The Tenergy T4S charger is engineered to accommodate LiFePO4, Li-ion, NiMH, and NiCd batteries through adjustable voltage and current settings. Its smart detection system identifies battery chemistry automatically, optimizing charge cycles to prevent overcharging. Independent charging channels allow simultaneous charging of different battery types, making it versatile for users with mixed battery inventories.
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What Safety Features Are Integrated into the Tenergy T4S?
Advanced safety mechanisms include overcharge protection, short-circuit prevention, and reverse polarity detection. The charger employs temperature sensors to halt charging if overheating occurs and features a flame-retardant casing. These protocols ensure compliance with international safety standards like UL and CE, minimizing risks during prolonged or high-capacity charging sessions.
The Tenergy T4S incorporates a multi-layered protection system that operates at both hardware and software levels. Its microcontroller continuously monitors input voltage fluctuations, automatically adjusting current flow to prevent power surges. For Li-ion batteries, the charger implements a redundant voltage cutoff at 4.25V ±0.05V, providing an extra safety margin beyond typical 4.2V limits. The reverse polarity detection uses mechanical and electronic safeguards – spring-loaded contacts physically prevent incorrect insertion, while a digital checker validates orientation before initiating charge cycles. These combined features make it suitable for charging high-value batteries in unattended environments.
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| Safety Feature | Protection Range | Response Time |
|---|---|---|
| Overcharge Protection | ±1% Voltage Accuracy | <0.5 Seconds |
| Temperature Control | 0–45°C Operating Range | Real-Time Monitoring |
| Short-Circuit Prevention | All Battery Types | Instant Shutdown |
Which Battery Sizes and Capacities Are Compatible?
The Tenergy T4S supports AA, AAA, AAAA, C, D, and 9V batteries across all chemistries. For LiFePO4 and Li-ion, it handles 3.2V–4.2V cells with capacities up to 10,000mAh. NiMH/NiCd compatibility ranges from 1.2V–9V. Adjustable sliding contacts and spacers accommodate irregularly sized cells, including protected 18650 batteries.
Unique to the T4S is its adaptive bay design, which uses spring-loaded terminals with 30mm of travel to securely grip batteries from 14.5mm to 72mm in length. This enables charging of specialty cells like 32650 (65mm length) and stacked configurations for devices requiring multiple cells in series. The charger’s microprocessor automatically detects cylindrical vs. rectangular battery shapes, optimizing contact pressure to maintain stable current delivery. For 9V batteries, a dedicated slot with dual-terminal contact ensures proper alignment and minimizes contact resistance.
| Battery Type | Voltage Range | Max Capacity |
|---|---|---|
| LiFePO4 | 3.2–3.65V | 10,000mAh |
| Li-ion | 3.7–4.2V | 8,000mAh |
| NiMH | 1.2–9V | 10,000mAh |
FAQ
- Q: Can it charge 21700 lithium batteries?
- A: Yes, the adjustable bays accommodate lengths up to 72mm, supporting 21700, 20700, and 18650 cells.
- Q: Does it include a DC car adapter?
- A: No, the T4S operates on 100-240V AC only. Third-party 12V inverters can enable vehicle use.
- Q: How long to charge four 3000mAh 18650s?
- A: Approximately 3.5 hours at 1A per bay. Partial charging (50%) takes 1hr 45min.