For same size and weight, will alkaline batteries last longer or shorter than lithium ion recharageable batteries?

I am not just talking about new batteries here. When I use lithium rechargeables I notice that they seem to quickly degrade and last for a lot less time than they did when they were new, so I am asking about typical time, in other words, after the device has been used for at least 3 months and been recharged at least 20 times.

For example, let's say I have a walkie-talkie with a rechargeable lithium ion battery. I use it for 3 months and recharge it 20 times. Will the device last longer, as long, or less long, than if it had the same weight of alkaline disposable batteries?

  • \$\begingroup\$ What was your average discharge time/10h (%), Depth of Discharge <10% (really weak) How much above 4.1 was the Charge Voltage? 0.1V typ. But not ideal or more (bad) What part number is it? ( got link?) How many cells of each? Ideally it should last longer until 200 cycles or so unless you can answer above. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 7 '18 at 12:50
  • \$\begingroup\$ @TonyStewartolderthandirt That is my whole point. I don't want to worry about things things depth of discharge. The reality is that I typically use things till they run of juice. I know that is "bad" for the battery, but that is the practical reality. I want an answer that reflects real life, not some of kind idealized fantasy in which people never deplete their batteries before recharging. \$\endgroup\$ – Tyler Durden May 7 '18 at 13:40
  • \$\begingroup\$ If you are wise do not equate my reality to yours and think about my questions and answer if you can otherwise your experience is an isolated case \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 7 '18 at 15:04
  • \$\begingroup\$ It’s like asking someone how often does the average person get tooth fillings or replacements when they don’t want to think about cleaning after a snack or meal., knowing that’s generally bad hygiene. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 7 '18 at 15:07

For the same size and weight, Li-ion can hold ~20% more charge than an alkaline cell. link. Since Li-ion provide a higher voltage, 4.2V to 3.6V compared to 1.5V to 0.9V, the usable charge is also higher.

  • \$\begingroup\$ And that’s for 1 charge cycle \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 7 '18 at 12:55
  • \$\begingroup\$ The question is about after the battery has been used for 3 months and charged 20 times. Assume that in many cases the battery was fully depleted before recharging. \$\endgroup\$ – Tyler Durden May 7 '18 at 13:42
  • \$\begingroup\$ It really depends on the battery, charger quality, discharge depth and lots of other parameters. A good quality cell, with proper charge/discharge protection can have 500 charge cycles with 90% charge level retention. An abused cell might last 3 charge cycles and be useless after that. \$\endgroup\$ – Lior Bilia May 7 '18 at 14:03
  • \$\begingroup\$ @TylerDurden: ROUGH estimate for fully depleted penalty is 1% per charge, so about the same. \$\endgroup\$ – dandavis May 7 '18 at 17:55

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.