Electronics >>
HKM-632659 High-Capacity Portable Energy Storage Power Supply with Multiple Charging Options
Model HKM-632659
High-Capacity Portable Energy Storage Power Supply
A versatile 330WH powerhouse engineered to keep your essential devices charged — at home, in the wilderness, or on the open road.
Capacity
330 WH
90,000 mAh total energy reserve
Battery Tech
21700 Cells
20 premium lithium cells, ~50 phone charges
Energy That Lasts
330 watt-hours of stored energy means you can charge a typical laptop 4–6 times, power a mini-fridge for hours, or keep smartphones alive for days. The advanced 21700 cell architecture — the same form factor trusted by leading EV manufacturers — delivers higher energy density and superior thermal stability compared to older 18650 designs, giving you more power in a compact footprint.
All the Ports You Need
Simultaneous multi-device charging through a comprehensive array of interfaces.
AC Output
1 × AC Socket
Pure sine wave for laptops & small appliances
Type-C
2 × USB-C
Fast PD charging for modern devices
USB-A
4 × USB Ports
Charge phones, tablets & accessories
Vehicle Socket
1 × 12V DC Out
Power car accessories on the go
DC Input
2 × DC In
Flexible recharging & solar panel ready
Engineered with 21700 Lithium Cells
A closer look at the battery technology that powers your adventures.
Why 21700 Cells Matter
The HKM-632659 houses 20 precision-engineered 21700 lithium cells. Each cell measures 21 mm in diameter and 70 mm in length — a form factor that has become the gold standard in high-performance energy storage. Compared to traditional 18650 cells, 21700 cells offer approximately 35–45% more volumetric energy density, meaning more watt-hours per cubic centimeter. This translates directly into a lighter, more compact power supply that doesn't compromise on endurance. The cells are arranged in a balanced series-parallel configuration to optimize both voltage stability and discharge efficiency, ensuring consistent power delivery from 100% down to the last watt-hour.
Fast Recharge. Solar Ready.
Minimize downtime with rapid wall charging or harness the sun for infinite off-grid energy.
Rapid Recharge
High-efficiency charging circuitry refills the battery quickly via AC wall power, so you spend less time waiting and more time exploring.
Solar Compatible
Connect compatible solar panels via the DC input ports to trickle-charge under sunlight — ideal for extended camping trips and off-grid living.
Solar Charging in Practice
When connected to a 60W–100W solar panel (sold separately), the HKM-632659 can harvest renewable energy throughout daylight hours. For a typical sunny day, you can expect to recoup a significant portion of the battery's capacity — enough to keep critical devices running indefinitely. The built-in MPPT-compatible charge controller optimizes power extraction from the panels, adapting dynamically to changing sunlight conditions. This makes the HKM-632659 not just a backup power source, but a genuine off-grid energy hub.
Comprehensive Safety Architecture
Multi-layered electronic protections guard both the power supply and your connected devices.
Input Overcurrent
Automatically limits incoming current to safe thresholds
Overcharge Protection
Prevents cell voltage from exceeding safe limits
Short Circuit
Instant cutoff on detecting abnormal current paths
Reverse Polarity
Blocks damage from incorrect DC connections
Peace of Mind, Built In
Every charge cycle is monitored by an intelligent battery management system (BMS) that continuously samples voltage, current, and temperature across all 20 cells. If any parameter deviates from the safe operating envelope, the BMS intervenes in microseconds — isolating the affected circuit before damage can occur. This multi-tiered protection architecture is the same approach used in medical-grade and aerospace power systems, scaled for portable consumer use.
Built for the Outdoors
Durable, water-resistant construction with an ergonomic grip designed for real-world conditions.
High-Grade Waterproof Shell
The enclosure is crafted from a premium engineering-grade plastic with an IPX4-rated water-resistant design, meaning it shrugs off rain, splashes, and damp environments. The surface texture is optimized for grip — even with wet or gloved hands — so you can confidently handle the unit in challenging outdoor conditions. Reinforced corners absorb impact energy, and the internal structure features ribbed bracing that adds rigidity without excess weight.
Compact. Portable. Always Ready.
Dimensions that slip easily into a backpack, yet powerful enough to run essential gear.
Dimensions
11.0 × 7.7 × 3.7 in
280 × 195 × 95 mm
Form Factor
Backpack-Ready
Fits easily in most daypacks and gear bags
Wherever Life Takes You
One power supply, countless use cases — from daily convenience to emergency preparedness.
Home Backup
Keep routers, lights, and small appliances running during outages.
Camping
Power lights, fans, and CPAP machines under the stars.
Road Trips
Charge devices and run car accessories without draining your vehicle battery.
Remote Work
Power your laptop and monitor setup from anywhere with an AC outlet.
Emergency Kit
A dependable power reserve for first-aid devices and communication tools.
Technical Specifications
Key specifications at a glance.
- ModelHKM-632659
- Rated Capacity330 WH / 90,000 mAh
- Battery Type21700 Lithium-Ion ×20
- AC Outlet1 × Pure Sine Wave
- USB-C Ports2 × Type-C (PD)
- USB-A Ports4 × Standard USB
- DC Output1 × 12V Vehicle Socket
- DC Input2 × DC In (Solar Compatible)
- Enclosure MaterialHigh-Grade Plastic, IPX4
- Dimensions11.0 × 7.7 × 3.7 in
- Dimensions (metric)280 × 195 × 95 mm
- Safety FeaturesOvercurrent, Overcharge, Short Circuit, Reverse Polarity
Frequently Asked Questions
Answers to the most common questions about the HKM-632659.
How many times can this power supply charge my smartphone?
With a 90,000 mAh total capacity, the HKM-632659 can charge a typical smartphone (with a ~4,000 mAh battery) approximately 18–22 times from 0% to 100%. The exact number depends on the phone model, usage during charging, and cable efficiency. For older devices with smaller batteries, this figure can reach up to 50 full charges. The 330 WH energy rating provides a more universal measure: divide 330 by your device's battery watt-hours to estimate charge cycles.
Can I use this while it is being charged?
Yes — the HKM-632659 supports pass-through charging, meaning you can charge the internal battery while simultaneously powering connected devices. This is especially useful during solar charging sessions or when you have limited access to wall outlets. The intelligent power management system prioritizes device output while safely routing excess current to the internal battery.
What kind of solar panels are compatible?
The DC input ports accept standard MC4 or barrel-jack connections from most portable solar panels rated between 18V and 24V, with a recommended power range of 60W to 100W. Panels from reputable brands with built-in charge controllers work seamlessly. For optimal charging speed, look for panels with an open-circuit voltage around 21–24V. Always verify connector compatibility before purchase — adapters are widely available if needed.
Is the AC outlet a pure sine wave or modified sine wave?
The HKM-632659 features a pure sine wave inverter for the AC outlet. This is critical for sensitive electronics such as laptops, medical devices (like CPAP machines), and audio equipment. Pure sine wave output ensures clean, stable power that mimics utility-grid electricity, eliminating the risk of buzzing, overheating, or malfunction that can occur with modified sine wave inverters.
How long does it take to fully recharge from a wall outlet?
Recharge time varies based on the input power source. Using the included AC adapter connected to a standard wall outlet, you can expect a full recharge in approximately 6–8 hours. Faster charging is achievable with higher-wattage DC inputs. When using solar panels, recharge duration depends on sunlight conditions — a 100W panel in direct sun can replenish the battery in roughly 5–7 hours of peak sunlight.
What is the lifespan of the battery cells?
The 21700 lithium cells used in the HKM-632659 are rated for over 500 full charge-discharge cycles while retaining at least 80% of their original capacity. Under typical usage patterns — partial discharges followed by recharges — the effective lifespan extends significantly. With average use of 2–3 cycles per week, you can expect several years of reliable service before noticing any meaningful capacity degradation.
Purchase with Confidence
Every HKM-632659 comes backed by our comprehensive customer commitment.
Free Shipping
Complimentary standard shipping on every order — no minimum purchase required.
180-Day Protection
Extended purchase protection covers defects and performance issues for a full six months.
30-Day Money-Back
Not satisfied? Return within 30 days for a full refund — no questions asked.
24-Month Warranty
Full two-year warranty service covering manufacturing defects and component failures.
Every product we offer includes a 180-day purchase protection plan at no additional cost. This coverage extends beyond a standard warranty, reflecting our confidence in product quality and our ongoing commitment to your satisfaction.
The protection plan is designed to provide practical help in real-world situations. Whether you encounter a manufacturing issue, a performance problem, or an unexpected accident, our team is ready to assist with clear, fair solutions.
What Is Covered
Manufacturing Defects
We replace items with material or workmanship flaws at no charge.
Performance Failures
Free repair or replacement if the product fails under normal use.
Accidental Damage
One-time courtesy replacement at a reduced price.
Zero Hidden Fees
All shipping costs for replacements and returns are covered.
How to File a Claim
How This Differs from the Warranty
The 180-day purchase protection includes accidental damage and performance failures that are typically not covered by a standard warranty. It provides an additional layer of support during the first six months after purchase, giving you greater confidence and peace of mind.
We want you to be completely satisfied with your purchase. If for any reason you are not fully happy, you may return your item within 30 days of delivery for a full refund. No lengthy forms, no unnecessary questions.
Our return policy is built on a simple principle: if the product is not right for you, we will make it right. We understand that online shopping involves trust, and we work hard to earn that trust with every order.
Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
Proof of Purchase
A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
How to Start a Return
Returns & Exchanges Overview
Damages & Exchanges
Please inspect your order as soon as it arrives. If the item is defective, damaged, or incorrect, contact us immediately so we can evaluate the issue and make it right. For exchanges, the fastest option is to return the original item and place a new order for the replacement.
We believe in the quality of our products, and we want you to share that confidence. Every product is backed by a 24-month warranty covering all structural and functional components, including zippers, buckles, straps, and fabric integrity.
The warranty is designed to be simple and accessible. You only need your proof of purchase to begin a claim, and our team will assess the issue promptly. If a manufacturing issue arises, we will make it right.
What the Warranty Covers
Comprehensive Coverage
Every part warranted for two full years.
Free Repair or Replacement
Whichever is faster, at no cost to you.
Quick Turnaround
Claims assessed within 1 business day.
Transferable
Warranty follows the product, not the owner.
How to File a Warranty Claim
Every order ships free—no minimums, no hidden fees. We currently deliver across the United States and are actively working to expand to more countries. We partner with reliable U.S. courier services to ensure your order arrives safely and on time.
Our delivery process is designed for transparency. From the moment you place your order to the moment it reaches your door, you receive clear updates at every stage. We carefully inspect each product before dispatch, and we provide tracking information as soon as your order ships.
Our U.S. Shipping Partners
USPS
Official national carrier with nationwide coverage.
UPS
Fast and reliable ground and express shipping.
FedEx
Express delivery with real-time tracking.
DHL eCommerce
Efficient parcel delivery for e-commerce shipments.
Delivery Process
Delivery Time Summary
Cancellations & Taxes
You may cancel your order at any time before it ships. All product prices include applicable taxes, and there are no additional VAT or customs fees for orders delivered within the United States.
Whether you have a question, need help with an order, or just want some advice, our support team is available around the clock. We don't just respond to messages—we work with you to find real solutions that fit your needs.
Our support specialists are trained to handle a wide range of requests, from product recommendations to technical troubleshooting. No matter the question, you can expect a professional and friendly response.
How We Can Help
Product Guidance
Our experts help you choose the right product.
Order Assistance
Modify orders, track shipments, or speed up delivery.
Warranty & Returns
Start claims or returns quickly and easily.
Technical Troubleshooting
Step-by-step solutions for product issues.
Contact Information
24/7 Phone
+1 (209) 280-3200
support@hekomart.com
Address
3401 Dale Rd, Modesto, CA 95356
Support Hours
Available 24 hours a day, 7 days a week
