How Long Do LVAD Batteries Last? (Asked by Everyone, Answered by a Guy Who Runs on Them)
The short answer: In my experience, a pair of LVAD batteries lasts several hours — I swap them a few times over the course of a day. How long yours last depends on your device, your specific batteries, and how hard your pump is working. You wear two at a time, and the golden rule is you never disconnect both at once. Ever.
Quick note: I'm a patient, not a doctor. This is my experience living with an LVAD — your VAD team runs your setup, not some guy on the internet.
The Setup: Two Batteries, One Holster, Zero Chill
Here's what "running on batteries" actually looks like. I wear two rechargeable battery packs in a holster around my waist, both plugged into my controller — the little computer that runs the pump in my chest. Two at a time, always. One battery alone isn't the plan; the pair shares the load.
The batteries are the whole ballgame. The pump doesn't care about your plans, your schedule, or the fact that you're three songs into a gym session. It needs power, constantly, no breaks. So your day gets organized around one question: how much juice do I have left?
So How Long Do LVAD Batteries Actually Last?
Several hours per pair, in my experience. Not "all day" — think in shifts. I swap batteries a few times over the course of a normal day, the same way you'd swap shifts at work. Morning pair, afternoon pair, evening pair, roughly.
What eats battery faster? Your pump working harder, older batteries that don't hold charge like they used to, and cold weather (batteries hate the cold almost as much as I hate leg day). Your VAD team will teach you to read your battery levels on the controller screen — it becomes second nature fast. You glance at it the way you glance at your phone battery. Except the stakes are slightly higher than missing a text.
Living it, not theorizing about it. Watch the Short here.
The Swap Routine: One at a Time, Always
This is the single most important habit in LVAD life, so listen up: never disconnect both batteries at the same time. The pump doesn't get coffee breaks.
The routine goes like this:
- Grab a fresh, fully charged battery.
- Disconnect ONE depleted battery.
- Connect the fresh one in its place.
- Now disconnect the second depleted battery.
- Connect the second fresh one.
One off, one on, new one in. At least one battery is connected to the controller at every single moment. You could do this half asleep — and some mornings, I basically do. But you never, ever rush it into both-off-at-once territory. That's the rule that doesn't bend.
Spares Everywhere: My Battery Stash Strategy
I carry spare batteries the way other people carry their phone charger — except I actually never forget mine, because the consequences are slightly worse than a dead iPhone.
My system: charged spares in the truck, charged spares in my bag, charged spares at home. Everywhere I regularly exist has batteries waiting. When I leave the house, the mental checklist is: controller, driveline secure, spare batteries, backup controller, power cables. It takes ten seconds and it means I never do math in public about whether I can make it home.
The mindset shift is this: running out of batteries isn't an inconvenience. It's the one thing you plan your entire day around not doing. Once you accept that, the rest is just logistics.
The day my battery-powered heart scared me is on camera. Watch the Short here.
Nighttime: Wall Power Does the Heavy Lifting
Here's the part that makes the whole system sustainable: at night, you don't run on batteries at all. You plug into wall power with an AC adapter, and your batteries charge while you sleep.
This is the rhythm of LVAD battery life: batteries carry you through the day, wall power carries you through the night, and the batteries recharge for tomorrow. It's a relay race and you're the baton. (For the full breakdown of how nights work, I wrote a whole post on sleeping with an LVAD.)
My actual bedtime routine, plugging my heart into the wall. Watch the Short here.
Travel Battery Math
Traveling means doing battery math in advance, and the golden rule is: bring more than you think you need. Then bring one more pair.
Every piece of gear — batteries, backup controller, power cables, charging equipment — goes in your carry-on. Never checked luggage. If the airline loses your bag, you need to be fully operational standing at baggage claim, not filing a claim form while your controller screams at you.
I also pack my LVAD center's contact info and know where the nearest VAD-capable hospital is at my destination. Paranoid? Maybe. Alive? Definitely. (Full packing list in my traveling with an LVAD post, coming soon.)
What Happens If a Battery Dies?
The controller tells you. That's the whole point of the controller — it alarms, the screen names the problem, and you swap the dead battery for a fresh one. One at a time, per the rule.
This is why you wear two and carry spares: one battery dying is a non-event. It's a Tuesday. You swap it and move on. The system is designed so that a single dead battery is an errand, not an emergency. The emergency version only happens if you ignore the alarms, skip the spares, and run both batteries dry — which is why you don't do any of those things.
If the controller is alarming and swapping batteries doesn't resolve it, or the hum stops — check your connections and call your VAD team. They'd rather hear from you early.
The night the power went out while my heart was charging. Watch the Short here.
The Bottom Line
LVAD batteries last several hours per pair, you swap them a few times a day, and the entire lifestyle is built around never letting both hit zero. It's the most important routine in my day and also the most boring one — which, as I explain in Living with an LVAD: The Complete Guide, is exactly the goal. Boring means the system works. Boring means you're living your life instead of managing a crisis.
KEEP ON. — and keep 'em charged.
And yes, I've wondered about the lightning thing too. Watch the Short here.
FAQ
How many LVAD batteries do you wear at once?
Two at a time, in a holster around my waist, both connected to the controller. The pair shares the load powering the pump. I also carry charged spares everywhere — in my truck, my bag, and at home.
What happens if both LVAD batteries die?
Don't let it happen — that's the whole game. One battery dying is a non-event: the controller alarms, you swap in a fresh one (one at a time, never both at once). The system is designed so a single dead battery is an errand, not an emergency, as long as you carry spares and watch your levels.
Can you charge LVAD batteries overnight?
Yes — and that's the routine. At night you switch to wall power with an AC adapter, and your batteries charge while you sleep. Batteries carry you through the day, wall power carries you through the night.
How do you know when to swap LVAD batteries?
The controller screen shows your battery levels — you learn to read it like a dashboard. You get a feel for your rhythm fast: I swap a few times a day before levels get low, not after. Waiting until the alarms is amateur hour.