Author Options:

extremely long lasting batteries Answered

Hello I’ve been looking for extremely long lasting batteries as my current a simple 9v battery will not last long enough. Does anyone know of a really long lasting battery pack? Or what about stacking 9v batteries ? Has anyone tried stacking 9v’s ? Any help will be greatly appreciated Thanks


Awesome you guys just help me out a bunch their with that. Not only is that interesting but very cool. I would have like to know that before as batteries do cost so much. Anyway I’m going another route now I think. This device also has a 12V DC plug. What do you think of simply taking the plug and splicing it and connecting it to a few of those super power 9v’s ??? I think it’d work very well as this device probably has a power converter if it takes batteries and an ac adapter for different voltages. (right?) As soon as I finish this project I’ll post it ;) Thanks for all the help

Okay well from my research the thing I’m modifying has a voltage converter, so I think that should be fine.

Now I’ve been looking around on the internet for the most powerful rechargeable 9v’s I can find. But unfortunately all the rechargeable ones I find are pretty weak.

I have found this disposable one though that are very strong:


Anyone know of an extremely powerful rechargeable one?

I am pretty sure you can recharge normal alkaline batteries..

I agree with westfw six 1.5 batteries in series. otherwise look at whats sucking up all the power in your device can you modify it? or convert to AC to DC tranformer with messy wires are wires bad? is size a consideration?

I don't know about the 9v, but I have heard that all rechargeable batteries quit after so many recharges, set by the factory. Is that true and is there a way around that?

It's not set by the factory ;) Rechargeable batteries wear out over time and use.

Thank you very much for the explanations . Okay so this is my idea. The items I’m modifying have: Battery Type: Quick Swap 3.7 V/ 1.8 Amp Lithium and 7.6V 1800 mAh rechargeable Li-ion battery My idea was to take out the batteries inside the unites then find the polar metal attachments and solder a 9v battery clip and string them till it gives me enough power. Would this work out well?? Also is anyone know of a tutorial that would should how to string up 9v batteries I’d be very appreciative. Thanks again for all your help

I've tried with some sony info lithium types. Cracked three, no dice on any of them. If some one knows please share.

I don't know what devices those are... but you could cause problems putting 9V to it because it only takes 3.7 and 7.6 volts. Also -- re-read westfw's post ;) A 9V battery has a capacity of about 500mAh -- the batteries you're replacing have over double that. So IF the device does not "fry" from putting 9V to it -- it won't stay on as long as the original battery. It kinda sounds like a cell phone (mine uses a 3.7V battery). You may have problems if the device tries to recharge the 9v battery. Rechargeable Li-on batteries also have more than just two connections to the device (usually a temperature sensor).


11 years ago

batteries are rated in "Amp Hours" (AH. or mAH - milliamp hours. 1 AH = 1000 mAH); roughly, how many hours they'll provide 1A of current. In theory, a 1AH Battery will provide 1A for one hour, or .1A for 10 hours. (in reality, there's a "target" current, usually far below one amp, above which performance is going to be less.)

Total energy is Watt-Hours, or AH time voltage.

A "standard" 9V alkaline battery has a capacity of about 500mAH, or 4.5WH. A "good" NiMH rechargable AA battery has a capacity ofabout 2500 mAH, or 3.75 WH. If you connect 6 or 7 AA cells in series to get about 9V, the resulting battery pack ought to last about 5 times longer than a normal 9V battery. Even TWO AA cells with a boost converter has more energy than a 9V without being much bigger (and cheaper, too!), but your electronics gets more complicated.

Well.... what are you doing?

You can wire a battery in parallel to increase battery pack capacity. But technically, they last the same amount of time (per battery).

You can reduce power consumption off the battery. Kinda like cyclists and bicycles. At some point, a change in rider will greatly improve performance compared to changing the bike :P