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We recommend that you do not leave the battery charger plugged in all the time.  In some cases, this may cause premature damage to the 12 volt battery, reducing its ability to store a charge, although this is less likely with newer chargers and batteries.

You should use the RBT IV until the instrument indicates a low battery condition on the display.  Then connect the battery charger for 8 – 12 hours.   Leaving it plugged in overnight or over a weekend is acceptable.

It should be noted, however, that the 12 volt rechargeable battery will eventually become so depleted that the instrument will not operate even if the battery charger is plugged in.  When this happens it is time to purchase a new battery.  A replacement battery can be ordered in the Products section of this website or through Customer Service at (314) 429-4000.

Sealed Lead Acid Battery – 12V – 2.3Ah


1. Important safety considerations:
o Do not incinerate.
o Do not directly connect the negative and positive terminals.
o Do not use other than the specified battery charger.

2. To prevent deterioration or damage to the battery:
o Do not drop or subject to strong physical shock.
o Do not use to power equipment other than specified.
o Do not use below –10ºC (15ºF) or above +40ºC (105ºF).

3. To ensure long battery life:
o Do not discharge completely—the SLA battery must always be stored in a
charged state.
o The SLA battery does not lend itself to fast charging—typical charge times are 8
to 16 hours.
o The SLA battery can be stored for up to two years but must be kept in a charged
o A periodic topping charge, also referred to as ‘refreshing charge’, is required to
prevent the open cell voltage from dropping below 2.10V.


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