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Tenergy T4s 4-Bay Charger


Brand: Tenergy

TN-T4s / 01432
Calculated at checkout

Product Description

Tenergy T4s is dual channel (the two bays per channel) multi-chemistry charger. Compatible with charging Ni-MH, Ni-Cd, Li-Ion and LiFePO4 batteries.

Charger Input:
100-240V AC @ 50-60Hz
12V DC

Battery Charging Output:
4.2V / 3.6V / 1.48V @ 425mA (4-bays) / 850mA (2-bays)

Length: 13.7 cm
Width: 9.7 cm
Height: 4.05 cm
Weight w/o Batteries: 206g

Operating Temperature: 0°C ~ 40°C
Operating Humidity: 10% ~ 90%
Storage Conditions: 20°C ~ 80°C
Storage Humidity: < 85%

Automatically detects Li-Ion, Ni-MH and Ni-Cd chemistries independently for each bay.
* LiFePO4 and Li-Ion are detected the same, only charge one of the two chemistries at a time and toggle the selector switch appropriately.
Charging mode and voltage are automatically adjusted for the detected chemistry and battery status.
- Charging modes are Constant Current (CC), Constant Voltage (CV) and Trickle Charge.
3 LEDs per bay for status indication.
Reverse polarity protection.
Designed for optimal heat dissipation.
Certified by CE.

Compatible Battery Sizes:
C Cell

* When charging 10440 or AAA, charge them in pairs. When charging only two 10440 or two AAA, place them in bays 1 and 3, or bays 2 and 4.


LED Indications:
Off - Charger not plugged in or no battery in the bay.
Constant - Battery in that bay has completed charge to that level. When all three for that bay are constant, the battery has completed charging.
Flashing - Battery in that bay is currently charging to the level that is flashing.
Flashing, Rapidly - Battery in that bay has an issue, unplug the charger and remove the battery.
Possible Issues:
- Short Circuit : Check the bay and battery for debris connecting the terminal points. Check the battery for damage.
- Reverse Polarity : Check that the terminal points of the battery are connected to the terminal points in the charger correctly. The narrow terminal goes inside the wider terminal of the other component.
- Faulty Battery : The battery may have been over-discharged or other wise internally damaged from use. The battery may have also reached end of life (usually over 300 cycles, potentially up to 1000 cycles).

Before using the charger, read the instructions manual.
This charger is intended for Ni-MH (Nickle-Metal Hydride), Ni-Cd (Nickle-Cadmium), Li-Ion (Lithium-Ion) and LiFePO4 (Lithium Iron Phosphate) chemistry batteries only.
Attempting to charge other chemistries may cause personal injury and damage to the charger.
For indoor use only - do not expose the charger to rain or moisture.
Remove batteries from charger when not in use (when not plugged into an outlet).
This charger is not intended for use by young children.


Unofficial Operational Notes:
The bays are described as independent yet there is still some interdependence.

- Battery chemistry is detected by each bay; with the exception that the whole charger must be switched between Li-Ion and LiFePO4, which means these two chemistries cannot be charged at the same time.
- Voltage is adjusted according to the chemistry in the bay.
- Charging mode is adjusted according to the chemistry in that bay.
- End of charge detection is adjusted according to the chemistry in that bay.

- Charge rate (mA) depends on how many bays are filled.
- Whole charger is switched between Li-Ion and LiFePO4. Only one of the two can be charged at a time, but Ni-MH and Ni-Cd can be charged with either.

What this means is that while charging batteries, where they are placed will impact how quick they will charge.
Charging small batteries (AAA and 10440) should be done as pairs placed in the paired bays - there should be a single bay between the two batteries being charged as a pair. (xoxo or oxox)
Charging any other size battery, they should be placed according to how many and their sizes (capacity).
- One battery: Charge in any bay.
- Two batteries: Charge in neighbouring bays (xxoo or oxxo or ooxx) or in the two outer bays (xoox).
- Three batteries: Charge the two smaller capacity (mAh) batteries as a pair (xoxo or oxox) and charge the largest capacity in one of the remaining bays (xyxo or xoxy or yxox or oxyx).
- Four batteries: Charge them in any order (wxyz).
- Four batteries, optimizing:
--- Option 1: Charge the two highest capacity batteries as a pair (oxox or xoxo) and the two lowest capacity as a pair (xyxy or yxyx). Remove the low capacity batteries when they complete charge and move over one of the large capacity batteries. (xxoo or oxxo or ooxx or xoox).
--- Option 2: Charge the highest capacity and the lowest capacity batteries as a pair (oxox or xoxo) and the two middle capacity batteries as a pair (xyxy or yxyx). As batteries complete charging, remove them (ooxy, oyxo, xooy, yxoo, etc).
--- Option 3: Charge only two batteries at a time. This will charge the first two batteries quicker, but will put a delay in charging the other batteries as the user will need to remove the charged batteries and insert the next set for charging. Unless quick charging the batteries is desired, it is better to fill all four bays as this will have a faster total charging time for the four batteries.

Bay Pairings:
1 and 3
2 and 4

Product Reviews

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  1. Tenergy T4S 4 bay charger Review Rating

    Posted by Rick on 7th Mar 2018

    It works great, shows how much they are charging, and when they are done. I only have one small problem with it. The springs that hold the terminal against the battery are very strong and the first time I took a battery out it snapped forward and damaged the wrapping on the battery. If you are careful it's ok so it's not a deal breaker.