You can ruin an otherwise good battery by overcharging it. Most auto battery chargers shut off automatically when the battery is fully charge, but there are manual chargers that do not. If you use a manual charger then be careful and do not over charge the battery.
they get thrown out no, they get recycled
Rechargeable batteries that are not charged for a long time will still work sufficiently. Batteries that are overcharged will damage the battery.
Yes, charged batteries are typically heavier than uncharged batteries due to the presence of stored energy in the charged batteries.
Yes, all automobile batteries can be charged.
Dead battery -will no longer charge.
It won't matter as it will stop sucking sunlight.
Frozen batteries last longer unfrozen batteries.
No, batteries do not get heavier when they are charged. The weight of a battery remains the same regardless of its charge level.
Yes, charged batteries weigh slightly more than discharged batteries due to the additional mass of the stored electrical energy.
You can buy batteries for around $25-$35. I have an older Nikon camera and still use the same battery that it came with. However, I believe the newer batteries stay charged longer.
An electric car needs to be charged until the indicator on the charger says the batteries are charged. It will depend on the amperage of the batteries, the way the charging mechanism works, and the percentage of discharge of the batteries.
The best kind of rechargeable batteries are the hybrid Eneloop batteries because they come fully charged and they have an extensive life. They can hold a charge 6 months and sometimes even longer and are worth the cost in the long run.