9 Battery chargers
9.1 General
Battery chargers need to be provided with a means to prevent accidental change of output voltage
or battery type in cases of poor vision or manipulative skills of the user.
Expensive batteries are easily damaged by incorrect charging so it should be clear for which type of battery the charger is set.
Both the battery set and charger can be damaged by reverse polarity connection if protection is not provided. Even with polarized plug-socket combinations, mistakes can be made when fitting
replacement batteries.
It is important to users that they know that their battery set can be recharged overnight so this information should be given on the battery charger.
If a charger is connected to a battery set that gives off flammable gas, and current flows
immediately, sparks may ignite the gas. It is therefore essential that a delay occurs between the connection of the battery set to the charger, and the flow of current, to prevent such sparks.