Overview and Core Features
The Technoline BL-700N battery charger is designed as a flexible and reliable solution for maintaining AA and AAA rechargeable batteries. It features four fully independent charging channels, allowing each cell to be charged, discharged, refreshed, or tested without affecting the others. The unit supports both NiMH and NiCd chemistries, making it suitable for mixed battery types and for users who rotate cells individually rather than in matched sets.
Each slot includes its own LCD display, providing real‑time information for the selected battery. The display can show charge or discharge current, terminal voltage, accumulated mAh, and elapsed time, giving clear insight into the condition and behaviour of each cell. This level of monitoring helps ensure that every battery receives appropriate treatment based on its actual state rather than assumptions.
The BL700N offers four operating modes—Charge, Charge/Test, Discharge, and Discharge/Refresh—covering routine charging as well as deeper maintenance cycles. These functions make the charger suitable for everyday household use, as well as for users who want to track performance or extend the lifespan of their rechargeable batteries.
Independent Control, Performance Matching, and Safety Systems
Each charging bay can be configured independently, allowing different functions to run simultaneously across the four slots. Charge current can be set individually for each battery, with selectable levels of 200 mA, 500 mA, or 700 mA to accommodate slower, more conservative charging or faster turnaround when needed. The charger is compatible with any AA or AAA rechargeable cell up to 3000 mAh, regardless of size or chemistry.
The BL700N is also well‑suited for grouping batteries into matched sets, as its individual monitoring makes it straightforward to identify cells with reduced capacity or inconsistent performance. This helps ensure that sets used together—such as in cameras, torches, or controllers—deliver more predictable and balanced output.
A range of control and protection features are built into the charger, including −ΔV (negative delta‑V) charge termination, thermal monitoring, bad‑cell detection, short‑circuit protection, and overload sensing. These systems work together to maintain safe operation while ensuring that each battery is charged according to its condition and behaviour.
The Technoline BL-700N battery charger is available in the UK from a number of suppliers including