RE: Best Way to charge gel 7a 12v on way to field?
Please remember people to include a fuse as Jnorton has stated above because if your gell cell battery has less voltage than what is being supplied at the cigeratte lighter socket then you will have huge current flowing through the wires to the small gell cell battery. It is safe, however to hook up a Gell cell battery if it is charged because it will have the same voltage potential as that being supplied by the cigeratte lighter socket and thus there will be a net voltage drop across the wire's resistance of zero and therefore 0 amps of current flow.