Battery Maintenance; Troubleshooting And Service - Mettler Toledo 64060625 Manuel D'installation

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4.3.

Battery Maintenance

4.3.1. Battery Memory
Older battery technologies (such as lead acid) were prone to cell "memory" problems, meaning that
if they were left to sit in an uncharged state for any period of time, the lead acid cells would
experience almost immediate capacity degradation, causing them to lose power capacity
permanently. The next time the battery was charged it would be impossible to charge it to its
original, full power capacity.
The use of NiMH technology in the intrinsically safe 64060625 battery pack has all but eliminated
this permanent memory problem. However, NiMH cells can experience a temporary memory
problem if the batteries are repeatedly discharged only partially before being fully recharged. Over a
period of time, users would see lower power capacities even after the batteries are charged for a
typical full charge time period. This temporary memory can be erased by depleting each battery to
its lowest charge state and then fully recharging it.
4.3.1.1. Preventive Action
If the intrinsically safe NiMH battery is used so that it is not routinely discharged to its lowest
capacity before being fully recharged, it is recommended that a planned full discharge followed by
a full recharge be carried out approximately every 3 months as a part of standard battery care
procedure in order to maintain full working capacity of the 64060625 battery pack.
4.3.2. Battery Discharge
The NiMH battery pack will continue to discharge slowly while it is connected to the terminal - even
if the terminal is turned OFF. Because of this, it is recommended that the battery pack cable be
disconnected from the terminal when the battery will not be used for a long period of time.
There is also a small, continuous drain of power that occurs in a NiMH battery while it is being
stored. If the battery pack is placed out of service for more than a few days, it will be partially
discharged when it is used again. This is normal behavior of a NiMH battery pack. Be aware of this
effect when storing the battery pack - it may need to be recharged before the next use.
4.4.

Troubleshooting and Service

Only qualified personnel should perform installation and service. Please contact a local METTLER
TOLEDO representative for assistance.
In general, once the 64060625 battery pack is installed for a given application, only routine
inspection and charging is required.
4-4 METTLER TOLEDO NiMH Battery Pack Installation/Technical Manual
To reduce risk of electrical shock, unplug the charger from both the AC mains power and
battery pack before attempting any maintenance or cleaning.
64062816 | 05 | 04/2016