If you wish to look at an accessory piece of my equipment, you just click on it.
At this webpage you will find power supplies, batteries and chargers.
NiMH accumulators, Varta
During the preparations for a portable operation I make up my mind not to use my sealed lead-acid accumulators. For a long time I ogle with NiMH accumulators. They are ligther and smaller than comparable sealed lead-acid accumulators. But the offer is enormous. The accumulators are available both as single cells and as acumulator packs.
Finally I opt for single Mignon cells (AA) by Varta, which are usuable for high-current applications (not the normal ones). They possess a capacity of 2700 mAh with 1,2 V for each cell. For a transceiver operated with 12 V are ten cells to be used. You can unload the cells with up to 4800 mA (4.8 A) and down to 0.8 V. Thus a transceiver can be operated down to 8 V.
The used cells (four-pack, order no. 250484) and suitable holder (order no. 615617) are avaiable by Conrad Electronic. For charging I use a ready-made charger for NiMH accumulators (Mignon, AA). A tip: Buy as much cells as you need for two accumulator packs. While a package of ten cells is loading, you can use the second package.
Charger for NiMH accumulators, Basetech
There I stood now with my 10 NiMH accumulators. I own a suitable charger, but it can charge only 2 cells at the same time. Devices, which charge 4 cells one finds many, such for 8 cells already less. I found only one charger, which can charge at least 10 cells at the same time. It is the BTL12 labeled Basetech, which is for example available by Conrad Electronic (order no. 200112). The newer version BTL14 with display is also avaiable by Conrad Electronic (order no. 1541355). I selected consciously a device, that don't uses high-speed charging. It charges the cells with 250 mA (trickle charging current 25 mA). The charge process takes longer (approximately 15 hours in relation to 3 until 4 hours), but the cells are take care in such a way. To emphasize is, that the BTL12 supervises each cell separately and the device uses the so called -ΔV disconnection. The charger can be runs as well with the power adaptor from 100 to 240 V as with an adaptor cable from the 12 V car. Dimensions: 22,3 × 3,4 × 9,8 cm, Weight: 217 g
Sealed lead-acid accumulators
At the latest if one wants to become active away from the commercial power supply, the search for an alternative power supply begins. Although there are various accumulator types and high performance one-way solutions, I use mainly Sealed lead-acid accumulators. If one calculate the necessary capacity, astonishing small types can be used. They are usable over years if still suitable charge methods and fundamental usage hints are used.
Charger for sealed lead-acid accumulators
I was in search of a small and lightweight accumulator charger for a sealed lead-acid accumulator. It's should work at 110 and 230 V and have a current limiting. Unfortunately I do not found an usable one so I modified the output voltage of an available power by Egston. A description of the modification is available. The supply is avaiable also by Conrad Electronic.