72v Li-Ion Charge Chart

	B	C	D	E	F	G	H	I	K	L	M	N	P	Q	T	U	W
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2	Volts	Charge %	Volts	Charge %	Volts	Charge %	Volts	Charge %	Cell Volts (corresponds to chart at left)				Charge % Calculation Method*		Quick Reference		Other Charge Charts
3	84.0	100	78.0	75	72.0	50	66.0	25	4.200	3.900	3.600	3.300	20 x [cell volts] = charge volts		%	Volts	Click Me
4	83.8	99	77.8	74	71.8	49	65.8	24	4.188	3.888	3.588	3.288			100	84.0
5	83.5	98	77.5	73	71.5	48	65.5	23	4.176	3.876	3.576	3.276	Voltage Increment		90	81.6
6	83.3	97	77.3	72	71.3	47	65.3	22	4.164	3.864	3.564	3.264		0.012v	80	79.2
7	83.0	96	77.0	71	71.0	46	65.0	21	4.152	3.852	3.552	3.252			70	76.8
8	82.8	95	76.8	70	70.8	45	64.8	20	4.140	3.840	3.540	3.240			60	74.4
9	82.6	94	76.6	69	70.6	44	64.6	19	4.134	3.828	3.528	3.228			50	72.0
10	82.3	93	76.3	68	70.3	43	64.3	18	4.116	3.816	3.516	3.216			40	69.6
11	82.1	92	76.1	67	70.1	42	64.1	17	4.104	3.804	3.504	3.204			30	67.2
12	81.8	91	75.8	66	69.8	41	63.8	16	4.092	3.792	3.492	3.192	*100% Charge Example Calc:		20	64.8
13	81.6	90	75.6	65	69.6	40	63.6	15	4.080	3.780	3.480	3.180	20 * 4.200 = 84.0v battery charge		10	62.4
14	81.4	89	75.4	64	69.4	39	63.4	14	4.068	3.768	3.468	3.168
15	81.1	88	75.1	63	69.1	38	63.1	13	4.056	3.756	3.456	3.156	- Cell is assumed to be a typical 18650 or 21700 with full charge at 4.2v and full discharge at 3.0v
16	80.9	87	74.9	62	68.9	37	62.9	12	4.044	3.744	3.444	3.144	- Calculation formula produces mathematically correct but real-world-ballpark values.
17	80.6	86	74.6	61	68.6	36	62.6	11	4.032	3.732	3.432	3.132		What does ballpark mean? Just because you have a 75% charge does not mean you have 75% of your total range
18	80.4	85	74.4	60	68.4	35	62.4	10	4.020	3.720	3.420	3.120		left before shutdown. Different batteries behave a bit differently as they discharge, So additionally Voltage X will
19	80.2	84	74.2	59	68.2	34	62.2	9	4.008	3.708	3.408	3.108		vary from Percentage Y by at least a bit. This chart only shows where you are on a 'perfect mathematical ' curve.
20	79.9	83	73.9	58	67.9	33	61.9	8	3.996	3.696	3.396	3.096		If you must, figure out yours for yourself thru experience with your pack - and re-factor and adjust as it ages.
21	79.7	82	73.7	57	67.7	32	61.7	7	3.984	3.684	3.384	3.084	- If you are serious about individualizing your chart to your own cells, start here (good luck)
22	79.4	81	73.4	56	67.4	31	61.4	6	3.972	3.672	3.372	3.072		http://lygte-info.dk/review/batteries2012/Common18650IndividualTest%20UK.html
23	79.2	80	73.2	55	67.2	30	61.2	5	3.960	3.660	3.360	3.060
24	79.0	79	73.0	54	67.0	29	61.0	4	3.948	3.648	3.348	3.048			Are you a programmer? Make your own damn chart:
25	78.7	78	72.7	53	66.7	28	60.7	3	3.936	3.636	3.336	3.036			counter% = 0 vCurrent% = 3.000 vIncrement% = 0.012 vPack% = 20 DIM vValue%(100) WHILE counter% < 101 vValue%(counter%) = vCurrent% * vPack% vCurrent% = vCurrent% + vIncrement% counter% = counter% + 1 WEND MEMORY
26	78.5	77	72.5	52	66.5	27	60.5	2	3.924	3.624	3.324	3.024
27	78.2	76	72.2	51	66.2	26	60.2	1	3.912	3.612	3.312	3.012
28							60.0	0				3.000
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30	Internet use: You can link to this page and post that link anywhere on the web.
31	Copies or screen shots: You can make copies only for your own use so long as they are never posted on the internet
32	SHARE REQUESTS: Want the Excel Source? Sorry there is none. I'm a programmer and used code similar to what I lay out in the 'make your own chart' box at right as well as the input cues in the Calculation Method box. Beyond that these charts were done manually. Which is not as much work as it seems as the voltages were done at different times over a couple of years before they were gathered together in the blog.
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