Why This Bundle
High-drain batteries deserve a charger that can actually keep up with them. Overcharging, swelling, and no way to check cell health are the most common risks with mismatched charging setups. This bundle pairs genuine Samsung 25R Button Top cells with the XTAR VC8S smart charger, so you get a matched, ready-to-use setup right out of the box — no guesswork on compatibility or safety.
This listing is for Button Top. Looking for Flat Top? Click here to buy: Samsung INR18650-25R Flat Top + XTAR VC8S Bundle.
Samsung INR18650-25R (Button Top) Specifications
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| Item |
Spec |
| Model |
Samsung INR18650-25R (Button Top) |
| Rated Capacity |
2500mAh |
| Nominal Voltage |
3.6V |
| Max Continuous Discharge |
20A |
| Charge Cutoff Voltage |
4.2V |
| Chemistry |
NMC (Lithium Nickel Manganese Cobalt Oxide) |
| Cell Size |
18650 (approx. |
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Φ18.4mm × 65.3mm) |
Terminal Type |
Button Top — positive terminal has a raised nub, suited for devices requiring point contact |
Typical Use |
High-output flashlights, power tools, DIY battery packs, and other high-drain applications |
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Note: High-drain cells demand careful handling — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.
The Charger: XTAR VC8S
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8-bay Type-C LCD display with independent charging channels
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True Capacity Test (Grad.): charge–discharge–charge low-current analysis reveals the real capacity of each 25R cell, flagging degraded ones early
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Internal Resistance Test (IR): checks the health of every cell so you can pick out the best-performing ones for high-drain use
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Smart Recognition + Trickle-CC-CV: automatically applies the optimal charging curve for 25R cells
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PD Fast Charging: Type-C input, up to 3A on 2 bays with a 15V/3A power source
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Reverse-Polarity Protection + Over-Discharge Repair: dual safety features that extend battery lifespan
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5 Adjustable Current Levels: 3A / 2A / 1A / 0.5A / 0.25A to match different charging needs
VC8S Charger – Supported Battery Types & Voltage
Compatible battery length: 30–80mm
3.6V/3.7V Li-ion/IMR/INR/ICR batteries: 10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650 — including the Samsung 25R (18650) in this bundle (Charges batteries with or without a protection circuit board)
1.2V NiMH batteries: AAA, AA, A, SC, C (Note: Not compatible with 1.5V rechargeable lithium batteries)
Charge cutoff voltage: 4.20±0.05V (Li-ion) / 1.45±0.1V (NiMH)
Compatibility Notes
The VC8S uses a spring-loaded contact design, so both Button Top and Flat Top batteries fit without any adapter. Samsung 25R Button Top cells measure about 65.3mm, which sits comfortably within the VC8S's 30–80mm battery length range.
What's Included
- Samsung INR18650-25R Button Top Battery × 8
- XTAR VC8S Charger × 1
- User Manual × 1
- USB-C to USB-C Charging Cable × 1
- USB-A to USB-C Charging Cable × 1
This listing is for Button Top. For Flat Top click here
Safety Tips
- Store batteries in a proper case, keeping them away from loose metal objects to prevent short circuits
- Never disassemble, puncture, burn, or submerge the batteries
- Run a capacity test on the VC8S before first use to confirm each cell's condition
- These are high-drain cells intended for compatible, purpose-built devices — do not use them in unauthorized or modified equipment
FAQ
Q: Can the XTAR VC8S charge Samsung 25R Button Top batteries safely? A: Yes. The VC8S automatically recognizes Li-ion chemistry and applies a Trickle-CC-CV charging profile matched to 25R cells, with a 4.2V cutoff voltage.
Q: What's the difference between Button Top and Flat Top batteries? A: The only difference is the shape of the positive terminal — Button Top has a raised nub for point contact, while Flat Top is level. Capacity, voltage, and discharge rate are identical.
Q: Do I need an adapter to charge Button Top batteries in the VC8S? A: No. The VC8S's spring-loaded contacts accommodate both Button Top and Flat Top cells without any adapter.
Q: How many 25R batteries can I charge on the VC8S at the same time? A: All 8 bays can charge simultaneously. For faster charging (3A or 2A), fewer bays are used at once — see the current level table in the VC8S charger listing for details.
Q: How do I know if a 25R battery is degraded? A: Run the VC8S's Capacity Test (Grad.) mode. It performs a charge–discharge–charge cycle and displays the battery's true remaining capacity, making it easy to spot cells that have aged or lost performance.
Q: Is 20A continuous discharge safe for everyday devices? A: These are high-drain cells built for devices that specifically call for high continuous discharge, such as certain flashlights, and power tools. Always check your device's battery requirements before use.
Q: What's in the box? A: 8 Samsung INR18650-25R Button Top batteries, 1 XTAR VC8S charger, a user manual, a USB-C to USB-C cable, and a USB-A to USB-C cable.
