Copyright © Shimmer 2017
Realtime Technologies Ltd Shimmer User Manual
All rights reserved Rev3p
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You should perform a periodic wipe-down of the case with an antiseptic wipe or, according to the
standard operating procedure used on any piece of equipment in the place of operation. The
external connector should be swabbed with a fine brush.
If you are using Shimmer in the presence of biohazards, treatment with a disposable wrap or cover is
required according to best practices. Biohazard contamination will void warranty and contaminated
devices returned to Realtime Technologies or any Shimmer address will be disposed of in accordance
with applicable laws.
Replacement cases are available for purchase.
3.5.2. Inspection
The battery should be periodically inspected, at least weekly. Due to the unpredictable usage
patterns of a research device, premature aging or failure may occur. If the battery seems "puffy" to
the extent that it is impacting the fit of the enclosure (>1mm) or the integrity of the battery pack has
been compromised by a puncture or abrasion you should contact customer support immediately for
service.
3.5.3. Battery Replacement
Please note that any modification to the Shimmer hardware, while the device is within warranty, by
any person/organization other than Shimmer will void said warranty.
The Shimmer units are supplied with a 3.7V 450mAh re-chargeable Lithium Polymer battery but the
design supports both Lithium-Ion/Lithium-Poly cell chemistry as well as lithium coin cells and alkaline
batteries. The battery should only be replaced by qualified personnel. Shimmer offers a battery
replacement service or, alternatively, a battery replacement kit with an instruction manual and
video. For further details contact info@shimmersensing.com.
The Shimmer uses a diode wired-OR to prevent device damage from reversed battery leads and
allow operation from external power while charging.
The Texas Instruments LM3658D Smart Li Charger is used for battery management. The LM3658D
implements a multi-phase charge profile including battery conditioning and overcharge protection.
The default Rset resistor value of 22.1kΩ provides conservative 125mA charge limiting. The included
450mAh battery pack includes secondary failsafe protection against over/under voltage and over-
discharge - all user-selected or installed batteries must provide secondary failsafe protection. The
maximum discharge current on the supplied battery is 3.360A, a rate far exceeding expected
conditions for sensing applications.
There is no limit on battery capacity but the charger has a safety circuit and will time-out after
6.16hrs. Due to the charge current being preset at 125mA the max charge capacity is 770mAh. The
charge timer can be reset by removing the Shimmer, waiting for about 15 seconds and then
reinserting. With large capacity batteries, Shimmers should be turned off while charging to reduce
current loss from BT radio or other active components. Note that for Shimmer3 the charging LED
indicator does not represent the charging state when the Shimmer is switched off.
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