Technical data

LZT 123 1834 45

• size is generally a factor of capacity, since larger capacity batteries naturally

have more material/cells, and will range between 2750mm

to 18000mm

for

small form-factor Li-Ion batteries

• the speed by which lithium-ion ages is governed by temperature and state-

of-charge; high temperatures and deep discharge will effect useful life

• if possible avoid frequent full discharges because this puts additional strain

on the battery, partial discharges with frequent recharges are better

• never short circuit the terminals of a Li-Ion battery

• do not expose Li-Ion batteries to moisture or rain

• monitor battery temperature during charging using a thermistor placed on or

near the battery wired to an ADC input on the module

• Li-Ion batteries have a higher ESR (compared to Ni-Cd or Ni-MH), although

this should not be a limiting factor for peak current delivery, any battery

should be capable of at least 50% greater than the GR64 demands (~3A pk)

To determine battery life, on a full charge, the following rule of thumb can be

applied:

Standby time = Battery Capacity (mAh) / Idle current (mA)

Call time (voice or data) = Battery Capacity (mAh) / Call current (mA)

Example 1 – Standby time:

A 600mAh rated Li-Ion battery, from fully charged (around 4.2V) to the module cut-

off point (3.2V) will provide around 95% of its total charge capacity. For a standby

(idle) current of 18mA, the module will typically provide

600*0.95/18 = 32 hours standby time

Example 2 – Call time:

An 1800mAh rated Li-Ion battery fully charged, transmitting maximum power on a

low-band (850/900MHz) channel may consume an average 320mA, therefore the

module would typically provide

1800*0.95/320 = 5 hours 20 mins call time