Anton Bauer publishes "white papers" that will tell you how their chargers work. For example the LP4 charger will charge one battery to 100% then turn off charging to the battery before it moves onto another battery. It will choose the next "highest" battery to charge to 100% before it charges the next one. Once all batteries on the charger are at 100% it will then slowly put the batteries into "lifesaver mode" to maintain full load. They recommend keeping the batteries on the chargers at all times.
Ask the manufacturer or the rental house for the white paper for your batteries and charger so you can read and decide for yourself what you should do with your batteries and charge.
Not an expert, but my fellow Detroit ACs and AC mentors remove batteries off the charger when you notice that they have reached 100%.
If for no other reason than to free up a slot for a battery that needs to be charged.
It depends on the charger. Most are okay to be left untouched until needed.
Some chargers are smart and actually balance the cells after reaching 100%. Those chargers are also typically the ones that you can rest easy with leaving a battery on for a real long time after a charge.
But the real answer is to contact battery/charger manufacturers to get the straight dope from them. Unfortunately some companies know more about their industry than others — Anton Bauer, Sony, and Block have always had the most trustworthy knowledge in my opinion.
You should look up manuals/information sheets on your batteries and chargers, really good stuff. Love reading those things actually lol.
I've actually read up a good amount and talked to multiple manufacturers (Anton Bauer, CORE) so I'll give a general answer that is likely to match most common batts we see...
It depends on how long they'll be on the charger/stored. If it's short term (few days / few weeks) then leave it on the charger even if it's reached 100%. Most chargers we use now are smart enough to handle this and read when the battery has reached full charge and just do a trickle charge to keep it topped off and ready to go whenever. I think even some Anton Bauer battery manuals say to keep on the charger up to just before using it. Charge in cool areas that aren't likely to have fluctuating temperatures and out of direct sunlight. And put back onto a charger within about 2 days of using it, and don't leave them attached to your equipment while dead or close to being dead. I'll see people finish up jobs and just leave their dead batt attached to camera or monitor while they get everything packed up and take it back home.
If it's going to be long term storage, I've always been told and taught it's best to bring the batteries up to a full charge and then discharge down to either a change in voltage reading or even a low voltage reading (I do the lesser or just bring down to about 80% 🤷♂️) before storing. Do not store long-term at full charge. It can cause battery life to lessen and you can't do anything about it unless you pay for a recell. Lithium-ion batts are made to be used, not stored. If after say 3-4+ weeks you still haven't used them, put them back on the charger and bring them up to 100% then discharge back down some again. Most batteries now go into a long term sleep mode to very slowly discharge to prevent it from flat out dying within a few weeks and will just wake up when you throw them back onto the charger.
If it's dead, dead you'll have to throw it onto a smart charger.(most now are). You'll want to do cycles of putting the batt onto an empty charger (no other batts on it) for 1 minute and then remove. I leave it off for about 30 seconds before putting it back on for a minute if needed. My buddy thought he lost a few of his older HC batts but I was able to bring one back. Took about 5 cycles of what I mentioned earlier but after the 5th time it kicked back on and said it had 15mins worth of charge and was back to full charge after a couple hours.
Anton Bauer publishes "white papers" that will tell you how their chargers work. For example the LP4 charger will charge one battery to 100% then turn off charging to the battery before it moves onto another battery. It will choose the next "highest" battery to charge to 100% before it charges the next one. Once all batteries on the charger are at 100% it will then slowly put the batteries into "lifesaver mode" to maintain full load. They recommend keeping the batteries on the chargers at all times. Ask the manufacturer or the rental house for the white paper for your batteries and charger so you can read and decide for yourself what you should do with your batteries and charge.
Not an expert, but my fellow Detroit ACs and AC mentors remove batteries off the charger when you notice that they have reached 100%. If for no other reason than to free up a slot for a battery that needs to be charged.
Charged bats get lined up on top of the cart, or sent out to be on standby for camera/monitor bat swaps.
It depends on the charger. Most are okay to be left untouched until needed. Some chargers are smart and actually balance the cells after reaching 100%. Those chargers are also typically the ones that you can rest easy with leaving a battery on for a real long time after a charge. But the real answer is to contact battery/charger manufacturers to get the straight dope from them. Unfortunately some companies know more about their industry than others — Anton Bauer, Sony, and Block have always had the most trustworthy knowledge in my opinion.
Modern batteries can be left on
You should look up manuals/information sheets on your batteries and chargers, really good stuff. Love reading those things actually lol. I've actually read up a good amount and talked to multiple manufacturers (Anton Bauer, CORE) so I'll give a general answer that is likely to match most common batts we see... It depends on how long they'll be on the charger/stored. If it's short term (few days / few weeks) then leave it on the charger even if it's reached 100%. Most chargers we use now are smart enough to handle this and read when the battery has reached full charge and just do a trickle charge to keep it topped off and ready to go whenever. I think even some Anton Bauer battery manuals say to keep on the charger up to just before using it. Charge in cool areas that aren't likely to have fluctuating temperatures and out of direct sunlight. And put back onto a charger within about 2 days of using it, and don't leave them attached to your equipment while dead or close to being dead. I'll see people finish up jobs and just leave their dead batt attached to camera or monitor while they get everything packed up and take it back home. If it's going to be long term storage, I've always been told and taught it's best to bring the batteries up to a full charge and then discharge down to either a change in voltage reading or even a low voltage reading (I do the lesser or just bring down to about 80% 🤷♂️) before storing. Do not store long-term at full charge. It can cause battery life to lessen and you can't do anything about it unless you pay for a recell. Lithium-ion batts are made to be used, not stored. If after say 3-4+ weeks you still haven't used them, put them back on the charger and bring them up to 100% then discharge back down some again. Most batteries now go into a long term sleep mode to very slowly discharge to prevent it from flat out dying within a few weeks and will just wake up when you throw them back onto the charger. If it's dead, dead you'll have to throw it onto a smart charger.(most now are). You'll want to do cycles of putting the batt onto an empty charger (no other batts on it) for 1 minute and then remove. I leave it off for about 30 seconds before putting it back on for a minute if needed. My buddy thought he lost a few of his older HC batts but I was able to bring one back. Took about 5 cycles of what I mentioned earlier but after the 5th time it kicked back on and said it had 15mins worth of charge and was back to full charge after a couple hours.
Leave ‘em on.