Basen Bs4 Charger

The Basen BS4 (marketed as BO-4/BO-4 Pro) is a versatile quad-slot intelligent charger that bridges the gap between traditional 18650 support and the emerging 21700 standard. Market trends for 2026 highlight a significant shift toward higher-capacity cells and integrated USB-C charging, making the BS4's universal compatibility a strong commercial asset.

Product Overview: Basen BS4 (BO-4)

The BS4 is an entry-level "smart" charger praised for its speed and simplicity, though technical reviews suggest a need for caution regarding voltage consistency in specific slots. Lygte-InfoIelectrony

* Key Specs: 4 independent slots with variable charging currents (up to 2.0A on a single slot). It supports a massive range of 3.7V Li-ion and 1.2V Ni-MH batteries. Lygte-InfoIelectrony

* Performance: Uses a standardized CC/CV curve, ensuring safe termination for lithium cells. Lygte-Info

* Review Insights: Rated as "Acceptable" by technical experts. While it starts charging in under a second, some units have shown slightly high voltage (over 4.2V) in the second slot, which can decrease battery lifespan over time. Lygte-Info

2026 Market Trends & Insights

The cylindrical battery market is evolving rapidly, driven by demand in EVs, robotics, and high-drain consumer electronics. KeeppowerLinkedin

1. 1Transition to 21700: The 21700 format is officially surpassing the 18650 as the industry standard due to its 40-50% higher capacity (up to 6000mAh) and superior thermal management. Keeppower
2. 2The Rise of "Port-on-Battery": Standalone chargers like the BS4 are facing competition from batteries that feature direct USB-C charging ports on the cell itself, eliminating the need for a separate docking station for travel. Keeppower
3. 3Smart Charging Adoption: The global market for smart chargers is projected to grow at a CAGR of ~12% through 2035, with a heavy focus on safety features like integrated BMS and fire-retardant materials. FortunebusinessinsightsBusinessresearchinsights

Sourcing & Pricing Analysis

While the original Basen BS4 is available, the market is saturated with similar high-performance alternatives at competitive B2B prices. AlibabaAlibaba

* Entry-Level Quad Chargers: Alternatives like the PUJIMAX or Bmax models offer similar 4-slot USB-C charging for $2.10–$3.16 per unit. AlibabaAlibaba

* Premium LCD Options: Models with full LCD capacity testing (like the Lii-M4) range from $8.00–$11.00, providing higher transparency for professional users. Alibaba

Detailed specifications and a full list of competing products can be found in the attached sourcing files below.