XTAR 21700 5500mAh USB-C Rechargeable Li-ion Battery — a high-capacity, protected 21700 cell that charges straight from a USB-C cable, no separate charger needed. Up to 15A of discharge makes it a strong match for dive lights and other high-drain 21700 devices.
- 🔋 5500mAh high capacity — longer runtime between charges, at 3.6V nominal
- ⚡ 15A max discharge — strong output, with 12A continuous for reliable long-term performance
- 🔌 USB-C charging — charge from a wall charger, car charger, laptop or power bank with a standard USB-C cable
- ⏱️ About 3.2 hours to full — the indicator flashes green while charging and turns solid green when full
- 🧠 Intelligent 3-stage charging — looks after battery health over the long term
- 🔄 Auto reactivation — recovers from over-discharge protection and resumes charging when plugged in
- ♻️ 500+ cycles — recharge more, replace less
- 🌡️ Wide temperature range — operates from -20°C to 60°C
- ✅ Overcharge protection
- ✅ Over-discharge protection
- ✅ Overvoltage protection
- ✅ Overcurrent protection
- ✅ Short-circuit protection
- ✅ Temperature protection
- 🤿 Diving lights
- 🔦 Tactical flashlights
- ⛑️ Headlamps
- 💨 Portable fans
- 🔋 Other 21700-compatible devices — button-top, φ21.5 × 76.5mm
XTAR 21700 5500mAh USB-C Rechargeable Battery 15A
S$30.00
Specifications
In-stock orders are usually processed the same working day. If an item isn’t on the shelf, we replenish it — typically within 2–4 days — and send your order out the moment it arrives.
Made-to-order gear, such as certain Nauticam ports and extensions, takes longer — we’ll confirm the lead time with you before you commit.
Need it urgently? Tell us before you place the order and we’ll be honest about what we can commit to.
We don’t sit on orders. If something unforeseen slows yours down — a stock gap, a courier hiccup — we’ll tell you early and do our best to put it right.
We ship within Singapore by courier and worldwide via tracked international services. Import duties and local taxes are the responsibility of the recipient.
Products carry their manufacturer’s warranty (Nauticam, AOI, Kraken and others). If you run into an issue, reach out and we will help you with the claim.
For warranty claims and servicing, submit a repair request — or see how the process works on our equipment repair service page.
If we sent the wrong item or it arrived faulty, contact us and we will make it right.
Full details are on our FAQ page.



















