Sizing Backup Power for Your Medical Devices
Last verified: September 2026
How to size a backup battery for medical equipment the honest way — read each device's label, ask your supplier how many hours you need, add up what runs together, and leave a cushion. Rather have a hand? My number is (330) 200-8042.
Sizing Backup Power the Honest Way, at a Glance
"How big a battery do we need?" is a great question — and the answer comes from your device labels and your supplier, never a guess. This guide walks through reading the label, asking how many hours you need, adding up what runs at once, and leaving headroom — with no invented wattages or runtimes. It is not medical advice — your supplier and doctor set the hours. There's a printable 29-page version up top.
Common Questions
1 How big a battery do I actually need?
It comes from your device labels and how many hours your supplier recommends. Bring me both and I'll size it — I won't toss out a number without them.
2 Why won't you just tell me my CPAP's wattage?
Because the honest number is on your device's own label and varies by model. I read it off rather than guess, so your sizing is actually right.
3 What's the difference between watts and watt-hours?
Watts are how fast a device uses power; watt-hours are how much a battery holds. A slow sipper runs far longer on the same battery.
4 Does an oxygen concentrator need a bigger battery?
Generally yes — it draws much more than a CPAP and often runs far longer, so it usually needs more capacity and extra backup layers. Your supplier can confirm.
5 How much cushion should I add?
Enough for a comfortable margin against cold, battery age, and an extra device — roomy without being a burden to lift or afford.
6 Can you work out the size for me?
That's just what I do — read the labels, match them to a battery with headroom, and test the real runtime. $99 flat for a visit, 30-day come-back-free.
Would You Rather I Just Help?
Sizing a backup battery is bread-and-butter work for me, and I'm glad to do the arithmetic so you don't have to. Bring me your device labels and your supplier's recommended hours, and I'll match them to the right battery with room to spare. $99 flat for a visit, 30-day come-back-free.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).