SKU: 62823494110

SparkFun Tenergy T4s Intelligent Universal Charger - 4-Bay

Sale price$3505.50 Regular price$3895.00
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Ships within 48 hours · Estimated delivery Aug 22 - Aug 27

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Description

SparkFun Tenergy T4s Intelligent Universal Charger - 4-BayThe 4 Bay T4s Intelligent Universal Charger from Tenergy is an automatic smart charger compatible with almost all types of rechargeable batteries, thereby eliminating the need to own multiple chargers. Capable of automatically identifying and charging Lithium Ion (Li ion), LiFePO4, NiMH and NiCD rechargeable batteries, the T4s applies the appropriate charging mode, whether it be a constant charge current (CC), constant charge voltage (CV) or trickle

The 4-Bay T4s Intelligent Universal Charger from Tenergy is an automatic smart charger compatible with almost all types of rechargeable batteries, thereby eliminating the need to own multiple chargers. Capable of automatically identifying and charging Lithium Ion (Li-ion), LiFePO4, NiMH and NiCD rechargeable batteries, the T4s applies the appropriate charging mode, whether it be a constant charge current (CC), constant charge voltage (CV) or trickle charge. The T4s is able to independently charge your desired battery, thanks to its four microcomputer-controlled charging slots, allowing you to get power back into your project or device quickly and easily!

The T4s Intelligent Universal Charger possesses an output voltage of 4.2V, 3.6V or 1.48V, depending on your charging mode, with an output current of either 425mA charging four batteries at once or 850mA charging two. There shouldn’t be much of an issue charging your desired battery since the T4s can charge AA, AAA, C and Sub-C size NiMH/NiCD batteries, as well as 26650, 22650, 18650, 17670, 18490, 17500, 17335, 16340 (RCR123), 14500 and 10440 Li-ion/LiFePO4 batteries. Additionally, this charger also features an easy-to-decipher LED charging status indicator to help you know exactly when your batteries are fully charged!

Note: When charging LiFePO4 batteries, select LiFePO4 battery type on the switch at the top of the unit.

Includes:

  • 1x T4s Intelligent Universal Charger
  • 1x US 12V Power Cord
  • 1x Car 12V Power Cord
  • 1x Instruction Manual

Features:

  • Maximum Discharge Current: 425mA x4 & 850mA x2
  • Standard Discharge: DC 4.2V, 3.6V, 1.48V
  • Compatible Chemistry: Li-ion/LiFePO4/NiMH/NiCD
  • Input Voltage: AC 100–240V 50/60Hz or DC 12V
  • Capable of charging 4 batteries simultaneously
  • Each of the four battery slots monitors and charges independently
  • Automatically identifies Li-ion, NiMH and NiCD rechargeable batteries
  • Three Charging Modes: CC, CV and Trickle Charge
  • Automatically detects battery status and selects the appropriate voltage and charge mode
  • 3 LED lights display charging progress for each battery
  • Automatically stops charging when complete
  • Reverse polarity protection
  • Designed for optimal heat dissipation

All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 62823494110

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4.1 ★★★★★
Based on 13 reviews
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Verified Purchase
Ruprecht
Carnegie, US
★★★★★ 5
I like the nylon strap.
Color: Black/White/Black
Watch itself is fine - doesn't stand out as something spectacular but is great for what it is. Definitely waterproof to about 30 feet deep - I've tested it snorkeling. The best thing is the strap - this nylon strap is much more comfortable than usual watch straps. There are a lot of nylon straps out there -- I think I prefer this one more than most of the others. the Velcro allows infinite adjustment, unlike straps with holes like a belt. And the way they did the looping of the band around itself seems to work really well. Better than another velcro strap I had many years ago ("the band") which was similar but didn't loop around itself the same way. This one is better - quicker and easier to put on and more easily adjustable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 1, 2025
S
Verified Purchase
Stephen Roth
Phoenix, US
★★★★★ 5
Great purchase
Color: Black/White/Black, Color: Black/White/Black
The perfect watch for my eyes. White background with black hour and the second hand. Standard stuff… It’s all about the simple things that matter to me. The indigo green light might not appeal to everyone (look at the price). The band is fabric with Velcro to adjust. I’ve work this watch day and night. A near perfect fit. Easy to adjust and it’s comfortable for me, the look is just right for me. A no brainer to set up immediately. Time (?) will tell about minute creep or over all durability, A nice affordable watch that I I’ll wear everyday under all conditions. If I loose it I’ll buy another one.
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Reviewed in the United States on February 10, 2026
F
Verified Purchase
FelixtheReader
Birmingham, US
★★★★★ 5
Inexpensive Box Checker That Works Great!
Color: Black/White/Black
Although I have a few watches I was looking for something that was more camping specific. Something that was EASILY legible to my 56 year old vision - both in daytime and night. I needed it to have some waterproofness ability as I would also using it for kayaking. I had a Timex Expedition watch with a black dial that I gave to my son as I wanted one with a white face which I find easier to read. I gave this watch some serious consideration after seeing so many YTbers give Timex field watches the thumbs up. I came upon this model and then when I saw one available under $30 it became a no-brainer! I used it recently for its intended purpose - a 3 day camping weekend. So here are my observations. The strap is probably the only negative to the watch for me as I have big hands and need to undo it completely to feed the strap through the buckle. A minor hindrance. Once its on it's light and comfortable. I may eventually change out the strap...or I may not. The watch is easily legible and nothing, I MEAN NOTHING, beats Timex's "Indiglo" feature for nighttime. Forget "watch lume" as nothing is a visibly legible at nights as "Indiglo". I have a Casio watch that has a light feature but that cannot hold a candle to this watch's nighttime ability. On a kayak trip, I overturned the kayak and the watch was in the water so it held up nicely for that. The watch is rated for 100M so that was nothing for it I know. It's hard to find a watch that does so much at this price point. I would definitely recommend it for someone looking for the features that it has in an inexpensive package.
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Reviewed in the United States on November 24, 2020
A
Verified Purchase
Andrey C
Lake Worth, US
★★★★★ 3
Decent watch, bad warranty.
Color: Black/White/Black
Decent watch, good design, solid strap. Bad warranty. I spent a little bit more money to get a better quality product with a name brand warranty, and I feel like it was a waste of money. The backlight stopped working within 6 months. I replaced the battery, but it didn't help. I started the process of a warranty repair with Timex, but then found out they have a $8 fee for in-warranty repair. With the cost of the watch being what it is, I'll just deal with the broken backlight. Next time I'll spend less money on cheap disposable non-brand name watches
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Reviewed in the United States on November 20, 2025
H
Verified Purchase
Harold the Barrel
Waukegan, US
★★★★★ 5
EXCELLENT WATCH FOR THE MONEY
Color: Black
The watch is reliable, well-made and looks high-end on the wrist. Excellent watch for the money!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2026

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