GRAUPNER SJ ULTRA DUO PLUS 80 Instructions D'utilisation page 34

Do not solder directly to battery cells. The temperatures which occur during soldering can easily damage the seals and safety valves of the cells.
If this should happen, the battery may lose electrolyte or dry out, and some of its potential performance will be lost.
Overcharging inevitably reduces the capacity of the battery, so do not recharge a hot pack, or one which has already been charged.
Charging and discharging any battery at a high current shortens the life expectancy of the pack. Don't exceed the maximum values stated by the
manufacturer.
Lead-acid batteries are not capable of being charged at high currents. Never exceed the maximum charge rate stated by the battery manufacturer.
Protect batteries from vibration, and do not subject them to mechanical stress or shock.
Batteries can generate explosive gas (hydrogen) when on charge and when being discharged, so it is important to provide good ventilation.
Do not allow batteries to come into contact with water - explosion hazard!
Never short-circuit battery contacts - explosion hazard!
Batteries can explode or burn, if they overheat. We suggest to use a LiPo-security hard case Order-No. 8370 or 8371 with all Li-battery
types and with NiCd und NiMH-batteries for charging.
Do not open battery cells - corrosion hazard.
It is best to „balance", or even up the cells in Ni-Cd and Ni-MH battery packs by first discharging all the cells separately and then charging up the
pack. Batteries can be discharged cell-by-cell using a charger.
Please don't be surprised if your batteries are not as willing to accept charge in winter as in summer. The ability of a cold cell to accept and store
charge is much lower than that of a warm one.
Battery disposal: exhausted batteries are not ordinary household waste, and you must not dispose of them in the domestic rubbish. The retail outlet
where you purchase your batteries should have a battery recycling container for proper disposal. Trade outlets are obliged by law to accept exhausted
batteries for disposal.
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Operating Manual ULTRA DUO PLUS 80