The Powertech range of Lithium batteries have a BMS installed to protect the unit from over-charge or over-discharge, over temperature & short circuit. If this occurs, they only display a voltage below their rated voltage, and will need to be reset.
The vast majority of Lithium battery warranty enquiries our stores get are for batteries used in packs wired to a single charger where the batteries experienced BMS cut-off due to imbalanced charging - they worked fine once their BMS was reset.
How to reset the battery BMS
You'll need a mains power supply or a charger that can be set to power supply mode - e.g. MB3619 for 12v batteries.
Disconnect Load: Make sure nothing is connected to the battery.
Check Terminals: Find the positive (+) and negative (-) terminals of the battery.
Prepare Voltage Source: Get a power supply or another battery that has the right voltage for your battery.
Connect Voltage: Attach the positive (+) and negative (-) terminals of the voltage source to the positive (+) & negative (-) terminals of the battery.
Apply Voltage: Turn on the power supply (not required if using another battery) & wait approximately 60 seconds.
Disconnect Voltage: Remove the connected power supply or battery.
Check Battery: Use a multimeter or battery tester to confirm the BMS has successfully reset.
Reconnect Load: If you had devices connected to the battery before, you can now reconnect them.
If your battery was discharged deeply, recharge it fully before you connect your loads.
If you are still having issues, please contact your local Jaycar store for further support.
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