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17700 Charger – Dedicated Chargers for 17mm Diameter Specialty Li-ion/NiMH Cells, Precision & Safe Charging Management
Welcome to our 17700 Charger collection. The 17700 battery (approx. 17mm diameter × 70mm length) is a specialty-sized cylindrical cell available in both Li-ion and NiMH chemistries, positioned between the 17670 (~67mm) and 18650 (65mm length, but 18mm diameter). Li-ion versions feature a nominal voltage of 3.7V, full charge of 4.2V, and typical capacities ranging from 1400mAh to 2000mAh; NiMH versions feature a nominal voltage of 1.2V with capacities up to 3600mAh–4000mAh. Its unique combination of 17mm diameter and 70mm length places special demands on slider travel, negative terminal spring tension, and diameter compatibility. The 17700 is often used as a rechargeable replacement for two CR123A primary cells (one 17700 replaces two CR123As in series), widely applied in tactical flashlights, medical devices, digital cameras, e-cigarettes, and various portable electronic devices. This collection features high-quality chargers specifically designed for or perfectly compatible with 17700 cells—ranging from single-bay portable chargers to multi-bay digital chargers—ensuring your 17700 batteries are recharged in the safest, most efficient, and most precise manner.
17700 Battery Key Specifications
| Parameter | Li-ion | NiMH |
|---|---|---|
| Nominal Voltage | 3.7V | 1.2V |
| Full Charge Voltage | 4.2V | 1.45V–1.5V |
| Typical Capacity Range | 1400mAh – 2000mAh | 3600mAh – 4000mAh |
| Dimensions (Diameter × Length) | ~17.0mm × 70.0mm | ~17.0mm × 70.0mm |
| Recommended Charge Current | 0.3A – 0.5A | 0.1C – 0.2C |
| Weight | ~36g – 42g | ~46g – 56g |
Core Advantages of 17700 Chargers
- Perfect Size Compatibility with Secure Fit: 17700 cells are ~70mm long (about 5mm longer than 18650's 65mm) and ~17mm in diameter (slimmer than 18650's 18mm). All chargers in this collection feature robust negative springs or adjustable tension to ensure secure contact for slim cells, preventing charging interruptions or high contact resistance.
- Multi-Chemistry Auto-Detection: Chargers in this collection support automatic detection of both Li-ion (3.7V) and NiMH (1.2V) chemistries. Select professional models also support LiFePO₄ (3.2V) mode, ensuring each battery type terminates at the correct voltage to prevent overcharging.
- Precision Adaptive Charging Current: With typical capacities of 1400mAh–2000mAh (Li-ion), 17700 cells charge best at 0.3A–0.5A. These chargers support adaptive or manually adjustable currents to prevent damage from excessive current and extend battery lifespan.
- Smart Charging Management: Utilizes constant-current/constant-voltage (CC/CV) charging profile for Li-ion, or -ΔV/dT/dt termination for NiMH, with automatic battery state detection. Charging terminates precisely at the correct cut-off voltage, effectively preventing overcharging and ensuring battery safety. Some chargers can also automatically activate over-discharged batteries.
- Multiple Safety Protections: Built-in overcharge, over-discharge, overcurrent, short-circuit, reverse polarity, and overheat protection for comprehensive charging safety. Many chargers use fire-retardant materials and have passed multiple safety certifications.
- Protected Cell Compatibility: Protected 17700 cells can reach lengths of 71mm or more. Select chargers in this collection feature extended slider travel to accommodate protected 17700 cells perfectly.
- Independent Charging Channels: Multi-bay chargers control each slot independently—mix 17700, 18650, 21700, 16650, 17670, and other cell sizes with different charge levels without interference.
- LCD Digital Display: Real-time monitoring of charging voltage, current, accumulated capacity, and internal resistance—charging status at a glance.
17700 Charger vs. 17670 Charger vs. 18650 Charger
| Parameter | 17700 Charger (This Collection) | 17670 Charger | Standard 18650 Charger |
|---|---|---|---|
| Length Compatibility | 70mm (about 5mm longer than 18650) | 67mm (about 2mm longer than 18650) | 65mm |
| Diameter Fitment | 17mm slim cells need secure grip | 17mm slim cells need secure grip | 18mm standard |
| Chemistry Support | Li-ion / NiMH / LiFePO₄ (select models) | Li-ion / NiMH / LiFePO₄ (select models) | Primarily Li-ion |
| Protected Long Cell Compatible | ✅ Slider travel up to 72mm+ | ✅ Slider travel up to 70mm+ | ⚠️ Verify slider travel |
| Can Charge 17700? | ✅ Yes (dedicated or fully compatible) | ⚠️ Some models (verify slider travel) | ⚠️ Verify spring tension & slider travel |
| Supported Cells | 17700 / 17670 / 16650 / 18650 / 21700 / NiMH, etc. | 17670 / 17650 / 16650 / 18650, etc. | 18650 / 21700 / 20700, etc. |
| Recommended For | 17700 primary users | 17670 primary users | 18650 / 21700 primary users |
Popular 17700 Charger Models – Quick Reference
| Category | Model | Bays | Charge Current | Features |
|---|---|---|---|---|
| 4-Bay Multi-Function | XTAR VC4 | 4 | 0.1A–1A (adjustable) | LCD display, supports Li-ion/NiMH, compatible with 17700 and 30+ sizes |
| 4-Bay Fast Charger | XTAR VC4S | 4 | 0.25A–3A (adjustable) | 3A fast charge for 18650, low current for 17700, Type-C input |
| 2-Bay Smart Charger | Nitecore Ci2 | 2 | Up to 3A (single bay) | USB-C input, QC/PD fast charge, compatible with 17700 and 30+ sizes |
| 4-Bay Smart Charger | Nitecore D4 | 4 | 0.3A–0.75A | Independent channels, auto-detection, LCD |
| 4-Bay Analyzer Charger | XTAR VX4 V2 | 4 | Manual selectable | Supports Li-ion/NiMH/LiFePO₄/1.5V Li-ion, capacity testing function |
| 2-Bay Digital Charger | Nitecore UM2 | 2 | Up to 1.5A | LCD display, USB input, compatible with 17700 and multiple sizes |
| 6-Bay Smart Charger | Nitecore Q6 | 6 | Auto-adaptive | 6 independent channels, auto-activates over-discharged cells, supports 17700 |
| Single-Bay Portable | XTAR MC1 | 1 | 0.25A/0.5A | USB input, ultra-compact, auto-detection |
| 2-Bay Portable | XTAR MC2 | 2 | 0.5A×2 | USB input, ultra-portable, compatible with 17700/18650, etc. |
Typical Specifications Range (17700 Chargers)
| Parameter | Typical Range |
|---|---|
| Input Power | USB 5V / Type-C / QC/PD |
| Charge Cutoff Voltage | 4.2V ±0.05V (Li-ion) / 3.65V (LiFePO₄) / 1.45V–1.5V (NiMH) |
| Charge Current Range | 0.1A – 3A (adjustable/adaptive) |
| Supported Cell Sizes | 17700 / 17670 / 17650 / 16650 / 18650 / 21700 / 14500, etc. |
| Protection Features | Overcharge, over-discharge, overcurrent, short-circuit, reverse polarity, overheat |
| Display Type | LED indicators / LCD digital display |
| Operating Temperature | 0°C – 40°C |
Typical Applications
| Application Scenario | Recommended Charger | Why |
|---|---|---|
| Multi-device user; charge 17700, 18650, NiMH together | 4-bay multi-function (XTAR VC4 / XTAR VX4 V2) | Compatible with Li-ion/NiMH/LiFePO₄, one charger does it all |
| Tactical flashlight user, using 17700 to replace 2xCR123A | 4-bay smart charger (Nitecore D4 / XTAR VC4) | Secure grip for 17mm diameter, precise termination, extends cell life |
| Daily home use, charging 1–2 17700 cells | 2-bay digital charger (Nitecore UM2 / Nitecore Ci2) | Real-time data display, clear charging status, secure fit |
| Need to charge multiple cells (3–6) simultaneously | 6-bay smart charger (Nitecore Q6) | 6 independent channels, auto-activates over-discharged cells, highly efficient |
| Travel / on-the-go charging for 17700 flashlight/medical device cells | 1/2-bay USB portable (XTAR MC1/MC2) | Ultra-compact, plug into any USB port, supports power bank charging |
| Need to test capacity and internal resistance for cell matching | 4-bay analyzer charger (XTAR VX4 V2) | Capacity testing function with high precision, supports multiple chemistries |
How to Choose the Right 17700 Charger?
| Your Requirement | Recommended Type | Suggested Model |
|---|---|---|
| I have multiple cell types (17700/18650/NiMH) and need one universal charger | 4-bay multi-function charger | XTAR VC4, XTAR VX4 V2 |
| I want real-time charging data monitoring, daily home use | 2-bay digital charger | Nitecore UM2, Nitecore Ci2 |
| I need to charge multiple cells (3+) simultaneously | 6-bay smart charger | Nitecore Q6 |
| I only charge 17700 cells and need maximum portability | 1/2-bay USB portable | XTAR MC1/MC2 |
| I need fast charging for 18650 but also 17700 compatible | 4-bay fast charger | XTAR VC4S |
| I need to test capacity and internal resistance for cell matching | 4-bay analyzer charger | XTAR VX4 V2 |
| I use protected longer 17700 cells (~71mm+) | Extended slider models | XTAR VC4, Nitecore D4 |
| I need bulk quantities or custom charging solutions | Contact our sales team | — |
⚠️ 17700 Charger Safety Guidelines
- Distinguish Battery Chemistry: 3.7V Li-ion (full charge 4.2V), 3.2V LiFePO₄ (full charge 3.65V), and 1.2V NiMH (full charge 1.45V) require different modes—do not mix. Ensure the charger has correctly identified or manually set the appropriate mode before charging.
- Confirm Compatibility with 17mm Slim Cells: Some 18650 chargers have weak negative springs that cannot securely hold 17mm diameter 17700 cells, leading to poor contact. Verify product supports 17700 or 17670 sizes before purchase.
- Check Slider Travel for Protected Cells: Protected 17700 cells can reach up to 71mm or more in length. Ensure the charger's maximum supported length is ≥72mm before purchase.
- Select Appropriate Charge Current: 17700 cells charge best at 0.3A–0.5A (Li-ion) or 0.1C–0.2C (NiMH). If manual setting is available, select a low current; if adaptive, ensure proper detection.
- Avoid High-Temperature Charging: Keep away from heat sources and direct sunlight; ensure good ventilation during charging.
- Remove After Full Charge: Although chargers feature auto-termination, prolonged connection to power may still affect battery longevity. Remove batteries promptly after charging.
Why Choose Our 17700 Chargers?
- Genuine Brand Products: Chargers from XTAR, Nitecore, and other global professional charger brands—reliable quality with full safety certifications.
- Precisely Compatible with 17700: Curated selection of models supporting 17mm diameter and 70mm length with secure grip—eliminates compatibility issues.
- Multi-Chemistry Compatibility: Select models support both Li-ion and NiMH batteries—one charger for multiple needs.
- One-Stop Shopping: 17700 batteries, chargers, and accessories all in one place—save time and effort.
- Flexible Purchasing: Single-unit retail and bulk wholesale options available for both individual and enterprise needs.
- Certified & Safe: CE, FCC, RoHS certifications ensure quality and safety.
- Expert Technical Support: Guidance on charger selection, usage tips, and after-sales support.
👇👇👇 Browse the product list below to find the perfect 17700 Charger for your needs. For volume quotes or technical inquiries, please contact our customer service team.
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