On 13/05/2014 04:54, Bill Wright wrote:
Given two 12V lead acid gell batteries, both new, both the same type,
but from different sources, how do I balance the charge before fitting
them in a 24V appliance?


Personally I would have got identical batteries as different makes will
likely have different characteristics.

Given the starting state may be different for each battery I would place
them in parallel and charge with a charger designed for gel batteries
that hopefully has a tight charging spec.

Is this for an alarm or similar, where the batteries will be
continuously float charge in situ?