Conrad Course material 10127 14 years and over 10127 Manual De Usuario

Test setup: Plug board, cable with USB-A plug, resistor 100 Ω, LED orange, 

battery holder, rechargeable battery AA or AAA, if present: Multimeter
The rechargeable batteries, such as the NiMH rechargeable batteries and the 

NiCd rechargeable batteries, are alternatives to disposable batteries. The last 

rechargeable battery type listed is no longer sold.
Nickel metal hydride rechargeable batteries are currently the most common 

rechargeable battery type. They are available in various formats. In turn, the most 

frequently used formats would be mignon (AA) and micro (AAA). Both can be 

inserted and used in the battery holder of this learning package. 
The battery types are mostly unproblematic when charging and in application. 

Sometimes, the low cell voltage of 1.2 V as compared to the system voltage of 

disposable batteries at 1.5 V, is a problem in practice.
Although the rechargeable battery type nickel cadmium is no longer sold, many of 

these rechargeable batteries are still in use. Cadmium is toxic, which is why sale 

of this rechargeable battery type is forbidden and has ceased. At the same time, 

NiCd rechargeable batteries are very robust and will work without problems for a 

long time if they are properly charged and used.
Below, a simple continuous charging circuit (charge maintenance) from the USB 

source for NiMH and NiCd rechargeable battery cells is explained. The LED 

indicates the charging function while also regulating the charge current to approx. 

20 mA (with the rechargeable battery flat). The »fuller« the rechargeable battery is 

charged, the lower will the charging current be and the less will the LED light up.