Yamaha RD250 Owner's Manual page 38

Battery
The life of your battery depends greatly
on how well you keep it serviced. In
order to service it completely and correct-
ly, there are certain facts that you must
know.
Maintain the battery fluid level between
the upper and the lower lines check the
level at least once a month. A d d distilled
water it the level is low.
Note:
When installing the battery, take care
not to flauen the vent tube.
When the mach ine is not used for
more than a month, the battery should
be recharged once a month by your
dealer.
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