How low can I safely and repeatedly discharge the THUNDERBOLT MAGNUM SOLAR 12 Volt, 35 Amp Hour Universal Battery?
I have read blogs that say 50% although that varies but most often I see down to 11.9volts only which is not near the 6.5 Volts which I was expecting due to the rating of AGM batteries saying 50% was acceptable.
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You may want to look for the manual but it is mostly caused by a bad battery. The battery may be discharged far and many chargers are not capable to charge batteries being even close to full. Green means charging and red is fail. It keeps trying. A broken and useless battery may show the same indicators flashing. Inspect the battery to make sure it is in a good condition, like acid at about the right level and no traces of melting on the container or visible loose/bent plates. Put a voltage or multimeter on 20 Volt at its terminals and determine the battery has any voltage to begin with. 11Volt indicates an empty battery and 12,8 to 13,2 is probably full. An empty 12 Volt battery is charged with a 12 Volt ~ 1 Amp power adapter (maximum 1/10 of battery Amp but not until fully charged) and preferably a 1 Amp fuse in the + line. This is "attended charging," meaning things must not get hot and charging is stopped before the battery is full. Then try the charger again, always the 12 Volt clamps attached first and next the plug in the mains. Disconnecting is in reverse order.
Bad batteries often have sulfur on their plates and can be revived by fast discharging but the success rate is low. Meaning a battery can be better but not good enough. Batteries have a life of 5 years and closer to 10 when always charged. When charging was low and often not, the battery could have died after two or three years. This apart from a limited number of charge-discharge cycles. The test is with all lights on and then not dimming in the first minute or after ten seconds. Good batteries must hold charge for a week and not much less every day.
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If it is a 12 volt Size U1 - yes. (UB12350, GPC1234, GPL-U1, NP33-12B)
The amp hour rating is dependent on use and manufacturer of the battery. It is the size and voltage that matters. AGM batteries generally have a slightly lower AH rating but recover better from deep deep discharging cycles. (Available at marine stores)
The amp-hour rating affects how long the chair will travel between chargings.
This charger is a maintenance charger and will not have enough power to charge a dead battery. It is used to trickle charge a battery to keep it charged and to off set any parasitic drain.
Hi.Sounds like your batteries have sulphated plates, this happens when they sit for too long without being used. Your machine is a 24 volt system, so it needs both batteries to be working.You might be able to get a bit more life out of the batteries.
Try removing both batteries from the machine and connecting a light bulb across each battery and discharging them until they are flat.
Then using a 12 volt charger, ( not the charger for the machine, which is a 24 volt charger ), charge the 2 batteries in parallel. Sometimes it helps to charge them up the wrong way for a few hours, then discharge them again with the light bulbs. After this charge them again in parallel with the 12 volt charger, this time the correct polarity, a leave on charge for 12 hours.
You might have to repeat the charge, discharge cycle a few times.
The batteries will accept a charge after a bit of this, but they might not be as good as new batteries.
If you are unsure how to do this, get some help from someone who can do the work safely.
Good luck. Neil.
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