12.8 - 12.9 volts is a fully charged battery
You cannot use a 12 volt charger to charge 2.6 volt batteries. The 2.6 volt batteries will become hot, very quickly, and explode.
yes
you only need two 12 volt batteries to make 24 volt. connect them in series
Yes, if the two 6 volt batteries were connected together in series.
how Can you charge multiple 12 volt batteries with a car?
Depends on the battery size. If your boat is a 12 volt system and you wire two 12 volt batteries in series you then have 24 volts. If the batteries are 6 volt batteries you will be fine. If you have a 12 volt system on your boat and want to use two batteries then wire two 12 volt batteries in parallel. You will still have 12 volts but will have double the amperage available and this will extend the running time of the batteries.
Two 6 volt batteries in series, yes. In parallel, no.
A group of ten (10) batteries composed of 6 Volt and 12 Volt types will have six (6) each, 6 Volt and four (4) each 12 Volt batteries. The contributing voltages will be 6x6 and 12x4 for a total of 84 Volts.
Depends on the amperage of the batteries you are using. Both setups will give you 36 volts, but you will normally have a longer run time with six 6 volt batteries in series than three 12 volt batteries. That is why golf carts use 6 volt instead of 12 volt batteries.
Yes they do make 9 volt batteries that are rechargeable. There is the Energizer Recharge, NiMH and the HiTech brand carries 4 types of rechargeable 9 volt batteries.
Most 36 volt golf carts are designed to run on a specific number of batteries, usually six 6-volt batteries or three 12-volt batteries. Running a 36 volt system on fewer batteries, such as 5, may result in insufficient power and could potentially damage the cart's electrical system. It's recommended to use the correct number and type of batteries as specified by the manufacturer for optimal performance and safety.
You must hook them up in series. You will need four 12 volt batteries to do this.