westend wrote:
FLA 6V batteries will lose electrolyte during charging. I would suggest to start with a three month interval and observe levels within the cells. Usage and temperature dictates electrolyte loss so there is no standard interval. My 6V's tend to use up more electrolyte as they are charging off a solar panel each day. I check them about every three months for the correct level.
Thanks. This is the nearest I’ve had to an answer. It is also close to what I was expecting, but wanted to hear it from someone with experience.