21700 Battery from Golisi
Maximize performance with 21700 batteries from Golisi – ideal for various devices, tools, and outdoor applications. TÜV-tested, safe, and durable. Discover more battery formats under batteries.
21700-BatteryCDR 15A / Max 25A5000mAh nominalReached the maximum The L50 battery is the endurance champion among the 21700 style batteries and is designed for projects that require lower performance. With a whopping 5000mAh capacity, it is not so easy to get down with a maximum output of 55.5-45 watts and, with its constant output power of 15A, it ensures that your project doesn't run out of juice so quickly up to a battery level of less than 30%! Battery safety At Golisi, special emphasis is placed on longevity and safety. The L50 is characterized by its exceptionally robust construction, which is already visible from the outside. An additional thick cover protects it if it accidentally falls. This design also delays the insertion and removal of the battery from chargers, which can normally lead to rapid wear of the heat shrink tubing at the ends. Aside from that... The L50 battery is designed for long-term use and keeps its promise of reliable and safe energy delivery, even with a life cycle of over 800 charging cycles. Packaging that consists of 99.9% recyclable materials and contains no air also makes the “surroundings” a useful addition. In addition, with each L50 battery you will receive a battery transport box for two 20700/21700 batteries. Please never transport your batteries loosely and always use a transport box. DetailsBattery type: IMR 21700 Nominal Capacity: 5000mAh Constant discharge current: 15 amps Nominal voltage: 3.7 volts Discharge voltage: 2.5 volts Charging voltage: 4.20±0.05 volts Internal resistance: 28mΩ Standard charging technology: CC/CV (<=2A) Lifespan: >800 charging cycles Working temperature charging: 0 - 45°C Working temperature unloading: -20 - 60°C Storage temperature: room temperature Size (Height x Diameter): Approx. 70mm x 21mm Weight: Approx. 86g Safety: CE, FCC, MSDS, WEEE, UN38.3, IEC62133 drop test Scope of delivery 1x Golisi L50 battery including battery transport box Safety instructions Keep this battery away from fire and water! Do not use this battery outside the specified temperature ranges. Children should not use this product without parental supervision. Li-Io cells should only be operated with protective electronics. Incorrect use or short circuit can lead to fire or explosion. Check your batteries regularly for damage. Immediately stop using batteries with deformations such as dents or bumps or damage to the insulation. If necessary, please feel free to ask us.
21700 batteryCDR 30A / Max 40A4000mAh nominal More is simply not possible The Golisi S35 battery meets the demands of increasingly powerful energy suppliers and is our offer on the 21700 battery market. With a size of 21x70mm (diameter x height) and a weight of 46g, it is still interesting for more compact applications and delivers top values! A constant output power of 30A and peaks of up to 40A ensure appropriate performance and safety. A powerful battery with a strong 3750mAh capacity ensures long-lasting use until the next charge. Wow In the upper range of power output, 111 to 90 watts at 30A are no problem for the S35. The S35 battery maintains this power through an efficient design down to a capacity of 40% before it slowly collapses. In lower ranges, it always amazes with a view of the full 3750mAh endurance if it still doesn't have to be connected to the mains. In addition, the S35 can be charged more often - Up to 800 charging cycles guarantee a long service life in connection with the large battery. Battery safety All Golisi batteries are developed with long and safe use in mind. The S35 has a particularly robust design that starts on the outside. An extra thick casing secures it should it fall down. This also delays the insertion and removal of the battery from chargers, which is known for rapid wear of the shrink tube, especially at the ends. Inside, an integrated short-circuit protection serves as an additional security guarantee. And otherwise? Numerous investigations and tests certify the Golisi S32's specifications and our claim. A packaging that consists of 99.9% recyclable materials and does not contain any air also makes the "trappings" a useful addition. In addition, you will receive a battery transport box for two 20700/21700 batteries with each S35 battery. Please never transport your batteries loose and always use a transport box. Details Battery type: IMR 21700 Nominal capacity: 3750 mAh Constant discharge current: 30 Ampère Nominal voltage: 3,7 Volt Discharge voltage: 2,75 Volt Charging voltage: 4,20±0,05 Volt Internal resistance: 30mΩ Standard charging technology: CC/CV (<=2A) Charging time: Approx. 1.5 hours (with Golisi charger) Lifespan: >800 charge cycles Working temperature charging: 0 - 45°C Working temperature discharging: -20 - 60°C Storage temperature: room temperature Size (height x diameter): Ca. 70mm x 21mm Weight: Ca. 46g Safety: CE, FCC, MSDS, WEEE, UN38.3, IEC62133 Drop test Scope of delivery 1x Golisi S35 battery including battery transport box Safety instructions Keep this battery away from fire and water! Do not use this battery outside of the specified temperature ranges. Children should not use this product without parental supervision. Li-Io cells should only be operated with protective electronics. Incorrect use or short-circuiting can result in fire or an explosion.
21700 Batteries by Golisi: powerful, safe, and long-lasting cells in the Ø 21 mm × L 70 mm format – direct from the manufacturer, sustainably packaged and including a carrying case for safe handling on the go.
Why Golisi 21700 Batteries?
Our 21700 cells combine high energy density with robust safety and realistic performance specs. Whether you need maximum runtime or high continuous load – Golisi has the right 21700 cell for demanding projects, portable power, photo/video, DIY, and modeling.
Technical Data of 21700 Batteries & Differences
Size, Voltage & Capacity
"21700" describes the format: Ø 21 mm × 70 mm (cylindrical). Typical specs: nominal voltage 3.7 V, charge cut-off voltage 4.2 V ±0.05, discharge cut-off voltage approx. 2.5–2.8 V depending on the model. In this category you'll find 21700 batteries with 4,000 mAh and 5,000 mAh.
- L50 21700 Battery – 5,000 mAh nominal, CDR 15 A / Max. 25 A: the endurance champion for moderate power draws.
- S35 21700 Battery – 4,000 mAh nominal, CDR 30 A / Max. 40 A: a high-current specialist with strong performance.
Construction, Safety & Quality
Golisi relies on particularly robust cell construction with a thicker outer casing for long-term durability – even with frequent insertion/removal. All 21700 batteries are supplied with a carrying case. Safety instructions for handling and storage can be found in the product details.
Lifespan, Charge Cycles & Care
Depending on usage profile, Golisi 21700 batteries achieve several hundred charge cycles. Lifespan factors include temperature, charge/discharge rate, and storage conditions.
- Practical tips: where possible, operate between 20–80%, avoid high temperatures, and use suitable chargers with CC/CV.
- Storage: cool/dry, approx. 3.6–3.7 V storage voltage, always in the carrying case.
Applications & 21700 Battery Recommendations
Flashlights, Photo/Video, DIY/Modeling, Portable Power
Choose according to your load profile and goal:
- Maximum runtime at moderate load: L50 5000 mAh, 15 A CDR
- High current & performance: S35 4000 mAh, 30 A CDR
21700 vs 18650: Which Battery Type Suits You Better?
Both formats are Li-ion round cells but differ in size and performance profile. Here are the key points:
| Property | 21700 Battery | 18650 Battery |
|---|---|---|
| Dimensions | Ø 21 mm × 70 mm | Ø 18 mm × 65 mm |
| Energy Density / Capacity | typically higher (4,000–5,000 mAh) | usually 2,200–3,500 mAh |
| High-Current Capability | very good (e.g. S35: 30 A CDR) | very good (e.g. S26/S30) |
| Thermal Management | larger volume – better heat dissipation | more compact – heats up faster |
| Device Compatibility | only for devices with 21700 slots | standard format, very widely used |
| Conclusion | More runtime and power, if 21700 fits | Compact and established – for many standard devices |
Quick recommendation: If your device supports 21700 and you need more runtime or more headroom under load, 21700 is the right choice. For maximum compatibility, 18650 remains the more flexible option.
Golisi 21700 Battery Comparison
The most important specs at a glance – for quick selection by capacity, continuous/peak current, and use case:
| Model | Capacity (mAh) | Continuous Current (A) | Peak Current (A) | Recommendation / Use Case |
|---|---|---|---|---|
| L50 | 5000 | 15 | 25 | Endurance champion at moderate load |
| S35 | 4000 | 30 | 40 | High-current applications with strong performance |
Suitable Chargers for 21700 Batteries
- Golisi Needle – single-slot, automatic & compact.
- Golisi I4 – 4-slot, display & intelligent charging.
- Golisi I6 – 6-slot, quick charge, 3×2 A or 6×1 A.
- All Golisi chargers are compatible with 21700 batteries.
Tip: Put together your own 21700 battery + charger set in the shop – safe, matched, and convenient.
Frequently Asked Questions About 21700 Li-Ion Batteries
What exactly does "21700 battery" mean?
The designation stands for the round cell format 21 mm × 70 mm. 21700 cells are larger than 18650 and offer, depending on the model, more capacity or more current reserve.
Is there a 21700 battery "test winner"?
"Test winner" is not an official standard. What matters are realistic capacity values, continuous/peak current, and safety certifications. At Golisi, all technical specifications are verified.
Are there 21700 batteries with 7000 mAh?
Currently, real, tested capacities of high-quality 21700 batteries are in the range of 4,000–5,000 mAh. Values around 7,000 mAh are currently technically almost unattainable – so watch out for reputable manufacturer specs.
Can I use any 21700 battery in my device?
Not always. Check the device's format compatibility, discharge current, and protection electronics. If the specs match, choose capacity and CDR to suit your load profile.
How do I charge and store 21700 batteries correctly?
- Charger: use an intelligent CC/CV charger (e.g. Golisi I4/I6).
- Charging temperature: room temperature, no heat or frost.
- Storage: approx. 3.6–3.7 V, cool/dry, always in the carrying case.
What should I do if there's damage (heat shrink, dents)?
Do not continue using damaged cells. Have the heat shrink sleeve replaced or safely remove the cell from use and dispose of it properly. Always use the included carrying case for transport and storage.