Bosch Kl 1206 Manual -

The Bosch KL 1206 is a rugged, simple, but obsolete charger. It works safely only with 12V NiCd Bosch battery packs under manual supervision. For modern batteries, recycle the KL 1206 or keep it as a collector’s item. For practical use, replace it with a modern universal smart charger (e.g., Bosch AL 1110 CV or a hobby-grade iMAX B6) with proper adapter leads.

Final verdict: If you own a vintage Bosch 12V NiCd tool set and the original battery packs, the KL 1206 is authentic and functional – but use a timer outlet (set to 60 minutes) to avoid overcharging. For anything else, retire it safely.

Bosch KL 1206 is a legacy automatic battery charger designed to maintain and restore 12V lead-acid batteries. Primarily intended for passenger cars and motorcycles, it is characterized by its simple, portable design and automated charging cycles. Device Overview and Specifications

The KL 1206 (often identified by part number 7 780 301 143 or 7 780 301 145) is a robust, portable unit. Its technical profile includes: AUTODOC UK Voltage Support : Optimized for 12V batteries. Charging Current : An effective charging current of (arithmetic current of 4A). Power Consumption : Draws approximately from a standard 230V input. Compatibility : Designed for various lead-acid battery types, including , and standard wet batteries with liquid electrolytes. Operating Instructions

The manual emphasizes a specific sequence for safe operation to prevent sparks or damage to vehicle electronics. Connection

: Always connect the charger to the battery before plugging it into the wall. Attach the red (+) clamp to the positive battery terminal. Attach the black (-) clamp Bosch Kl 1206 Manual

to the negative terminal or a clean grounding point on the vehicle chassis. Powering On

: Plug the device into a 230V mains outlet. The charging process typically starts automatically. Monitoring

: The built-in ammeter indicates the current intensity. As the battery reaches capacity, the ammeter needle will slowly move toward a lower constant value (though rarely reaching zero). Special Modes : Some versions include an impulse charging

feature. This activates automatically if a deep discharge is detected (between 7.5V and 10.5V) to help recover the battery before switching to a standard charging cycle. Disconnection : Once charged, unplug from the mains first , then remove the battery clamps to ensure safety. Safety and Maintenance

Автомобильное зарядное устройство Bosch KL 1206 - Юла The Bosch KL 1206 is a rugged, simple,

Bosch KL 1206 is a vintage battery charger typically used for lead-acid batteries. While official digital archives for this specific model are limited on the main Bosch site

, you can find related documentation through the following resources: Manual & Technical Details User Manual Access

: You can view or download the manual via community-shared documents on Google Docs or through professional tool archives on Functionality

: The device is designed to charge 12V batteries and often features a variable charging rate. It is commonly used for automotive and marine battery maintenance. Operating Instructions Ensure the battery terminals are clean before connecting. Connect the clamp to the positive (+) terminal and the clamp to the negative (-) terminal.

Plug the charger into a power outlet only after the clamps are securely attached. Bosch Official Support The Bosch KL 1206 is a legacy diagnostic

For newer models or to search for alternative manuals using a specific E-NR (model number), visit the official Bosch Instruction Manuals search page. Bosch Home troubleshooting steps for a specific issue you're having with the charger? Bosch Kl 1206 User Manual - Facebook


The Bosch KL 1206 is a legacy diagnostic and programming tool (or control module) used in automotive electronics and workshop diagnostics. This article examines what the KL 1206 manual typically covers, how to use the device safely and effectively, common problems and troubleshooting, technical specifications you’d expect in the manual, maintenance and calibration advice, and where to find legitimate documentation and support. Where appropriate I note likely variations between manual editions and model variants, and provide practical step-by-step procedures derived from typical Bosch diagnostic hardware manuals.

(If you mean a different Bosch product with the same model number, such as a power tool or industrial component, say so and I’ll adapt this article.)


The Bosch KL 1206 uses reversible carbide blades (82mm x 5.5mm x 1.2mm). The manual recommends:

How to change (summary from manual):


  • Bulb Type: Requires BA15d base (bayonet, double contact), 12V 21/5W.
  • This is a single-speed machine (On/Off only).