Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 59

ROYAL ENFIELD WORKSHOP MANUAL
dirt and moisture from the top of the battery and
ensure that the connections are clean and tight.
4. Servicing
If the battery is subjected to long periods of
night parking with the lights on, without suitable
opportunities for recharging, a low state of charge
is to be expected.
Measure the specific gravity of the acid of each
cell in turn with a hydrometer (see Fig. 3).
Section G4a Page 2
The following table shows the state of charge
at different values of specific gravities
If the battery is discharged, it must be
recharged, either on the motor cycle by a period
of daytime running or from an external D.C.
supply at the normal recharge rate of 1.5 amp.