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For loose cells and custom battery packs
click here:  For a chart of the sizes and weights of cylindrical batteries click
here:
For more battery engineering resources click here:
Custom design and manufacture of state-of-the-art battery chargers, UPS, and power supplies for
OEMs in a hurry!
Advantages:
 NiMH batteries are smaller and lighter than lead acid
batteries, making them a good choice for high performance bicycles and scooters.
Over 80% greater run time versus lead acid of the same
size.
Sustained operating voltage makes the scooter seem to have a fresh charge over most of the
operating time. Lead acid voltage sags continuously over the discharge curve making the scooter slower through most of the run
time.
Also available in custom
voltages, sizes, capacities, and configurations. This is PowerStream!
Low cost compared with
other NiMH manufacturers.
We set out to design a drop-in replacement for lead acid in personal electric vehicles. This
is a smaller, lighter, better performing replacement, but with a premium cost.
Data:
The following comparison tests were done with a 24 volt "Amplifier" electric
scooter:
| |
Lead Acid |
NiMH |
Improvement |
| Battery Format |
2 x 12V SLA Batteries |
20 x 1.2 V D cells |
|
| Rated Capacity |
8 AH |
8.5 AH |
|
| Battery Mass |
5.5 kg (12 lb) |
3.4 kg (7.5 lb) |
40 % lighter |
| Battery Size |
12 x 2.6 x 3.7 in. |
10.2 x 2.4 x 3.6 in. |
24% less volume |
| Maximum operating current (note 1) |
29.8 Amps |
30.1 Amps |
|
| Average Operating Current (note 1) |
11.1 Amps |
10.6 Amps |
|
Total run time
(note 4) |
27 minutes |
46 minutes |
70% longer |
Reduced Performance
(note 2) |
21 minutes |
35 minutes |
66% longer |
| Loss Performance (note 3) |
24 minutes |
45 minutes |
88% longer |
| Test differences |
Multiple rest cycles |
One rest cycle |
|
| Test differences |
Total run time includes three loss of power events with rests in between |
Test terminated upon the first loss of power |
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Notes:
1)156 lb test engineer on residential/business
area test course, almost constant slopes up and down.
2) Indicated time is the first instance of a
noticeable loss in performance.
3)
Indicated time is the first instance of a complete loss of performance
4) Total run time is greater than the loss of
performance time because the scooter was run again after a rest without
recharging.
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