You’ve had your smartphone a few years, but let’s face it — that battery just ain’t holding a charge like it used to. Lithium-ion batteries do have a limited lifespan and after a certain number of charge cycles, they start to lose their capacity for power.

If your phone isn’t that old, it may not be the battery’s age that’s making you drag out the charger more than once a day. Make sure environmental factors like exposure to cold, power-draining Android or iOS apps or manufacturing problems — like the unexpected shutdown issue with the iPhone 6S — are not the culprit.

However, if you have to face reality and deal with a tired old battery, here are four options to keep your mobile phone mobile and functional:

1. If you have a smartphone with a removable battery — not an iPhone, obviously — check your phone specs, find an appropriate replacement battery on the web (or at an electronics store) and pop it in yourself.

2. If you have a sealed battery, consider your options. You could replace it yourself using parts and instructions from iFixit or a similar repair site. This does put your phone at risk is you don’t know what you’re doing, but it can be educational.

3. You can try an authorized service provider. Best Buy, for example, can fix a lot of gadgets. (Apple even sends people that way if there’s no Apple Store or other authorized provider in the area.) You could also contact the phone’s manufacturer about battery- replacement services. Apple and Samsung are among those who offer a battery swaps for less than $100.

4. You could punt and get one of those extra-life battery cases like the Mophie Juice Pack, or an external battery to connect to your ailing phone. Not an elegant solution, but you don’t have to crack open the Precious and risk inadvertent damage. You may just feel like Tony Stark in the first Iron Man movie when he had to drag around that car battery to stay alive.

Whatever approach you choose, it will hopefully buy you another year or two with your phone until it’s time to upgrade. And then you’ll have a brand new phone with a brand new battery again — and life will be glorious.