Product Specifications for Tenergy T-9688 Universal 4-Bay NiMH/NiCd Smart Charger with USB Output
| BM Part #: | 01127 |
|---|---|
| Battery Size: | AA, AAA, C, D, 9 Volt |
| Shipping Weight: | 1.50Lbs |
| Warranty: | 60 Day Return |
| Rechargeable: | Yes |
- Universal Compatibility: Charges NiMH and NiCd batteries in AA, AAA, C, D, and 9V sizes — mix and match sizes in the same charge cycle without any manual adjustments.
- Independent Charging Channels: Each of the four bays operates on its own, so every battery receives a tailored charge regardless of what's in the other slots.
- Automatic Current Selection: The charger detects battery size and sets the correct charge rate automatically — 1,300mA for AA/C/D, 500mA for AAA, and 30mA for 9V.
- Backlit LCD Display: A clear, easy-to-read screen shows real-time charge status and battery level icons for each slot, so you always know where things stand.
- Multi-Layer Safety Protection: Negative delta V cut-off, short circuit protection, bad cell detection, and a safety timer work together to keep your batteries safe and healthy.
- Built-In USB Output Port: A rear USB port (5V/500mA) lets you charge a phone or small device at the same time, making this charger a versatile addition to any nightstand or countertop.
Product Description
If your home runs on rechargeable batteries, the Tenergy T-9688 is the one charger that can handle it all. Whether you're refreshing AAs for your TV remote, stocking up Ds for a flashlight, or topping off a 9V for a smoke detector, this smart charger takes care of up to four batteries at a time — all without you having to think about it.
One Charger for Every Size
The T-9688 supports NiMH and NiCd batteries in AA, AAA, C, D, and 9V sizes. The four main charging bays accept up to four AA, AAA, C, or D cells simultaneously, while two of those bays double as dedicated slots for 9V batteries. You can mix and match sizes in the same charge cycle — the charger handles each one independently, so you're never waiting on one battery to finish before another can start.
Smart Charging That Does the Work for You
There's no need to fiddle with settings. The T-9688 automatically selects the appropriate charging current based on the battery size it detects:
- AA, C, and D batteries charge at 1,300mA
- AAA batteries charge at 500mA
- 9V batteries charge at 30mA
Each channel is independently controlled, which means the charger optimizes the charge for each individual battery rather than treating them all as one group. When it's time to discharge before a refresh cycle, the T-9688 handles that too, at 400mA for AA/AAA/C/D cells.
Know Exactly What's Happening
A backlit LCD screen keeps you informed at a glance. Battery icons show the current charge level for each slot, and clear status indicators let you know whether a battery is charging, fully charged, or flagged as a bad cell. No guesswork, no mystery.
Built-In Safety Features
The T-9688 takes battery protection seriously. A negative delta V (–ΔV) cut-off function monitors the charge and stops it automatically when AA, AAA, C, and D batteries are full, helping to prevent overcharging. Additional safeguards include:
- Short circuit protection
- Non-rechargeable and bad cell detection
- Safety timer control as a backup overcharge failsafe
- Mechanical protection
These features work together to protect your batteries and extend their useful life.
A USB Port for Good Measure
On the back of the charger, you'll find a USB port that outputs 5V DC at 500mA. It's a handy addition for charging a phone, earbuds, or other small USB-powered devices while your batteries are refreshing. Note that the USB port activates when charging is complete or when the bays are empty.
Versatile Power Input
The T-9688 runs off the included AC adapter, which accepts 100–240V input — meaning it works with standard North American outlets as well as international power sources when paired with the right plug adapter. It's a reliable choice for home use and for travelers who bring their own rechargeable batteries on the road.
Backed by Tenergy's 1-year warranty, the T-9688 is a dependable all-in-one charging solution for any household that relies on rechargeable batteries.
Frequently Asked Questions
What battery sizes does the Tenergy T-9688 support?
The T-9688 charges NiMH and NiCd batteries in AA, AAA, C, D, and 9V sizes. Up to four AA, AAA, C, or D cells can be charged at once, while two of the bays also accept 9V batteries (up to two at a time).
Can I charge different battery sizes at the same time?
Yes. Because each bay operates independently, you can load different sizes in the same session. The charger will detect each battery and apply the correct charge rate for that specific size automatically.
Does the T-9688 work with both NiMH and NiCd batteries?
Yes, it is compatible with both NiMH and NiCd rechargeable battery chemistries. It is not designed for lithium-ion, alkaline, or any other battery type — charging incompatible batteries could cause damage or safety issues.
What does the negative delta V cut-off function do?
The negative delta V (–ΔV) cut-off monitors voltage during charging. When it detects the slight voltage drop that signals a full charge in AA, AAA, C, or D batteries, it automatically stops the charge. This helps prevent overcharging and extends battery life over time. Note that this feature does not apply to 9V batteries.
What is the USB port on the back of the charger for?
The rear USB port outputs 5V DC at 500mA, which is enough to charge small USB-powered devices like phones or wireless earbuds. It becomes active once charging is complete or when the battery bays are empty, so it works alongside your charging routine without requiring a second power outlet.
Does the charger come with a power adapter?
Yes, the T-9688 includes an AC adapter. The adapter accepts 100–240V input, making it compatible with standard U.S. outlets and usable internationally with an appropriate plug adapter.
Can the T-9688 discharge batteries as well?
Yes. The charger includes an automatic discharge function for AA, AAA, C, and D batteries at 400mA. Running a discharge before recharging can help recondition batteries and maintain their overall capacity over time.
