GMR STAMA Evo, Operating Instructions Manual

Page: 18 / 26

GMR maskiner a/s
STAMA Micro, Parker, Mini, Multi, Evo, Maxi EL
Lithium batteries
Page 18
Operating Instructions
GB
The lithium battery pack contains a number of individual LFP cells. The
pack has a nominal voltage of about 3.3 V per cell. This is the safest
type of lithium battery on the market.
LFP batteries have a flat discharge curve, i.e. the voltage remains at
about 3.2 V until the battery is about 80% discharged, after which the
voltage diminishes sharply. To minimise the risk of damage and prolong
the lifetime of the batteries, we recommend that they are never more
than 80% discharged.
LFP battery discharge curve at different temperatures
Voltage (V)
Discharged capacity (%)
LFP batteries have a longer lifetime than conventional lead-acid
batteries. They can withstand more than 3,000 70% depth of discharge
(DOD) cycles. The voltage of LFP batteries must not fall under 2.5 V
per cell. If voltage falls below this level, the cells may be irreparably
damaged.
Battery lifetime
The battery pack
(LFP = Lithium Ferro
phosphate)