Velleman projects K8012 Assembly instructions - Manual (Page 16)

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20. Operation & troubleshooting
Operation & troubleshooting
Operation:
When a discharged battery is connected to the unit, it starts charging it with the maximum current (0.3A for batteries <4Ah,
1A for batteries >4Ah), until the battery voltage reaches 14.7V (7.35V for a 6V battery).
Once this voltage is established, the charger adjusts the charge current, in order to keep this voltage steady.
At the end of the charging cycle, when the charge current has dropped significantly, the output voltage is dropped to 13.6V
(6.85V for a 6V battery). This allows the battery to remain hooked-up to the charger without any risk for an indefinite time.
Should the battery discharge, then the charge cycle will restart automatically.
Troubleshooting:
If you have successfully completed the above tests, there is not much that can go wrong.
If the unit never leaves the ‘charge’ cycle, this could point to either a defective battery, a too low charge current setting, or a
battery with a too large capacity.