User manual

DPSI RV Family Operating Instructions Version 2.1
page 25 of 44
6.5. Selecting the Batteries
All commercially available batteries are considerable (NiCd and NiMH),
as well as Lithium-Ion (LiIon) and Lithium-Polymer (LiPo) or Lithium-
Ferrum-Phosphat (LiFePO4) batteries. These batteries are unlimited
applicable independent of the selected output voltage.
Even 6-cell (and 7-cell) NiMH batteries can be connected. This only
makes sense if the output voltage of the DPSI is set to high values
(7.4V) and the connected servos may be supplied with these higher
voltages. Usually, 5-cell NiCd/NiMH or 2-cell LiPo batteries are utilized.
Using 4-cell battery packs (NiCd / NiMH) are not allowed for a DPSI!
Battery capacities
Generally, ampacity and capacity of the batteries have to be
considered. Thus, 2 battery packs with 450 mAh are much too small for
a model with 10 servos. Here, two “2000’s” should be used, which can
be discharged with 5C. (C is the nominal capacity in Ah => a battery of
2.0 Ah can be discharged at 5C with 5 * 2.0A = 10A). Especially when
using digital servos anticipate higher current consumption.
In addition, when selecting the batteries, you should ensure that the
connection cables for the batteries are sufficiently thick. If a battery
with a cable diameter of 0.25mm
2
(AWG 24) is used, the advantage of
the DPSI is partially negated, since losses will occur in the thin cable.
Therefore, battery leads in larger models should be of the 1.0 –
1.5mm
2
(AWG 15 - AWG18) type.
The battery connection cables must be soldered to the delivered high
current connectors (if no readily provided batteries are used), then they
are compatible to a DPSI. A shrink hose for isolating soldering is
provided, too.