The charger works as described. I hasn't updated mine in around 15 years so it's nice to catch up to modern times.
Discover the next level of battery charging with the Advanced Hohm School Dual BLD Battery Charger, engineered to simplify your charging needs without the clutter of screens. This innovative charger is built on the reliable Hohm SCHOOL platform, now enhanced with dual Battery Length Detection (BLD) Systems and an upgraded Input Power Regulator (IPR) to seamlessly manage power delivery. The BLD system intelligently adjusts the charging amperage based on the battery's length, ensuring each cell receives exactly what it needs for optimal charging. With the ability to revive batteries considered beyond recovery and equipped with a robust USB-C connection that supports up to a 4A combined charge rate, this charger is designed to make battery charging as effortless as possible.
Technical Info:
- Advanced BLD System: Automatically adjusts amperage based on battery length, ensuring optimal charge rates and prolonging battery life.
- Integrated IPR: Regulates input power directly within the unit, protecting USB power sources and ports from stress and damage.
- 2V Activation at 0.2A: Capable of charging deeply discharged batteries, restoring cells you thought were permanently depleted.
- Intuitive LED Indicators: Features solid and pulsing LED lights for quick and easy charge status updates at a glance.
- Comprehensive Safety Features: Includes reverse polarity, wrong battery type, overcharge, and short circuit protection, ensuring safe operation.
Technical Info:
- Input – DC 5V/4A, 2A, 1A (USB type C)
- Output – Up to 4A Distribution: 2*2A, 4*1A
- SIZE/TYPE COMPATIBILITY - ✔ 18650 ✔ 20700 ✔ 21700
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Data Specification Sheet: Hohm Tech School 4 Manual
- Hohm Tech School 4 battery charger
- HC USB-C cable
- User Manual with Warranty info
⚠ Important Safety Warnings
Improper use of a battery charger can result in overcharging, short circuits, or damage to the battery, causing FIRE, EXPLOSION, or ELECTRICAL SHOCK. Users must follow all safety guidelines to ensure proper operation. Click here to review the full safety guidelines.
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Device Compatibility:
- Use the charger only for compatible battery types and sizes as specified by the charger manufacturer. Ensure the charger is appropriate for the battery chemistry, size, and protection status (e.g., unprotected or protected cells).
- Do not charge non-rechargeable batteries (e.g., alkaline or primary cells).
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Proper Use:
- Only charge batteries in a fireproof or non-flammable area. Avoid charging on beds, couches, or other flammable surfaces.
- Do not force a battery into the charger slot if it does not fit properly. This can damage the charger or battery and may result in unsafe charging conditions.
- Inspect batteries before charging: Do not charge if the battery casing, wrapper, or terminals are damaged, dented, leaking, or bulging.
- Never leave batteries unattended while charging. Monitor the charging process, and unplug the charger when charging is complete.
- Avoid exposing the charger to liquids, high heat, or direct sunlight.
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Inspection:
- Do not use the charger if the power cord, plug, or device is damaged.
- Inspect both the charger and the battery for any signs of damage before use.
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Storage & Handling:
- Keep the charger away from children and pets.
- When not in use, unplug the charger and store it in a cool, dry place.
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Prohibited Activities:
- Do not modify or disassemble the charger.
- Do not attempt to repair a damaged charger—replace it with a new one.
- Avoid using extension cords or adapters that exceed the manufacturer’s recommendations.
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Emergency Response:
- If the charger or battery emits smoke, sparks, or a burning smell, disconnect the power immediately and move the battery and charger to a safe area.
- In case of fire, use a Class D fire extinguisher or sand to extinguish the flames.
Disclaimer
IMR Batteries is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Battery chargers must only be used with compatible battery types and operated in accordance with manufacturer instructions. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to their customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.8 / 5 from 39 reviews.
Took a little getting used to; the spacing between the inner and outer battery slots is a bit awkward till you get used to it. But so far, it's working as expected. Even managed to charge a pair of batteries I thought were dead!
Yes, I got this four bay battery charger by the name of hohms battery charger I really like it a lot. The price was excellent at IMR batteries I would highly recommend to anybody to order from them. If you don’t believe me just shop around. They probably have the best prices per batteries, battery chargers check it out you won’t regret it.
Works
Caused the smoke detectors to go off in my apartment because the vaping is non stop. Never have to wait for my mod to charge cause the big Ds charge fast AF. 10/10 worth the bi.
Great product as always and excellent price!
Shipping was fast and the charger works great.
So far it is working well. Just wished it refreshed old run down batteries
We had to replace our former charger and this one was the closest to it. One of the things that our old charger started to do was scrape/scratch the wraps on the batteries, so far this charger seems to not do that
Works great! No problems with anything. Quick ship and great product! Thank you!
Charges fast
It is an excellent battery charger. The price is incredible for the quality performance. I highly recommend. It's better than the more expensive fancy battery chargers. Also, it has a C port that works with all my cables.
Good so far
I was very pleased with how fast I recieved my order as well as the quality. I was pleased to see that it had two turbo charges and then to two of your regular I guess you would call them but I'm very happy would highly recommend for anyone who has multiple battery sets
Best charger I've used so far. A bit beefier than my old one.
Charger works well.
Exlent,
Just tried and works fine. Time will tell
charges fast and allows me to charge two of the three sets I have while using the third set so I'm never waiting for batteries to charge.
Nice and compact a great charger for traveling. I also have the Hohm base charger but it is a little bulky for travel so we got this one and love it.
Work’s great very easy to use
Its a nice little charger to be sure. For me its the perfect on the go charger capable of charging 4 batteries at once.
Great lightweight travel charger.
this charger has brought new life to my old batteries.
Great Product so far. Thanks
Great little charger. Charges my batteries quick. Excellent quality.
Very pleased with my purchase. it seems like a very high quality unit. Charges quickly. Thanks
It seems to charge very slowly. Shower than the 2 battery charger i have from hohm tech. Even on the fast charge. On the 1a slot it takes 4 hours to charge a battery at about 1/4 remaining battery life. The other charger does it in 1 hour 30 minutes. The fast charge ports take 2 hours 10 minutes.
Doesn't work properly. Haven't heard back from CS.
Thank you for the heat product at an incredible price
Works as expected. Charges .5, 1, and 2s.
Works as expected
Love my new charger.
I love their batteries , hope this last longer than the Nitecore one I baught a month ago and stoped working after very lite use.
Solid unit charges my 21700 batteries for vaping. Low light which is great at night simple to use and worth the money
Its been working good
Charges fast and keep battery 🔋 full
Work’s great very easy to use
Work�s great very easy to use