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i have 3 X 12V battery i use them to drive a dirt bike .i want to charge them with a 36v-30A power supply the maximum charge current is 6 amps that is given by the manufacturer . will this damage my battery packs ? more over how many amps would the battery draw? i am not using current limiting circuits

  • 3
    \$\begingroup\$ Enough to blow it up. Which is why we don't do that. \$\endgroup\$ Jul 22, 2018 at 1:03
  • \$\begingroup\$ 6 amps that is given by the manufacturer ... charger manufacturer or battery manufacturer? \$\endgroup\$
    – jsotola
    Jul 22, 2018 at 5:46
  • \$\begingroup\$ battery manufacturer? \$\endgroup\$ Jul 22, 2018 at 7:42
  • \$\begingroup\$ TL/DR : Use current limiting circuits. \$\endgroup\$
    – user16324
    Jul 22, 2018 at 12:04

2 Answers 2


To properly charge three 12 volt lead-acid batteries connected in series, you will need about 43 volts, but should limit the current to under 4 amps or so.

A 36 volt charging source will leave the batteries well below full charge.


A power supply rating does not indicate how much it will "charge" a battery. It's the max current that can be drawn from the device until it shuts down/blows a fuse/etc.

With that being said, it has the capability to exceed the max charging current of your batteries. Which is nooo bueno.

It may be better to use some purpose built led acid chargers and charge the individual batteries. These purpose built chargers have the necessary safe guards in place to make sure not to blow up your battery and switch to a trickle charge mode after the bulk of the charging is done. These types of batteries require that extra bit because they self discharge much faster than other chemistries.

  • \$\begingroup\$ it will be hard to access each battery individually i just came up with an idea i am not sure if it is gonna work or not . i will add a current sensor connected in series with the battery and a solid state relay also in series and i will control it with arduino i am not sure if this is gonna work or not ? \$\endgroup\$ Jul 25, 2018 at 20:07

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