Will the charge efficiency decrease through time?
1614227
The charge efficiency is decided by the inner chip and circuit, but it won't affect much since we get the correct and effective design.
2067109
Your current usage will determine how long the battery will last.If your running it to full capacity,then it mightn't last too long.
210066
The science says yes, an extension slows the charge rate. Better made cables slow it less. If personal experiences like the other people who answered the question say no, I'd assume this is a good quality cable and the charge reduction isn't too bad.
1780798
No, they just slow down during use. The two packs are interchangeable. So I just switch to the other. They charge fast and I have never had a problem with them. They do have an indicator that the battery is fully charged on the charger. It's a small red LED light on the charger.
1805494
I believe you will get faster results with the unit turned off. That is how I charge mine.
1817391
I don't know. I haven't had one completely run down. Their effective use time will get shorter as time goes by. I always charge my battery about every time I use my camera or take along a extra charged battery just in case.Don
1716170
My experience is that it will wear down the battery. The best result is to charge it for three hours only and take it out.
1143079
It depends on the manufacturer and the drain conditions. You can look up the capacity (in milliamp-hours), higher numbers are longer life. The rated capacity will generally decrease with higher discharge rates as well.
1156838
I charge them all the time. I'm sure it may take longer than lower output batteries but I have not measured the difference.
2267936
Yes, may be slower or faster depending on the voltage out and battery volts.
1804825
I usually charge mine every other day but not because it has run down at all.. I've just never gone past 2-3days and still had 1/2 charge left.
1836612
Yes. Unfortunately, the unit I received doesn't retain its charge for much time.
1709255
This unit can take up to 20 hours to fully charge from empty to full. This low-amperage charge is actually a good thing, as it prevents "battery memory," a phenomenon that causes rechargeable batteries to lose the ability to fully charge and discharge. Battery memory will, in short, make your battery's life shorter.It is a bit of an inconvenience for this unit, but once it's fully charged it lasts for a very very long time. Mine lasted on my Droid 4 from Florida to Germany for a week and back to Florida on one charge with heavy usage.
1142704
I've left mine charging for several days, and have never had performance issues with the battery. I know that's purely anecdotal, but its not something I've ever had an issue with.
1886022
Lower amperage will charge your batteries slower. Its the amount of current being put back into your battery.
1063548
Charging does not limit it's functionality, however using the device slows the charge rate, I.E. it will take longer.
2005671
If I charge this and leave it in my car, as back up, will it drain faster under particular conditions?