Vrla charge

[zhaniko93]

my friend gave me battery, where is written: valve regulated lead acid battery, constant voltage charge 15v. i want to charge it directly from dc adapter, which gives 15v dc. the problem is that the battery has 3 wires, black, blue and red and anyone please tell me, which wire is gnd, which vpp, what is the third one for and where to connect? thanks in advance

 

[ronsimpson]

You did not say what battery!\
The extra wire is probably for the temperature sensor. (blue)
You can guess what red and black are for.