Battery Backup Guide

Anil asked:


I have 4 batteries with me.
I have been using for my CANON camera. My camera needs 2 at a time.

Among 4, i think 1-2 batteries are almost done with their job. How do i test all 4 batters and displose the battteries which are almost dead?

Some combinations works well and some gives only 2 mins backup. I dont want to try all 100 combinations. Any easy way?

Jewel C asked:


In my inverter it is written 10A charger.But in meter I can see 3.54A.And My battery is not giving me good backup.How to Increase the battery charging capacity of my 1000wt inverter? My battery is 200ah.how can I full charge the battery in max 6 hrs?

yagerbomb asked:


I have a backup battery for my airsoft gun, it is a lower voltage (smaller) but higher amperage (nimh vs nicad). Will using the charger damage it? it’s a 200ma charger and a 400mah battery, so I should theoretically charge it for about 3 hours but should I change that because of the voltage?

S Babu asked:


What may be its capacity?

asked:


Would it be possible to substitute a thin watch battery for a AA battery in a disposable camera because we found that the camera does not need the whole AA battery. Also, would it be possible to charge the flash by winding the same part used to advance the film? This is for a school project and if you have any other ideas on how to improve a disposable camera, it would really help. Thanks.

Armughan asked:


I have two devices which need to be powered up by -48V DC power. One device has two components IDU and ODU (microwave equipment) the combined power consumption is 40.5 Watt(18.5+22), the second equipment has power consumption of 60Watt (multiplexer). The rectifier also has to charge the batteries for backup.

What will be the rating of the rectifier i should use? also if i need backup of 4 hours what will be the rating of the battery?
Also it will be very helpful if someone can recommend some book or pdf for better understand the power concepts.. like what if i have to make the same calculations for AC power..
Can you mention the required rectifier without battery backup.
If we take battery backup into calculations the backup time required will be 4 hours and recharge time will be 10 hours.

Patrick asked:


I had a 350W AC motor that did not work for this purpose. Do I need to have a DC motor? Also, what type of battery should I use? Obviously, it must be rechargeable so should I go with a lead-acid battery? This system will have a human-powered crankshaft, a motor, a battery, an inverter, and will need to produce 100W maximum to charge my laptop battery through the inverter.

Daniel asked:


Well I’m trying to make a circuit that has a battery backup that picks up if the 12 volt power supply fails, how would I go about doing this? Possibly rechargeable battery as well but at this point ill take what I can get.

penyak asked:


The guy at Best Buy this afternoon told me that an extension cord results in wasted energy and it was better to buy a surge protector with a long cable (more expensive) rather than hook up an extension cord to a surge protector with a short cable (less expensive option). Assume the total cable length is the same. He didn’t hide the fact that he wasn’t sure of his physics but to me it just doesn’t work.

grazingkow asked:


Can I just switch the AC input with the outputs on a surge protector to make it work in reverse, protecting the house from voltage spikes?