XTAR VC4SL Charger | 4-Bay USB-C Fast 3A, LCD, Capacity Test

Key Features

A lot of budget chargers physically can't accommodate a protected 21700 or 26650 cell, since the extra safety circuit built into a protected cell adds just enough length that the battery simply won't fit or seat properly in a slot sized only for bare, unprotected cells. The VC4SL is specifically sized to fit them, protected 21700 and 26650 included, alongside standard Li-ion cells from 10440 upward and NiMH AA/AAA, four bays running at once over USB-C with QC3.0 fast charging reaching up to 3A.

That protected-cell compatibility matters more than it might first seem: buyers who deliberately choose protected cells for the added safety margin, particularly for higher-drain devices, often discover only after buying a charger that it physically rejects the very cells they picked for safety reasons.

What the display shows

• Capacity, voltage, current and internal resistance, per bay
• Storage mode for safer long-term battery storage
• 0V activation for reviving over-discharged cells

Perhaps the most practically useful feature is the ability to revive a cell that's been over-discharged past the point most standard chargers simply refuse to engage with, treating what looks like a dead battery as recoverable rather than a write-off. This suits flashlight owners running protected cells specifically, vape users cycling through multiple batteries, and anyone with wireless microphone or DIY electronics projects who has previously been frustrated by a cheap charger that wouldn't physically fit their preferred protected cells.