PRECAUTIONS FOR HANDLING SEALED LEAD-ACID BATTERIES - CONTINUED
3. Preparation Prior to Operation DANGER
(1) Be sure to provide enough insulation around the lead wires and/or plates used between the batteries and the application. Insufficient insulation may cause an electric shock heat generating from a short circuit(or excess current) may result in an injury, burn, smoke or fire.
Do not plug the batteries directly into the outlet or the cigarette receptacle of a car without inserting a charger between the batteries and the outlet or the receptacle. To do so may cause electrolyte leakage, heat generation, or explosion of the battery.
Turn off the circuit switch when the connections between the batteries and the charger/load are made.
(3) When using the batteries for the first time, check for rust, heat generation, or -any other abnormalities. If found, do not use as it may cause electrolyte leakage, heat generation, or explosion.
(1) Since the batteries tend to lose a part of their capacity due to self-discharge during shipment and storage, recharge the batteries before you use them after purchase or long-term storage in order to restore their full capacity. Check for the following conditions before to recharge:
Charging method Constant voltage
Charging condition (at 25°C )
Regulation range of the controlled voltage: 7.25V to 7.45V/6V battery,
V to 14.9V/12V battery;
Initial current: 0.1CA to 0.4CA; Maximum charging time: 24 hours.
Short-time charge is possible when several batteries of the same model, under the same storage conditions can be charged in series. Otherwise they can be charged separately.
Charging current: 0.1CA
Charging time (hours) =[Amount of self- discharge (Ah)/0.1CA]120% Rough estimation of amount of self- discharge is as follows (for an example):
When the storage ambient temperature is lower than 25°C, and storage time is known, assume the following amount of self-discharge: [5%/month] storage months Multiply this by the rated capacity (at 20 hour rate) of the battery
Regardless of the above calculation, the charge time for a refresh charge must be less than 12 hours.
When the storage ambient temperature is higher than 25°C, please consult Panasonic.
4. Unspecified Use CAUTION
(1) Do not place the batteries in an unspecified use or they may leak, generate heat, or explode.
Sealed Lead-Acid Handbook, Page 7