A pair of fully charged HeartMate 3 batteries gives you up to 17 hours.
That number is a ceiling, not a plan. It assumes good batteries, moderate activity, and settings that suit it. Most people get less, and the ones who have been doing this a while plan for less on purpose.
Your manual and your VAD coordinator are the authority on your equipment. The figures below come from Abbott's HeartMate 3 patient documentation and are here for orientation. If your team told you something different, go with your team.
How Many Hours You Actually Get
Two 14 volt lithium-ion batteries power the controller at a time. Fully charged, the pair is rated for up to 17 hours. Recharging takes about 4 hours.
Runtime drops with pump speed, battery age, and how much you are moving. A two-year-old battery does not hold what it did new. Neither does one that has spent six months in a drawer instead of a charger.
Each battery has five lights showing what is left in it. The controller shows the same thing. Check both before you leave the house, not after the alarm reminds you.
Two Different Questions
People ask "how long does an LVAD battery last" and mean one of two things:
- Runtime on a charge. Up to 17 hours for a HeartMate 3 pair.
- Service life before replacement. Batteries lose capacity as they age and cycle. Your VAD programme tracks this and swaps them on a schedule.
Ask your coordinator when yours are due. And if one battery starts running down noticeably faster than its partner, say so. That cell is ageing out.
Always On Power
The controller needs two power sources connected at all times. Batteries or wall power, never neither. This is why you change batteries one side at a time.
If your training gave you a specific changeover sequence, use that one. It exists so you never end up with both leads off at once.
How Many Spares
Leave the house with a charged spare set. Every time.
Most programmes send people home with around eight batteries in rotation: two worn, two in the bag, the rest charging. The exact number varies by centre, so confirm yours. The rotation matters more than the count. Batteries that live in the charger stay useful. Batteries that live in a drawer quietly stop being spares.
When the Alarm Goes
The controller alarms before you are in trouble. That is the whole point of it. Swap to a fresh battery when prompted, one side at a time, and move to wall power if you are home and running short.
Learn what each alarm looks and sounds like while you are sitting on your own sofa. Not for the first time in a car park with a trolley full of shopping. Your VAD team will walk you through them, and once you know them the noise stops being frightening and becomes a task.
What happens if an LVAD battery dies outright: the alarms escalate, and the pump depends on the remaining power source until you restore the other one. Swap to a charged battery straight away, or get on wall power. If you cannot restore power, follow the emergency steps your team trained you on and call them. This is the scenario the spare set in your bag exists for.
Charging
Batteries charge in the unit supplied with your system, roughly 4 hours each. Three habits that make this easier:
- Put a battery back in the charger the moment you take it off. Not "in a minute".
- Keep the charger somewhere you walk past every day.
- Know where your wall power connection is and keep the path to it clear.
What They Cost
For nearly everyone, nothing directly. Batteries are part of the device system. They come through your VAD programme and are billed to insurance or Medicare as durable medical equipment, not bought retail.
If someone has quoted you a price, or you are worried about coverage, ask your coordinator or the hospital's financial counsellor. They handle this constantly and know which assistance programmes apply. We are not going to print a number here, because what you would actually pay depends entirely on your plan and your programme, and a wrong figure helps nobody.
Carrying Them
This is the part nobody prepares you for.
You are carrying about a kilogram of equipment on your body from the moment you get dressed. The holster bag that came with the system is functional. Comfortable is a different question, and it is the one that decides whether you go out.
People try most things: the supplied holster, a battery belt, a shoulder-worn battery pack, a pouch on a strap, fabric battery holders sewn into clothing. There are patterns in what people keep using.
- Split the weight across both sides. Both batteries on one hip pulls your posture over and hurts by mid-afternoon.
- Keep it close to your torso. Equipment that swings pulls on the driveline and catches on door handles, chair arms, and seatbelts.
- Protect the exit site. Nothing presses, rubs, or tugs there. Any setup that puts tension on the driveline is the wrong setup, however convenient it looks.
- Test it sitting down. Plenty of arrangements feel fine standing and dig in the second you get in a car.
Garments with built-in pockets hold the batteries flat against the body instead of hanging them off a belt, which handles most of the list at once. Our LVAD shirts and tank tops carry the controller and batteries in reinforced pockets under ordinary clothes. The shorts and leggings do the same lower down, which some people prefer in warm weather or overnight. The shirts collection has them together.
Staying Invisible Under Clothes
Most people want the equipment to disappear, not to be explained. That is mostly about where the bulk sits. Pockets flat against the ribs vanish under a layer. Anything riding at the waistband announces itself.
Compression fabric helps because it holds the batteries still. Equipment that shifts as you walk is both more visible and more likely to tug where you least want it.
Who This Isn't For
If you are newly implanted and still working out your routine, do not take rearranging your equipment as a project this week. Get comfortable with the system your team trained you on first. The carrying setup can change later; the training should not.
And if you are on a device other than a HeartMate 3, the runtime numbers here do not apply to you. The carrying advice still does.
The Point
Battery management stops being interesting after the first month. It becomes something you do without thinking, like checking you have your keys. Getting there faster is mostly a matter of building the rotation habit and finding a way to carry the weight that you forget about.
We keep a longer list of questions on the LVAD clothing FAQ, covering HeartMate III and HeartWare compatibility, HSA eligibility, and sizing. Our guide to HeartMate 3 accessories goes wider than batteries.
Your team knows your device. We know what it is like to wear one all day.