Tait T3010II, Operator'S Manual

29

Battery Problems

NiCd batteries sometimes exhibit a symptom commonly called

“memory effect”.  This is a term used to describe the perform-

ance of a battery that has regularly only been partially dis-

charged before recharging and seems to “remember” where it

previously stopped discharging.  When the battery reaches this

discharge point, the voltage drops prematurely and the radio

gives a “low battery” indication.  Consequently the battery only

operates with a reduced capacity.  While NiMH batteries suffer

less from memory effect, it is recommended that both types of

battery be subjected to regular full discharge and charge cy-

cles, as outlined in “Battery Use” above.
A battery suffering from memory effect can often be restored

to full capacity by deep-discharging using a suitable charger

with an inbuilt discharge function (eg T3002).  After discharge

the battery will be immediately fast charged to capacity.  In

cases of severe memory effect it may take a number of dis-

charge and charge cycles to restore the battery to full capacity.

See your charger manual  for full instructions.  Alternatively

the battery can be returned to your dealer or service agent for

reconditioning using an approved battery analyser/recondi-

tioner.
The performance and lifetime of both types of batteries may

also be reduced by prolonged overcharging.  NiMH batteries

are most prone to damage from overcharging, but NiCd batter-

ies can also have their life reduced.
Under certain environmental conditions, the terminals on the

battery may exhibit tarnishing.  This in turn may lead to unre-

liable operation, either while in use or during charging.  Typi-

cal symptoms might be that the radio turns itself off for no

apparent reason, or that it fails to charge properly.  The tarnish

can be seen as a dull discolouration on the terminal, which

prevents it from connecting effectively to the radio or charger.

In such cases it is recommended that the tarnish be removed

by gently rubbing the affected terminals with a standard pencil

eraser.