ETS-Lindgren HI-3638 ELV/VLF Electric Field Meter - Manual (Page 21)

www.ets-lindgren.com Battery Charger 21
Battery Tips
If the battery exhibits low terminal voltage during charging or if it appears unable
to acquire or maintain an appreciable charge, individual cells in the battery may
be shorted or damaged. If your battery needs replacement, contact
ETS-Lindgren Customer Service.
O PERATING T EMPERATURE
Although NiCd batteries are rated for operation in temperatures from -20 ° C to
+65 ° C (-4 ° F to +140 ° F), operating the HI-3638 in extreme temperatures
significantly reduces operating time. The optimum operating temperature range is
+20
° C to +30 ° C (+68 ° F to +86 ° F).
C HARGING
The HI-3638 battery does not require periodic deep discharges to reverse the
capacity-depleting memory effect caused by repeated shallow discharges;
however, undercharging can reduce battery capacity. Therefore, after the
charging procedure is complete, verify that the battery is fully charged before
resuming field operation.