6 Volt Battery Won't Charge
6 Volt Battery Won't Charge. You have to find out why the voltage drops to 4,3 then 0. Hold the red clamp on the positive end and black on the negative end of the rechargeable battery for no longer than three seconds.

A failure in the converters cooling fan; With a bench charger set to ~5 amps and 3.65 volts charge each cell until it reaches 3.625 volts as measured at the cell terminals. You’ve also not been clear about your solar setup;
If That’s No Issue, It Might Be The Battery Problem.
After you sort out all the wiring from the battery and starter, check all the wiring in the charging system. Since the terminals on 6 volt batteries are on diagonally opposite corners, it's easy to. Check thoroughly if you are drawing within the right parameter.
If The Voltage Is Above 8 Volts, The Battery Is Overcharged And Needs To Be Removed From The Charger.
12 volt deep cycle battery wont charge thanks for the replies. If all good, then i suspect the regulator or possibly a weak cell in the battery may be the culprit. For example a 220 amp hour battery (220 amp hour @ 20 hour rate) will require an initial start up rate of 22 amps to be supplied by the selected battery charger.
Attach The Red Lead To The Positive Terminal And The Black Lead To The Negative Terminal.
Because the batteries have not been used for two years the plates in the batteries have more than likely sulfated which makes them hard to impossible to recharge. Use the red clamp and tap the positive end of the battery three times. You’ve also not been clear about your solar setup;
Charge At Battery Charge Voltage Until The Bms Disconnects The Battery.
Be careful to stop the charge precisely at 3.625 volts. Second method, if you don't have a 'dumb' charger: A failure in the converter’s thermal sensor;
Failure Of A Diode Or Other Circuit Board Component
If the voltage is below 6 volts, the battery is discharged and needs to be recharged. If it’s a sealed lead acid battery, 6v. Wait overnight for the cells to settle.
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