Battery Page

Flooded Battery Chart

Model	bat. volt.	Weight (lbs)	Pkrt's exp.	lngth	width	height	20 hour (ah)	rsrv cpcty	internal resistance	cost	cycles(80%)
SCS225	12	66	1.27				135	225		$85
DEKA 8G27	12	62.5	1.23
T-105	6	61	1.24	10.38	7.13	11.19	225	447	.004	$55	733
T-125	6	66	1.19	10.38	7.13	11.19	235	488	.0038	$80	650
T-145	6	71	1.14	10.38	7.13	11.5	244	530	.0036	$95	625
T-875	8	63	1.25	10.38	7.13	10.875	170	295	.008	$102
T-890	8	69	1.14	10.38	7.13	10.875	190	340	.0073	$122
US 8VGC	8	64.5	1.20	10.38	7.13	11.9	165	318	.0067	$50
5SHP	12	86	1.24	13.56	6.75	11.5	165	272		$220
Everready DC27-850	12	55	1.33	12.5	6.75	9.5	120	180		$55
Douglas 31EV	12	66	1.36	13	6.81	10.17	135	200

Sealed Battery Chart

Model	bat. volt.	Weight (lbs)	Pkrt's exp.	lngth	width	height	20 hr capacity	Reserve Capacity	internal resistance	cost	cycles(80%)
Hawker Cyclon BC	2	3.68	1.14	2.57	2.57	6.82	25.5 (10hr)	19.3 (1hr)	.0015
Hawker G26EP	12		1.08				26 (10hr)	21.7 (1hr)	.0045		400
Hawker G42EP	12	32.9	1.10	7.75	6.5	6.69	42 (10hr)	33.8 (1hr)	.0045		400
Hawker G70EP	12	58	1.10	13.02	6.62	7.68	71 (10hr)	57.4 (1hr)	.0035		400
Panasonic	12	46.2	1.13	15.3	4.6	6.9	74.7	140
Optima D750S	12	44.9	1.10	10.0	6.8	7.8	65	125		$130	220
Exide Orbital 34XCD	12	41	1.08	10.063	7	7.44	50		0.003	$98
Deka Intimidator 9A78DT	12	45	1.05	10.75	6.875	8	55	120		$102
Dynasty DCS50	12	40	1.20	8.06	5.31	8.54	46.9 (10hr)	32 (1hr)	0.006		600
Dynasty DCS75	12	54	1.19	10.17	6.65	8.67	71 (10hr)	49 (1hr)	0.0045		600
Dynasty DCS88L	12	64	1.21	11.95	6.85	9.05	81.4 (10hr)	54.3 (1hr)	0.0045		600
Dynasty DCS100L	12	69	1.20	12.34	6.53	9.48	90.8 (10hr)	61.5 (1hr)	0.0035	$215	600
Concorde GPC-1234	12	23	1.17	7.68	5.15	7.22	33	50		$58
Concorde GPC-1248	12	32	1.13	9.41	5.45	9.35	48	84		$85
Concorde GPC-1260	12	43	1.14	10.2	6.6	9.35	60	106		$102
Concorde GPC-1272	12	50	1.21	11.82	6.6	9.35	72	114		$114
Concorde GPC-1280	12	53	1.14	10.2	6.6	9.35	80	149		$118
Concorde GPC-1285	12	61	1.14				85	159		$138
Concorde GPC-1295	12	63	1.16	11.82	6.6	9.35	95	176		$152
Concorde GPC-12105	12	68	1.18	12.95	6.75	9.25	105	190		$166
Concorde GPC-4D	12	130	1.33	20.73	8.66	10.27	210	380		$301
Concorde GPC-8D	12	158	1.20	20.62	10.95	10.17	255	561		$376
Concorde GPC-6180	6	55	1.30	10.4	7.11	10.91	180	317		$145

NiMH Battery Chart

Model	bat. volt.	Weight (lbs)	Pkrt's exp.	lngth	width	height	20 hour (ah)	rsrv cpcty	cost	cycles(80%)
Ovonic (85ah)	12	35	1.18	16.1	3	4	112	200	$$	800
Powerstream QNF100 (100ah)	1.2	41.8		4.4	1.33	7.1	400A peak	300	$97 to 164	>800

Kokam LiPoly Battery Chart

Model	nom.voltage	Wt (lbs)	lngth	width	height	20 hour (ah)	IR (mOhms)	pk current (a)	cycles(80%)
SLPB 100216216	3.7	2.3	8.5	0.43	8.7	40	0.8	400	>500
SLPB 60460330	3.7	4.3	18	0.27	12.8	70	0.7	700	>500
SLPB 80460330	3.7	6.05	18	0.35	12.8	100	0.6	800	>500

Battery Frequently Asked Questions

What should I look for when deciding which battery to use?

You should be looking for a low Puekert's number when selecting batteries for you car. A high puekert's number means the battery will not last very long and will have a large voltage sag.
If I want to have a lot of range, which battery should I use?

Range depends on the weight of the batteries you have in your car, based on the percent of the total weight.
If I want to have an inexpensive low maintenance battery, which battery should I use?

I would suggest one of the concorde batteries as an inexpensive low maintenance battery. These batteries however can not take the abuse (high currents) that the optima or hawker batteries can.
If I want a high performance car, which battery should I use?

I would suggest the optima or hawker battery for a high performance car.
If I want an inexpensive moderate-low range car, which battery should I use?

I would suggest the T105 battery for an inexpensive moderate-low range car
If I want an inexpensive moderate range low voltage car, which battery should I use?

I would suggest the T105 or T125 battery for an inexpensive moderate range low voltage car.
Why is the Peukert's number important when deciding on a battery

The Peukert's number is important because it tells you the internal resistance of the battery. A battery may have a high 20 hour amp-hr rating, but a high Peukert's number. At the currents needed for EVs, this may not be a good battery because the amp-hr rating at a 1 hour rate or 1/2 hour rate can be a lot less then a battery with a lower 20 amp-hr lower Peukert's number. When deciding on a battery, use the calculator on this page to calculate the the 1 hour or 1/2 hour amp-hr rating. This will give a better indication of the range you can expect.
Are there any precuations which need to be taken for sealed batteries?

A sealed battery must not be over-charged. If you over-charge a sealed battery you will greatly shorten it's life by forcing the venting of water. You can use battery regulators to keep this from happening.
What is cell reversal?

Cell reversal is when a cell in the battery has the opposite value. This usually happens when a cell is charged in the incorrect direction as when the cell is completely discharged and current is still being drawn from the battery.
How do you fix a cell reversal?

How much current can I draw from the battery without damaging the battery?

This depends on the battery and how long you draw the high current. In general, the lower the Peukert's number the high the current you can draw from the battery without damaging the battery.
How do I charge my flooded batteries?

Charge batteries at what ever current until they reach 2.4 v per cell +/-.003v per degree C difference from 25 degrees. The higher the temerature the lower the voltage. Once the batteries reach 2.4v +/-, Keep the batteries at this voltage until the current goes to 2% of 20ah rating. So 120ah batteries should be charged until the current drops below 2.4 amps. Equalizing should be done about once a week when the batteries are new or very old, once a month during the normal life of the battery. To equalize, charge the batteries at 2% of 20ah rating until voltage stops rising. Make sure you keep track of the water level in the battery while equalizing. Equalizing will use water!