rechargerable-battery-dat

charge time

Battery Type	Typical Charge Time	Notes
Lead-acid	8-12 hours	Slow charge time, can be faster with a fast charger.
LFP (Lithium Iron Phosphate)	2-4 hours	Similar to lithium-ion but may take slightly longer.
Lithium-ion (Li-ion)	1-3 hours	Fastest charging, especially with modern fast chargers.

Battery Type	Nominal Voltage	Capacity Range	Internal Resistance (New)	Internal Resistance After ~200 Cycles	Notes / Applications
AA NiMH	1.2V	1800–2500 mAh	20–50 mΩ	30–80 mΩ	Consumer electronics, toys
AAA NiMH	1.2V	600–1200 mAh	30–70 mΩ	40–100 mΩ	Small electronics, remote controls
18650 Li-ion	3.6–3.7V	2000–3500 mAh	30–80 mΩ	40–120 mΩ	Laptops, power banks, flashlights
High-drain 18650 Li-ion	3.6–3.7V	1500–3000 mAh	15–30 mΩ	25–50 mΩ	Power tools, e-cigarettes, high-current devices
26650 Li-ion	3.6–3.7V	4000–6000 mAh	10–40 mΩ	20–60 mΩ	High-capacity flashlights, e-bikes
12V Lead-Acid (SLA/AGM)	12V	7–20 Ah	0.12–0.3 Ω	0.15–0.4 Ω	Scooters, UPS, emergency lighting
12V LiFePO4	12.8V	10–20 Ah	5–20 mΩ	10–30 mΩ	E-bikes, solar storage, UPS
9V NiMH	8.4–9V	150–300 mAh	150–300 mΩ	200–400 mΩ	Smoke detectors, small electronics
NiCd AA	1.2V	600–1000 mAh	30–100 mΩ	50–150 mΩ	Older toys, cordless phones
LiPo (3.7V per cell)	3.7V	500–5000 mAh	20–100 mΩ	40–150 mΩ	Drones, RC cars, FPV drones

Internal resistance increases gradually with usage cycles and charging/discharging.
The amount of increase depends on:
- Battery chemistry and quality
- Depth of discharge and charging rate
- Temperature and storage conditions
Higher resistance results in lower peak current capability and slightly reduced capacity over time.