Description

 Ni-Cad

NiMH

 Lead-Acid

LibertyPak

 Memory Problems

 Yes

Yes

 Yes

None

 Low maintenance

 No

No

 No

Yes

Holds its charge (Shelflife)

 No (-20% per mo)

No (-50% per mo)

 Yes (-5% per mo))

Yes (-1% per mo)

High Temperature Performance

 Good

Good

 Fair

Excellent (144F )

 Cold Weather Performance

 Good

Good

 Poor

Excellent (-4F)

 Low internal resistance

 Yes

Yes

 No

Yes

 High Sustained Voltage

Yes

No

 No

Yes (4c)

 Fast Charge

 Yes

No

 No

Yes

 Terminal voltage per cell

 1.2 Volt

1.2 Volt

 2 Volt

4.2 Volt

 Operational in any position

 Yes

Yes

 Not Always

Yes

 Cycle life expectancy

up to 1000

up to 500

 up to 300

over 1000

Weight per 100 Watt-Hours

5 pounds

5 lbs

6 pounds

1.2 pounds

Environmentally Safe

No

Somewhat

No

Yes