stated specification instead of treating the title as a tested capacity claim.
- Li-ion 16340 with 3.7V nominal voltage
- 34 mm height and 16.6 mm diameter
- Button-top terminal
- Seller states 700-750mAh actual capacity
- Shorter listed height than 35 mm USB-C cells
- Current in-stock price is $5.90
- Button top is explicit rather than inferred
- No protection circuit is stated on the seller listing
Vapcell T9 16340 950mAh 3A
Vapcell T9 is an INR 16340 with a flat top, 3.6V nominal voltage, and a 3A maximum continuous-discharge specification. Its 34.0 mm length makes it a different fit proposition from protected button-top cells, but it still requires a device rated for Li-ion voltage.
- INR chemistry; 3.6V nominal voltage
- 950mAh typical and 820mAh minimum capacity
- 3A maximum continuous discharge
- Flat top; 16.4 mm by 34.0 mm
- Flat top and 34 mm length suit a different compartment than USB-C cells
- Manufacturer lists both typical and minimum capacity
- Manufacturer store lists a two-pack from $11.99
- Flat top may not contact equipment designed for a button top
Nitecore NL169 16340 950mAh
The standard NL169 is a 3.6V, 950mAh Li-ion 16340 intended for an external charger. Nitecore publishes a 34.1 mm length, 16.6 mm diameter, and 2A continuous-discharge limit, allowing a direct clearance check before it goes into a tightly sized compartment.
- Li-ion NMC chemistry, 3.6V nominal
- 950mAh / 3.42Wh nominal rating
- 34.1 mm length, 16.6 mm diameter
- 2A continuous-discharge specification
- External-charger design avoids the added USB-C port length
- Dimensions are published to tenths of a millimetre
- B&H lists it in stock at $9.95
- Requires an appropriate external Li-ion charger
Nitecore NL169R USB-C 16340 950mAh
NL169R keeps Nitecore’s 3.6V, 950mAh Li-ion rating but adds a USB-C port and protection circuit. That convenience changes the physical length to about 36.3 mm, which is the key reason to check clearance instead of treating it as the same fit as the 34.1 mm NL169.
- Protected 3.6V Li-ion 16340
- 950mAh capacity and 2A maximum discharge
- USB-C charging port and button top
- 36.3 mm length and 16.5 mm diameter
- USB-C charging is built into the battery
- Protection addresses overcharge, deep discharge, and short circuit
- Battery Junction lists it in stock at $10.95
- Longer than the non-USB NL169 by about 2.2 mm
Nextorch DC20061 USB-C 16340 800mAh
Nextorch DC20061 is a protected USB-C 16340 rated at 3.6V and 800mAh. Its 35 mm length and 16.8 mm diameter need a compartment check, and its 3.6V Li-ion output must be authorized by the device maker before it replaces any 3V CR123A.
- DC20061 has triple protection and a USB-C charge port
- Nextorch states an 800mAh nominal capacity
- USB-C port with charge-status LED
- 16.8 mm diameter and 35 mm length
- Built-in USB-C charging and protection are both specified
- Dimensions are published for fit checking
- Nextorch lists it at $14.99
- Wider than many 16.5 mm 16340 cells
Buying tips
- Read the device manual for allowed nominal voltage before selecting a 3.6/3.7V Li-ion cell.
- A fully charged 3.6/3.7V Li-ion 16340 reaches about 4.2V; it is not a 3V CR123A equivalent.
- Measure the compartment length: USB-C and protected cells can be 35-36.3 mm long.
- Match button-top or flat-top terminals to the device contact design.
- Use a protected cell only if its added length fits; protection does not make an incompatible voltage safe.
- Charge only with the method and charge voltage stated for that exact battery model.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.