Convert mAh / Ah / Wh / kWh / J
API · /battery-api
Battery Calculator API
healthy
4,005 Subscribers
Battery and accumulator maths as an API, computed locally and deterministically from basic electrical relationships. The runtime endpoint estimates how long a battery will last under a given load — from the capacity (in mAh, Ah or Wh) and the load (in watts, or amps at a voltage), with adjustable depth-of-discharge and conversion efficiency — and reports the usable energy and the runtime in hours and minutes. The capacity endpoint converts a battery capacity between milliamp-hours, amp-hours, watt-hours, kilowatt-hours and joules at a given voltage. The pack endpoint builds a series/parallel cell pack (for example 3S2P): it returns the pack voltage, capacity and energy and the total cell count — series adds voltage, parallel adds capacity. The charge endpoint estimates the charge time from the capacity and the charge current (or a C-rate), with a charge efficiency and an optional from/to state-of-charge window. Everything is computed locally and deterministically, so it is instant and private. Real-world figures depend on temperature, age, C-rate and the discharge curve, so treat the results as estimates. Ideal for consumer-electronics and IoT tools, solar and off-grid sizing, drone and RC planning, UPS and backup-power sizing, and EV and battery-pack design. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is battery maths; for Ohm's-law voltage/current/resistance use an electronics API.
api.oanor.com/battery-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 82 ms
- Server probes · 24h
- Subscribers
- 4,005
- active
- Total calls
- 50
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 9,535 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 9,535 calls/month
- 2 req/sec
- Runtime + capacity + pack + charge
- No credit card
Starter
€11.05 /month
- 19,150 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 19.15k calls/month
- 8 req/sec
- mAh / Wh / J conversions
- Email support
Pro
€30.95 /month
- 241,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 241.5k calls/month
- 20 req/sec
- Solar / pack-design pipelines
- Priority support
Mega
€68.95 /month
- 1,250,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 1.25M calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
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api.oanor.com/sunrise-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Battery Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Battery Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Battery Calculator API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Battery Calculator API cost?
Battery Calculator API has a free tier with 100 calls / month. Paid plans start at €11.05 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Battery Calculator API GDPR-compliant?
All requests to Battery Calculator API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/battery-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/battery-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/battery-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/battery-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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