【Overview】
Maximize your device's runtime with the Samsung 35E 18650 Battery (Model: INR18650-35E). Renowned for its exceptional capacity, this 18650 lithium-ion cell delivers an impressive 3500mAh of reliable energy—one of the highest capacities available in the 18650 format.
With a stable 8A continuous discharge (short pulse up to 15A), it is perfectly suited for devices that prioritize long runtime over extreme power output. The 35E is the "King of Runtime", offering up to 40% more battery life than standard 2500mAh cells (like the 25R) and 17% more than 3000mAh cells (like the 30Q).
This listing offers five terminal options to suit your specific needs: Flat Top for most modern devices (flashlights, DIY packs, e-bikes); Button Top for older equipment with spring-loaded contacts; Nickel Tab – pre-welded with nickel strips for easy, solder-free DIY battery pack assembly; Protected Top for added safety; and Pre-wired Leads for plug-and-play replacements.
( Please note: For Protected Top and Pre-wired versions, the battery length will increase by 1-2mm. Please check your device's bay depth!)
【Key Features】
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Ultra-High Capacity (3500mAh): Delivers 3500mAh of reliable capacity, offering up to 40% more runtime than standard 2500mAh cells and 17% more than 3000mAh cells.
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Stable 8A Continuous Discharge: Provides consistent 8A current, ideal for high-lumen flashlights, camping gear, e-bikes, and portable power stations. Supports short pulse discharges up to 15A.
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5 Terminal Options: Flat Top (standard), Button Top (spring-loaded), Nickel Tab (for DIY packs), Protected Top (with safety circuit) or Pre-wired Leads (direct replacement).
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Long Runtime Focus: Engineered specifically for devices that need to run for hours or days without recharging.
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Authentic Samsung Quality: Premium-grade cells from one of the world's most trusted battery manufacturers.
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Versatile Performance: Suitable for a wide range of long-run applications, from high-power flashlights to e-bikes and DIY battery projects.
【Technical Parameters】
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Brand & Model: Samsung INR18650-35E
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Battery Type: Lithium-Ion (Li-Ion)
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Size: 18650 (Diameter 18mm, Height 65mm)
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Capacity: 3500mAh (Minimum 3400mAh)
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Nominal Voltage: 3.6V
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Full Charge Voltage: 4.2V
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Cut-off Voltage: 2.5V
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Continuous Discharge Current: 8A
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Pulse Discharge Current: Up to 15A (short pulses only, not for continuous use)
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Terminal Options: Flat Top / Button Top / Nickel Tab / Protected Top / Pre-wired with Leads (select at checkout)
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Internal Resistance: ~25-30mΩ (Typical)
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Protection Circuit: No (Unprotected Cell) / Optional Protected Top version
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Operating Temperature: -20°C to 60°C
【Model Comparison Table】
【Applications】
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High-Lumen Flashlights & Headlamps: Powering tactical flashlights and searchlights for extended periods.
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Portable Power Banks: Building high-capacity banks for charging phones and tablets multiple times.
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Camping & Outdoor Gear: Running fans, LED lanterns, heated jackets, and other electronics for days.
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Electric Bikes (E-Bikes) / E-Scooters: Building battery packs for light e-bikes where maximum range is the priority.
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DIY Battery Packs: Creating custom 1S, 2S, 3S, or larger battery banks. The Nickel Tab option is perfect for solder-free assembly.
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Emergency Preparedness: Building backup power systems for emergency lights, radios, and essential devices.
【FAQ】
Q1: What is the difference between Flat Top, Button Top, and Nickel Tab?
A: Flat Top has a flat positive terminal, fitting most modern devices. Button Top has a raised positive terminal, required for older spring-loaded devices. Nickel Tab comes pre-welded with nickel strips on both terminals, ready for solder-free pack assembly. (Protected Top adds a safety circuit, and Pre-wired Leads are ready for direct replacement.)
Q2: What is the continuous discharge rating?
A: The official continuous discharge rating is 8A. Short-duration pulse discharges can reach up to 15A, but it is not designed for continuous 8A+ operation. For safety and longevity, we recommend staying within the 8A continuous limit.
Q3: How does Samsung 35E compare to Panasonic NCR18650GA?
A: Both have a similar capacity. The Panasonic GA has a slightly higher continuous discharge (10A vs 8A). The Samsung 35E is generally more affordable and widely available.
Q4: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 35E is an unprotected cell. It relies on the external device or a BMS to handle overcharge, over-discharge, and short-circuit protection. (We do offer a Protected Top option if you need built-in protection).
Q5: What charger should I use?
A: Use a dedicated intelligent Li-Ion charger designed for 3.6V/4.2V cells. Ensure the charger supports the correct voltage for your specific pack setup.
Q6: Is the Samsung 35E still a good battery in 2026?
A: Absolutely. The Samsung 35E remains a top choice for high-capacity, long-runtime applications. Its 3500mAh capacity is still among the best in class, and its reliability and safety are well-proven. It continues to be a favorite for flashlight enthusiasts, campers, and DIY battery builders.
Available now: Flat Top / Button Top / Nickel Tab / Protected Top / Pre-wired Leads. Not sure which terminal type your build needs? Reach out before ordering and we'll help you get it right the first time.
