Power up your EDC gear with the Sunpower 2-pack of 20A 18650 2000mAh flat top batteries. Designed to deliver instant, sag-free current, these high-drain Li-ion cells are the perfect upgrade for turbo-mode flashlights, high-output headlamps, and personal desk fans that demand a reliable burst of power. The flat top positive terminal ensures a secure fit in multi-cell packs and flat-contact devices. Despite their aggressive 20A continuous discharge rating, they are equally at home in low-drain gadgets like solar lights and wireless electronics, providing consistent voltage throughout the cycle. Built without a protection circuit board, these bare cells require a smart Li-ion charger and must be used in devices with low-voltage cut-off. Recharge them hundreds of times, leave the memory effect behind, and keep your everyday torches and fans roaring with Sunpower.
Key Features
-
Turbo-Ready 20A High Drain – Low internal resistance and true 20A continuous discharge capability keep your flashlight's turbo/strobe mode blazing without voltage sag or step-down.
-
Optimized 2000mAh Capacity – Strikes a balance between high current delivery and usable runtime. Ideal when discharge power matters more than ultra-long endurance.
-
Flat Top Design – Standard flat positive terminal for battery packs, sleds, and flashlights with flat contacts. Note: verify your device accepts flat tops; some single-cell lights require button tops.
-
Rechargeable & Cost-Effective – Cycle life over 500 charges, replacing hundreds of disposables. Zero memory effect – top up anytime.
-
Unprotected Cell – Know Your Gear – These cells do not include a protection circuit (PCB). You must use a dedicated Li-ion smart charger and a device with built-in over-discharge protection or add an external protection board. Recommended for users familiar with lithium-ion safety.
-
Compact & Portable – Standard 18650 dimensions (18.3 mm x 65.0 mm), weighing approximately 45 g per cell.
Technical Parameters
| Parameter | Specification |
|---|---|
| Brand | Sunpower |
| Model | 18650 |
| Chemistry | Li-ion (High Drain) |
| Nominal Voltage | 3.7 V |
| Charging Voltage | 4.2 V ±0.05 V |
| Discharge Cut-off Voltage | 2.5 V |
| Rated Capacity | 2000 mAh (0.2C discharge) |
| Max Continuous Discharge | 20 A |
| Max Pulse Discharge | 35 A (<1 s) |
| Positive Terminal | Flat Top |
| Protection Circuit | None (unprotected) |
| Cycle Life | ≥500 cycles to 80% capacity |
| Dimensions | (18.3±0.2) mm x (65.0±0.2) mm |
| Weight | ~45 g per cell |
Applications
-
EDC & Tactical Flashlights – Engineered for EDC torches and tactical lights that rely on turbo and strobe modes. Delivers stable high current where lower-drain cells would sag.
-
High-Output Headlamps – Perfect for caving, night hiking, and industrial headlamps demanding sustained brightness.
-
Desk Fans & Portable Coolers – Powers personal desk fans smoothly, ensuring instant motor start and consistent speed even under partial charge.
-
RC Toys & DIY Packs – Great for building custom 2S/3S packs for RC cars, drones, and hobby robotics.
-
Solar Lights & Small Electronics – Reliable replacement for garden solar lights, wireless mice, multimeters, and Arduino projects.
FAQ
Q: What does "Turbo-Ready" mean for my flashlight?
A: It means these Sunpower 20A cells can handle the high current demand of turbo/strobe modes without triggering low-voltage protection or sudden dimming, unlike standard 5A–10A batteries.
Q: Are these batteries protected?
A: No. They are unprotected flat top cells. You must use a Li-ion smart charger and a device that has low-voltage cut-off, or add a protection circuit. Never over-discharge below 2.5V.
Q: Will a 20A battery damage my desk fan or low-power device?
A: No. The device draws only the current it needs. The 20A rating is the safe maximum output. These batteries work perfectly fine in low-drain electronics.
Q: Flat top vs. button top – will they fit my torch?
A: Flat tops fit flashlights with flat terminals or multi-cell trays. If your torch uses a mechanical reverse-polarity ring that requires a button top, flat tops may not make contact. Use a magnet spacer only with extreme caution to prevent short circuits.
Q: How should I store and maintain these cells?
A: Store at approximately 3.7V in a cool, dry place. Recharge every 6 months. Use non-conductive cases and never carry loose in pockets with metal objects.
