(NiCd and NiMH)
|How should I prepare a new battery?
||Battery comes fully charged. Apply topping charge
||Charge 14–16h. Priming may be needed to format
||Apply a topping before use. No priming needed
|Can I damage
a battery with incorrect use?
|Yes, do not store partially charged, keep fully charged
||Battery is robust and the performance will improve with use
||Keep partially charged. Low charge can turn off protection circuit
|Do I need to apply a full charge?
||Yes, partial charge causes sulfation,
||Partial charge is fine
||Partial charge better than a full charge
|Can I disrupt the charge cycle?
||Yes, partial charge causes no harm
||Repeat charges can cause heat buildup
causes no harm
|Should I use up
all battery energy before charging?
|No, deep discharge wears battery down. Charge more often
||Apply scheduled discharges only to prevent memory
||Deep discharge wears the battery down
|Do I have to worry about “memory”?
||No, there is no memory
||Discharge NiCd every 1–3 months
|How do I calibrate a “smart” battery?
||Apply discharge/charge when the fuel gauge gets inaccurate. Repeat every 1–3 months
|Can I charge with the device on?
||Avoid load if possible
||Parasitic load can alter full-charge detection and overcharge battery or cause mini-cycles
|Do I remove the battery when full?
||Charger switches to float charge
||Remove after a few days in charger
||Not necessary; charger turns off
|How do I store
|Keep cells above 2.10V; charge
every 6 months
|Store in cool place; can be stored fully discharged
||Store in cool place partially charged
|Does battery heat up on charge?
||Lukewarm towards end of charge
||Warm but must cool down when ready
||Must stay cool or slightly warm
|How do I charge when cold?
||Slow charge (0.1): 0–45°C (32–113°F)
Fast charge (0.5–1C): 5–45°C (41–113°F)
|Do not charge
|Can I charge at hot temperatures?
||Lower threshold by 3mV/°C above 25°C
||Battery will not fully charge when hot
||Do not charge
above 50°C (122°F)
|What should I know about chargers?
||Charger should float at 2.25–2.30V/cell when ready
||Battery should not get too hot; should include temp sensor
||Battery must stay cool; no trickle charge when ready